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1
Pompei, Laura, Fabio Nardecchia et Adio Miliozzi. « Current, Projected Performance and Costs of Thermal Energy Storage ». Processes 11, no 3 (28 février 2023) : 729. http://dx.doi.org/10.3390/pr11030729.
Texte intégralRésumé :
The technology for storing thermal energy as sensible heat, latent heat, or thermochemical energy has greatly evolved in recent years, and it is expected to grow up to about 10.1 billion US dollars by 2027. A thermal energy storage (TES) system can significantly improve industrial energy efficiency and eliminate the need for additional energy supply in commercial and residential applications. This study is a first-of-its-kind specific review of the current projected performance and costs of thermal energy storage. This paper presents an overview of the main typologies of sensible heat (SH-TES), latent heat (LH-TES), and thermochemical energy (TCS) as well as their application in European countries. With regard to future challenges, the installation of TES systems in buildings is being implemented at a rate of 5%; cogeneration application with TES is attested to 10.2%; TES installation in the industry sector accounts for 5% of the final energy consumption. From the market perspective, the share of TES is expected to be dominated by SH-TES technologies due to their residential and industrial applications. With regard to the cost, the SH-TES system is typically more affordable than the LH-TES system or the TCS system because it consists of a simple tank containing the medium and the charging/discharging equipment.
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Paradise, S., S. Akopyan, R. C. De Baca, K. Croft, K. Fry, S. Gluck, D. Ho et al. « TES ground data system software ». IEEE Transactions on Geoscience and Remote Sensing 44, no 5 (mai 2006) : 1343–51. http://dx.doi.org/10.1109/tgrs.2006.871205.
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Daniarta, Sindu, Magdalena Nemś, Piotr Kolasiński et Michał Pomorski. « Sizing the Thermal Energy Storage Device Utilizing Phase Change Material (PCM) for Low-Temperature Organic Rankine Cycle Systems Employing Selected Hydrocarbons ». Energies 15, no 3 (28 janvier 2022) : 956. http://dx.doi.org/10.3390/en15030956.
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Thermal energy storage (TES) looks to be a promising technology for recovering waste heat or other intermittent heat sources, especially if it is coupled with the organic Rankine cycle (ORC) system. This system may use a variety of heat storage materials, including solids, liquids, and phase change materials (PCM). This article discusses the use of PCM as a thermal energy storage material in TES systems coupled with ORC systems. Other TES configurations may be used in ORC; however, in this article, the TES is solely used in heat exchangers, i.e., evaporator and liquid heater. The goal of this research is to establish a dimensionless storage mass parameter for sizing TES-evaporator (TES-EVA) or TES-liquid heater (TES-LH) devices for ORCs. Furthermore, the model of this system was created in the MATLAB environment using the chosen hydrocarbons as ORC working fluids. The obtained modelling results provide a novel point of view that scientists and engineers may employ while developing the TES-EVA or TES-LH utilizing PCM for ORC.
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Rezaie, Behnaz, Bale V. Reddy et Marc A. Rosen. « Exergy Assessment of a Solar-Assisted District Energy System ». Open Fuels & ; Energy Science Journal 11, no 1 (30 mars 2018) : 30–43. http://dx.doi.org/10.2174/1876973x01811010030.
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Background:District Energy (DE) is a technology capable of using renewable energy (e.g., solar thermal systems) and waste heat as energy sources efficiently. DE technology nonetheless has potential for improvement. Thermal Energy Storage (TES) can enhance DE performance significantly.Objective:An exergy analysis of a DE system which includes a solar thermal energy system and TES is performed, so as to improve understanding of its performance.Method:A case study based on the Friedrichshafen DE system in Germany is used to assess thermodynamically the role of solar energy and TES in a DE system. The system performance is separated into three modes: (1) fossil fuel is the only source of energy, (2) a discharging TES and fossil fuel provide heat for the DE system, and (3) solar energy and fossil fuels are the energy supplies. Exergy analyses are conducted for each performance mode and the overall DE system.Results:The results quantify the benefits of incorporating solar energy and TES on the performance of the Friedrichshafen DE system, and demonstrate that the overall exergy efficiency of the DE system increases from 23% to 27% with assistance of solar thermal collectors and TES, while the total energy efficiency increases from 83% to 87%.Conclusion:An increase of exergy efficiency is observed when TES is added to a DE system, due to a reduction in solar thermal energy loss by the TES, which allows more solar energy to be converted to useful energy to satisfy the DE system thermal energy demand.
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Qin, Jixin. « The Construction of a Diversified and Open Teacher Education System Management System That Integrates Public Mental Health ». Journal of Environmental and Public Health 2022 (17 août 2022) : 1–11. http://dx.doi.org/10.1155/2022/9269412.
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The teacher education management system is crucial to the operation of the teacher education system (TES). It is the core institutional system of the TES, which stipulates the management authority and functional scope of the relevant departments of the TES. After the new pluralistic and open TES is formed, the original management system must be adjusted accordingly. In this context, this article integrates public mental health (PMH) into the diversified and open management system of TES and then uses a neural network to evaluate and complete the following tasks: (1) this article introduces the development status of diversified and open TES management systems at home and abroad and the importance of public psychology courses to teacher education. (2) The framework of TES integrating PMH is proposed, and then the principles of BPNN and gray wolf optimization (GWO) algorithm are introduced, and the IGWO-BPNN model is constructed accordingly. (3) The convergence and fitness of the IGWO-BP model and the GWO-BP model are compared through experiments, which proves the superiority of the performance of the IGWO-BP model. The optimal model is constructed by selecting parameters, and then the output of the model is compared with the expert evaluation results, and the error is small. It is proved that the model has superior performance in evaluating the professional quality of teacher education. (4) This article selects three professional quality evaluation indicators of teacher education to compare the changes before and after the integration of PMH. The results show that the proposed diversified and open management system of TES integrating PMH can effectively improve the professional quality of teachers in all aspects.
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Eugene Chu, D. Tremblay, K. Croft et A. Griffin. « TES Science Investigator-led Processing System ». IEEE Transactions on Geoscience and Remote Sensing 44, no 5 (mai 2006) : 1352–58. http://dx.doi.org/10.1109/tgrs.2005.863713.
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Sadeghi, Samira, Girish Vallerinteavide Mavelli, Siddhesh Sujit Vaidya et Chester Lee Drum. « Gastrointestinal Tract Stabilized Protein Delivery Using Disulfide Thermostable Exoshell System ». International Journal of Molecular Sciences 23, no 17 (30 août 2022) : 9856. http://dx.doi.org/10.3390/ijms23179856.
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Thermostable exoshells (tES) are engineered proteinaceous nanoparticles used for the rapid encapsulation of therapeutic proteins/enzymes, whereby the nanoplatform protects the payload from proteases and other denaturants. Given the significance of oral delivery as the preferred model for drug administration, we structurally improved the stability of tES through multiple inter-subunit disulfide linkages that were initially absent in the parent molecule. The disulfide-linked tES, as compared to tES, significantly stabilized the activity of encapsulated horseradish peroxidase (HRP) at acidic pH and against the primary human digestive enzymes, pepsin, and trypsin. Furthermore, the disulfide-linked tES (DS-tES) exhibited significant intestinal permeability as evaluated using Caco2 cells. In vivo bioluminescence assay showed that encapsulated Renilla luciferase (rluc) was ~3 times more stable in mice compared to the free enzyme. DS-tES collected mice feces had ~100 times more active enzyme in comparison to the control (free enzyme) after 24 h of oral administration, demonstrating strong intestinal stability. Taken together, the in vitro and in vivo results demonstrate the potential of DS-tES for intraluminal and systemic oral drug delivery applications.
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Yasin, Aysar M. « The Impact of Dispatchability of Parabolic Trough CSP Plants over PV Power Plants in Palestinian Territories ». International Journal of Photoenergy 2019 (14 octobre 2019) : 1–14. http://dx.doi.org/10.1155/2019/4097852.
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This paper investigates the impacts of dispatchability of Parabolic Trough Concentrated Solar Power (PT-CSP) systems over PV power plants in Palestinian territories. Jericho governorate was taken as a case study. All conditions required for implementing PV and PT-CSP systems are verified. The capacity of each investigated system is 1 MW, and both systems are investigated in terms of technical, economic, and environmental aspects. The parametric analysis is used to identify the most feasible option of each renewable energy system by varying the cost of each option candidate and introducing thermal energy storage (TES) to the technology of PT-CSP systems with different capacities. A software based on the MATLAB environment is programmed to estimate the energy produced from each system with the important technical, financial, and environmental indicators. It is found that the alternative of installing a 1 MW PV system is the installation of 1 MWe PT-CSP systems with 14.5 h or 18.5 h TES. Introducing TES improves the dispatchability of the system and the capacity factor which consequently justifies the PT-CSP system investment. Increasing the degree of dispatchability improves the capacity factor of the PT-CSP system from 21% at 0 h TES to 57% at 18.5 h TES (24 h operation). The capacity factor of the PV system is 18.7% which is mostly similar to PT-CSP with zero dispatchability (0 h TES). The study considers the environmental benefits by estimating the amount of avoided CO2 emissions, and it was found that increasing the capacity factor augments the environmental benefits.
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Enescu, Diana, Gianfranco Chicco, Radu Porumb et George Seritan. « Thermal Energy Storage for Grid Applications : Current Status and Emerging Trends ». Energies 13, no 2 (10 janvier 2020) : 340. http://dx.doi.org/10.3390/en13020340.
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Thermal energy systems (TES) contribute to the on-going process that leads to higher integration among different energy systems, with the aim of reaching a cleaner, more flexible and sustainable use of the energy resources. This paper reviews the current literature that refers to the development and exploitation of TES-based solutions in systems connected to the electrical grid. These solutions facilitate the energy system integration to get additional flexibility for energy management, enable better use of variable renewable energy sources (RES), and contribute to the modernisation of the energy system infrastructures, the enhancement of the grid operation practices that include energy shifting, and the provision of cost-effective grid services. This paper offers a complementary view with respect to other reviews that deal with energy storage technologies, materials for TES applications, TES for buildings, and contributions of electrical energy storage for grid applications. The main aspects addressed are the characteristics, parameters and models of the TES systems, the deployment of TES in systems with variable RES, microgrids, and multi-energy networks, and the emerging trends for TES applications.
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Kolasiński, Piotr, et Sindu Daniarta. « Sizing the thermal energy storage (TES) device for organic Rankine cycle (ORC) power systems ». MATEC Web of Conferences 345 (2021) : 00018. http://dx.doi.org/10.1051/matecconf/202134500018.
Texte intégralRésumé :
Thermal energy storage (TES) became one of the main research topics in modern power engineering. The design of TES devices and systems depend on their application. Different thermal energy storage materials (e.g., solids, liquids, or phase change materials) can be applied in TES devices. The selection of the thermal energy storage material depends mainly on the thermal power and operating temperature range of the TES device. These devices and systems are applied in different energy conversion systems, including solar power plants or combined heat and power (CHP) stations. The application of TES devices is also considered in the case of other industries, such as metallurgy. The possible application of TES devices is particularly promising in the case of organic Rankine cycle (ORC) systems. These systems are often utilizing floating heat sources such as solar energy, waste heat, etc. TES device can be therefore applied as the evaporator of the ORC system in order to stabilize these fluctuations. In this paper, the possible thermal energy storage materials used in TES devices applied in ORCs are discussed. Moreover, the modelling results are reported related to assessment parameters which can be applied to size the TES device for ORC system utilizing different low-boiling working fluids. The thermal properties of working fluids are taken from CoolProp. The function of heat capacity of different TES materials is also provided and the calculation is computed by employing MATLAB. The result shows that based on the simulation, the gradient of the natural characteristic of TES with working fluids (ζ(Tb)) tends to decrease. The presented result in this paper gives a new point of view which can be used by scientists and engineers during the design and implementation of TES evaporators dedicated to ORC power systems.
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Gao, Xianhua, Shangshang Wei, Chunlin Xia et Yiguo Li. « Flexible Operation of Concentrating Solar Power Plant with Thermal Energy Storage Based on a Coordinated Control Strategy ». Energies 15, no 13 (5 juillet 2022) : 4929. http://dx.doi.org/10.3390/en15134929.
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With the ambition of achieving carbon neutrality worldwide, renewable energy is flourishing. However, due to the inherent uncertainties and intermittence, operation flexibility of controllable systems is critical to accommodate renewables. Existing studies mainly focus on improving the flexibility of conventional plants, while no attention has been paid to the flexible operation of concentrating solar power with thermal energy storage (CSP-TES) systems. To this end, the ultimate goal of this work is to investigate the potentiality and realization of CSP-TES systems to flexibly operate in grid system regulation. With this goal, the dynamic characteristics of a 50 MW parabolic trough collector CSP plant with molten-salt-based TES is analyzed, and its dominant control characteristics are concluded to demonstrate the possibility of the ideal. After that, a coordinated control strategy is proposed. Specifically, a disturbance observer-based feedforward–feedback control scheme and a feedforward–feedback controller are designed, respectively, for the solar field and the energy storage subsystems, while the power block subsystem is regulated by a two-input and two-output decoupled controller. Based on the decentralized structure, three simulation cases are, respectively, performed to testify the capacity of the CSP-TES system to wide-range load variation tracking, strong disturbance rejection, or both. The results show that the CSP-TES system can adequately track the grid commands based on the proposed coordinated control strategy, even under strong fluctuation of irradiation, demonstrating the flexibility of CSP-TES participating in grid regulation. In the context of continuous penetration of renewable energy into the grid system, research on the role transition of the CSP-TES system from its own optimization to grid regulator is of great importance.
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Hadijah, Sitti, Shalawati Shalawati et Andi Idayani. « Analisis Kemampuan Mahasiswa dalam Berkomunikasi secara Lisan pada Tes Simulasi IELTS (International English Language Testing System) ». GERAM 6, no 2 (20 décembre 2018) : 91–102. http://dx.doi.org/10.25299/geram.2018.vol6(2).2194.
Texte intégralRésumé :
IELTS (International English Language Testing System) merupakan salah satu tes kemahiran berbahasa Inggris yang megukur 4 keterampilan berbahasa Inggris seseorang. Terkait dengan adanya beberapa keterampilan berbahasa Inggris yang diukur di IELTS, penelitian ini berfokus pada penelitian berbicara (speaking) yang dilakukan oleh mahasiswa Program Studi Pendidikan Bahasa Inggris pada IELTS Simulation Test untuk menganalisa kemampuan mahasiswa dalam melakukan tes keterampilan berbicara, serta menemukan faktor-faktor yang mempengaruhi keberhasilan dan menjadi penghambat dalam melakukan tes simulasi yang diberikan. Hasil penelitian menunjukkan bahwa tingkat keterampilan mahasiswa dalam melakukan tes simulasi IELTS untuk keterampilan berbicara perlu untuk ditingkatkan lagi karena sebahagian besar mahasiswa masih berada pada rentang nilai 4-6. Sehingga, dapat dimaknai bahwa tingkat keterampilann mahasiswa dalam melakuan tes simulasi EITLS Speaking (Berbicara) sudah menunjukkan keterampilan yang cukup baik karena ada beberapa mahasiswa yang mampu meraih rentang nilai 7, dan sebahagian besar peserta tes juga sudah berada pada rentang 5-6, hanya beberapa mahasiswa yang berada pada rentang 4-4,5. Faktor latihan merupakan faktor utama yang mempengaruhi keberhasilan peserta tes untuk meningkatkan keterampilan mereka dalam berbicara Bahasa Inggris, namun seluruh mahasiswa yang diinterview mengemukakan bahwa mereka tidak melakukan persiapan khusus ketika mereka akan melakukan tes, sehinggan hasil yang mereka peroleh masih perlu untuk ditingkatkan. Selain itu, kecemasan pada saat melakukan tes berbicara mempengaruhi keterampilan peserta tes dalam menjawab pertanyaan yang diberikan, selain itu kesulitan peserta tes dalam memahami beberapa makna kata yang dituturkan oleh penguji menimbulkan kesulitan bagi peserta tes untuk merepon pertanyaan yang diajukan, namun mengetahui tips dan trik dalam melaukan tes IELTS Speaking dapat meminimalisir hal-hal yang dapat mengganggu selama pelaksanaan tes.
Kata Kunci : Berbicara, Tes Simulasi IELTS
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Kimura, Sumihisa, Satoshi Ueda, Saburo Murata, Yuji Tokunaga et Takehisa Hata. « Development of Time-Controlled Explosion System ( TES ). » membrane 20, no 4 (1995) : 263–69. http://dx.doi.org/10.5360/membrane.20.263.
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Schiefer, Ulrich, Jan Schiller, Roland Burth et Wolfgang Schnerring. « Tuebingen Education System (TES) - eine interaktive Falldemonstrationssoftware ». Klinische Monatsblätter für Augenheilkunde 219, no 8 (août 2002) : 597–601. http://dx.doi.org/10.1055/s-2002-34422.
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Iovane, G., L. Sensini, P. Di Gironimo, A. Rapuano et A. Briscione. « TES : Token evaluation system for blockchain contexts ». Journal of Interdisciplinary Mathematics 25, no 8 (17 novembre 2022) : 2093–111. http://dx.doi.org/10.1080/09720502.2021.1932852.
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Mao, Qianjun, Ning Liu et Li Peng. « Recent Investigations of Phase Change Materials Use in Solar Thermal Energy Storage System ». Advances in Materials Science and Engineering 2018 (12 décembre 2018) : 1–13. http://dx.doi.org/10.1155/2018/9410560.
Texte intégralRésumé :
Solar thermal energy storage (TES) is an efficient way to solve the conflict between unsteady input energy and steady output energy in concentrating solar power plant. The latent heat thermal energy storage (LHTES) system is a main method of storing thermal energy using phase change materials (PCMs). Thermal properties, that is, melting points and latent heat, are the key parameters of PCMs for the TES system. In this paper, the PCMs are classified into inorganic and organic by the chemical composition, and according to the melting point, the inorganic PCMs can be divided into three contributions: low-temperature heat storage (less than 120°C), medium-temperature heat storage (120–300°C), and high-temperature heat storage (more than 300°C). The present article focuses mainly on the recent investigations on the melting point and latent heat of PCMs via DSC setup in the solar TES systems. The results can provide a good reference for the selection and utilization of PCMs in the solar TES systems.
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Okello, Denis, Robinson Omony, Karidewa Nyeinga et Jimmy Chaciga. « Performance Analysis of Thermal Energy Storage System Integrated with a Cooking Unit ». Energies 15, no 23 (30 novembre 2022) : 9092. http://dx.doi.org/10.3390/en15239092.
Texte intégralRésumé :
This paper presents an experimental study on a single tank thermal energy storage (TES) system integrated with a cooking unit. The tank had a capacity of 45 L of oil. The cooking chamber was embedded in the storage tank, thereby eliminating the use of pumps and connecting pipes between the cooking unit and the storage unit. The system was designed to make good physical contact, circumferential and basally, with the cooking pot, to improve the rate of heat transfer. Experimental tests were performed with oil only and oil–rock pebbles as sensible heat storage materials. The charging unit was connected to the TES unit in such a way that it allowed circulation of oil between them during charging, using the thermosiphon principle. An electric heater rated at 800 W 240 V was inserted into the charging unit to charge the system. The thermal performance of the TES systems was evaluated in terms of the charging temperature, heat retention capacity, energy stored and cooking efficiency, and the overall heat lost coefficient. The results showed that the oil–rock system performed best, with a cooking efficiency of 64.9%, followed by the oil-only TES system, with 60.3%. Further tests on cooking indicated that the system was able to cook beans in 2.25 h and 2.0 h using the oil only and oil–rock pebbles thermal energy storage systems, respectively.
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Tan, Simon, et Andrew Wahlen. « Adiabatic Compressed Air Energy Storage : An analysis on the effect of thermal energy storage insulation thermal conductivity on round-trip efficiency ». PAM Review Energy Science & ; Technology 6 (24 mai 2019) : 56–72. http://dx.doi.org/10.5130/pamr.v6i0.1547.
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Compressed Air Energy Storage (CAES) has demonstrated promising potential for widescale use in the power distribution network, especially where renewables are concerned.Current plants are inefficient when compared to other technologies such as battery and pumped hydro. Presently, the greatest round-trip efficiency of any commercial CAES plant is 54% (McIntosh Plant), while the highest energy efficiency of any experimental plant is 66-70% (ADELE Project). So far, Adiabatic CAES systems have yielded promising results with round-trip efficiencies generally ranging between 65-75%, with some small-scale system models yielding round-trip efficiencies exceeding 90%. Thus far, minimal research has been devoted to analysing the thermodynamic effects of the thermal energy storage (TES) insulation. This metastudy identifies current industry and research trends pertaining to ACAES with a focus on the TES insulation supported by model simulations. Charged standby time and insulation of the TES on overall system efficiency was determined by performing a thermodynamic analysis of an ACAES system using packed bed heat exchangers (PBHE) for TES. The results provide insight into the effect various insulators, including concrete, glass wool and silica-aerogel, have on exergy loss in the TES and overall system efficiency. TES insulation should be carefully considered and selected according to the expected duration of fully charged standby time of the ACAES system.
Keywords: Compressed air energy storage; adiabatic compressed air energy storage; thermal energy storage; thermodynamic efficiency; renewable energy storage, packed bed heat exchanger
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Bartram, Peter, et Alexander Wittig. « Terrestrial exoplanet simulator : an error optimal planetary system integrator that permits close encounters ». Monthly Notices of the Royal Astronomical Society 504, no 1 (27 mars 2021) : 678–91. http://dx.doi.org/10.1093/mnras/stab896.
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ABSTRACT We present Terrestrial Exoplanet Simulator (tes), a new n-body integration code for the accurate and rapid propagation of planetary systems in the presence of close encounters. tes builds upon the classic Encke method and integrates only the perturbations to Keplerian trajectories to reduce both the error and runtime of simulations. Variable step size is used throughout to enable close encounters to be precisely handled. A suite of numerical improvements is presented that together make tes optimal in terms of energy error. Lower runtimes are found in the majority of test problems considered when compared to direct integration using ias15. tes is freely available.
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Whitcraft, Dan, Kenneth T. Sullivan, Anusree Saseendran et Jake Smithwick. « Case Study of Load Shifting Using Thermal Energy Ice Storage in Public Facilities ». Journal of Facility Management Education and Research 1, no 2 (1 janvier 2017) : 67–71. http://dx.doi.org/10.22361/jfmer/81612.
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ABSTRACT Energy management is becoming increasingly important in the building sector due to the fact that it accounts for 50% of total energy consumption in industrial nations. The objective of this study was to compare a partial thermal energy storage system and a traditional air-cooled chiller system in a building retrofit in Alachua County, Florida in order to identify energy and cost savings and to quantify those savings. Initial costs, maintenance costs, energy consumption and utility rates were used to draw comparisons between the two systems. Findings include annual utility costs and annual operating costs for the two systems, and their simple payback period. The Thermal Energy System (TES) was found to be more beneficial in the long run, despite its higher cost of installation. Practical implications of implementing an advanced system such as TES are discussed to better prepare building professionals considering TES.
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Congedo, Paolo Maria, Cristina Baglivo, Simone Panico, Domenico Mazzeo et Nicoletta Matera. « Optimization of Micro-CAES and TES Systems for Trigeneration ». Energies 15, no 17 (26 août 2022) : 6232. http://dx.doi.org/10.3390/en15176232.
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Energy storage makes energy continuously available, programmable, and at power levels different from the original intensity. This study investigates the feasibility of compressed-air energy storage (CAES) systems on a small scale. In addition to the CAES systems, there are two TES (thermal energy storage) systems for the recovery of calories and frigories. The micro-CAES + TES system is designed for a single-family residential building equipped with a photovoltaic system with a nominal power of 3 kW. The system is optimized as a potential alternative to battery storage for a typical domestic photovoltaic system. The multi-objective optimization analysis is carried out with the modeFRONTIER software. Once the best configuration of the micro-CAES + TES system is identified, it is compared with electrochemical storage systems, considering costs, durability, and performance. The efficiency of CAES (8.4%) is almost one-tenth of the efficiency of the most efficient batteries on the market (70–90%). Its discharge times are also extremely short. It is shown that the advantages offered by the application of mechanical accumulation on a small scale are mainly related to the exploitation of the thermal waste of the process and the estimated useful life compared to the batteries currently on the market. The studied system proves to be non-competitive compared to batteries because of its minimal efficiency and high cost.
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Jin, Baohong, Zhichao Liu et Yichuan Liao. « Exploring the Impact of Regional Integrated Energy Systems Performance by Energy Storage Devices Based on a Bi-Level Dynamic Optimization Model ». Energies 16, no 6 (10 mars 2023) : 2629. http://dx.doi.org/10.3390/en16062629.
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In the context of energy transformation, the importance of energy storage devices in regional integrated energy systems (RIESs) is becoming increasingly prominent. To explore the impact of energy storage devices on the design and operation of RIESs, this paper first establishes a bi-level dynamic optimization model with the total system cost as the optimization objective. The optimization model is used to optimize the design of three RIESs with different energy storage devices, including System 1 without an energy storage device, System 2 with a thermal energy storage (TES) device, and System 3 with TES and electrical energy storage (EES) devices. According to the design and operation results, the impact of energy storage devices on the operational performance of RIESs is analyzed. The results show that under the design conditions, energy storage devices can significantly increase the capacity of the combined heating and power units and absorption chillers in System 2 and System 3 and reduce the capacity of the ground source heat pumps and gas boilers; the impact of the TES device on System 3 is more significant. Affected by systems’ configuration, the operating cost, carbon tax, and total cost of System 2 are reduced by 2.9%, 5.5%, and 1.5% compared with System 1, respectively. The EES device can more significantly reduce the operating cost of System 3, with a reduced rate of 5.7% compared with that in System 1. However, the higher equipment cost makes the total cost reduction rate of System 3 less than that of System 1, which is 1.75%. Similar to the design conditions, under the operation conditions, the TES device can effectively reduce the carbon tax, operating cost, and total cost of System 2, while System 3 with an EES device can significantly reduce its operating cost regardless of whether the energy price changes or not. To some extent, this study systematically elucidated the impact of TES and EES devices on the optimal design and operation performance of RIESs and provided a certain reference for the configuration of energy storage devices.
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Coccia, Gianluca, Alessia Aquilanti, Sebastiano Tomassetti, Pio Francesco Muciaccia et Giovanni Di Nicola. « Experimental Analysis of Nucleation Triggering in a Thermal Energy Storage Based on Xylitol Used in a Portable Solar Box Cooker ». Energies 14, no 18 (21 septembre 2021) : 5981. http://dx.doi.org/10.3390/en14185981.
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Sugar alcohols have interesting thermodynamic properties that make them good options as heat storage materials (HSMs) to be used in solar cookers. Among sugar alcohols, xylitol is affected by severe supercooling that can significantly alter its usefulness in thermal energy storage (TES) systems. To overcome the supercooling issue, in this work the thermal behavior of a xylitol-based TES installed in a portable solar box cooker was investigated experimentally. The solar cooker has a 4.08 concentration ratio and the TES is a double-pot system filled with 2.5 kg of commercial-grade xylitol. The TES includes a manual mixing device that can be used to trigger the nucleation of xylitol. The effectiveness of the TES system with and without triggering was assessed through several outdoor tests, divided into heating and cooling phases, using silicone oil as absorbing media. It was found that the average load cooling time, in the temperature range of the test fluid from 110 to 80 °C, increased by about 346% when the solar cooker was equipped with the xylitol-triggered TES. The mixing device can therefore be considered an effective solution for regarding xylitol as an actual and performing phase change material.
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Zhang, Ruoyu, Haichao Wang, Xiaozhou Wu, Xiangli Li et Lin Duanmu. « The application of the TES technology in CHP heating system with Chinese demand profiles——A techno-economic feasibility case study ». E3S Web of Conferences 111 (2019) : 06010. http://dx.doi.org/10.1051/e3sconf/201911106010.
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The thermal energy storage (TES) technology is an effective method to enhance the planning and the economy of the combined heat and power (CHP) plants, while it has still not been broadly promoted in China. In this paper we firstly establish a mathematical model for a Chinese CHP plant with TES. Then the EnergyPRO software is used to find the optimum type of the TES tank in a three-tariff electricity pricing market and the operation strategy of the CHP plant with the selected TES tank is studied. Thirdly, the economic benefits of the system with/without TES is evaluated. The results show that adding a TES tank with volume of 24000m3 can significantly increase operational profits of the CHP system and reduce the use of peak-shaving heat source.
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Zwierzchowski, Ryszard, Olgierd Niemyjski et Marcin Wołowicz. « Energy Savings Analysis for Operation of Steam Cushion System for Sensible Thermal Energy Storages ». Energies 15, no 1 (1 janvier 2022) : 286. http://dx.doi.org/10.3390/en15010286.
Texte intégralRésumé :
The paper presents an analytical discussion of how to improve the energy efficiency of the steam cushion system operation for a Thermal Energy Storage (TES) tank. The EU’s green deal 2050 target policy requires an increase in the energy efficiency of energy production and use, as well as an increase in the share of renewable energy in the overall energy production balance. The use of energy-efficient TES is considered as one of the most important technologies to achieve the objectives of this EU policy. The analyses presented in the paper of energy-efficient operation of steam cushion (SC) systems were carried out by using operational data received from three District Heating Systems (DHSs) that supply heat and electricity to one of the largest cities in Poland and are equipped with the TES systems. These three analyzed TESs differ in capacities from 12,800 to 30,400 m3, tank diameters from 21 to 30 m and shell height from 37 to 48.2 m. The main purpose of using a steam cushion system in the TES tank is to protect the water stored in it against the absorption of oxygen from the surrounding atmospheric air through the surge chamber and safety valves located on the roof of the tank. The technical solutions presented here for the upper orifice for charging and discharging hot water into/from the tank and the suction pipe for circulating water allow to us achieve significant energy savings in the steam cushion systems. Both the upper orifice and the end of suction pipe are movable through the use of pontoons. Thanks to the use of this technical solution, a stable insulating water layer is created above the upper orifice in the upper part of the TES tank, where convective and turbulent transport of heat from the steam cushion space to the hot water stored in the tank is significantly limited. Ultimately, this reduces the heat flux by approximately 90% when compared to the classic technical solutions of steam cushion systems in TES tanks, i.e., for the upper orifice and circulation water pipe. The simplified analysis presented in the paper and comparison of its results with experimental data for heat flow from the steam cushion space to hot water stored in the upper part of the TES tank fully confirms the usefulness of the heat-flow models used.
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Aziz, Nursyazwani Abdul, Nasrul Amri Mohd Amin, Mohd Shukry Abd Majid et Izzudin Zaman. « Thermal energy storage (TES) technology for active and passive cooling in buildings : A Review ». MATEC Web of Conferences 225 (2018) : 03022. http://dx.doi.org/10.1051/matecconf/201822503022.
Texte intégralRésumé :
Thermal energy storage (TES) system is one of the outstanding technologies available contributes for achieving sustainable energy demand. The energy storage system has been proven capable of narrowing down the energy mismatch between energy supply and demand. The thermal energy storage (TES) - buildings integration is expected to minimize the energy demand shortage and also offers for better energy management in building sector. This paper presents a state of art of the active and passive TES technologies integrated in the building sector. The integration method, advantages and disadvantages of both techniques were discussed. The TES for low energy building is inevitably needed. This study prescribes that the integration of TES system for both active and passive cooling techniques are proven to be beneficial towards a better energy management in buildings.
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Kussul, Ernst, Tetyana Baydyk, Airam Curtidor et Graciela Velasco Herrera. « MODELING A SYSTEM WITH SOLAR CONCENTRATORS AND THERMAL ENERGY STORAGE ». Problems of Information Society 14, no 2 (5 juillet 2023) : 15–23. http://dx.doi.org/10.25045/jpis.v14.i2.02.
Texte intégralRésumé :
Global climate change, which has upset the ecological balance, and the rate of population growth, causing an increase in the demand for electricity in the world, are accelerating the gradual transition of states to green energy. Energy generation and energy storage are two important elements in green energy systems. We select parabolic solar concentrators as instrument for energy generation and develop flat facet solar concentrators that approximate a parabolic shape surface. Not only the structure of solar concentrators is proposed, but also the structure of thermal energy storage is described and presented. Using our solar concentrators, small-scale thermal energy storage (TES), it is possible to make power plants for green buildings. Small solar power plants and the air dehumidification system based on solar concentrators have great practical potential, can provide all the energy needs of smart residential buildings in countries with a hot climate, regulate air humidity, improve agricultural productivity in mountainous areas, etc. We describe a small-scale TES and the heater based on a solar concentrator. Water can be used to transfer heat energy. Another variant of TES is based on grave. We describe not only the structure of the system with parabolic solar concentrator and TES but calculate their parameters.
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Reddy, R. Meenakshi, N. Nallusamy et K. Hemachandra Reddy. « The Effect of PCM Capsule Material on the Thermal Energy Storage System Performance ». ISRN Renewable Energy 2014 (21 janvier 2014) : 1–6. http://dx.doi.org/10.1155/2014/529280.
Texte intégralRésumé :
Phase change material (PCM) based thermal energy storage (TES) systems are gaining increasing importance in recent years in order to reduce the gap between energy supply and demand in solar thermal applications. The present work investigates the effect of PCM capsule material on the performance of TES system during charging and discharging processes. The TES unit contains paraffin as PCM filled in spherical capsules and is integrated with flat plate solar collector. Water is used as sensible heat material as well as heat transfer fluid (HTF). The PCM capsules are of 68 mm diameter and are made using three different materials, namely, (i) high density polyethylene (HDPE), (ii) aluminum (Al), and (iii) mild steel (MS). The experimental investigation showed that the charging and recovery of stored energy are less affected by the spherical capsules material. The variables, like charging time and discharging quantity, are varied around 5% for the different capsule materials. Even though aluminum thermal conductivity is much higher than HDPE and mild steel, its influence on the performance of TES system is very low due to the very high internal heat resistance of PCM material stored in the spherical capsules.
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Manusilp, Kebsiri, et David Banjerdpongchai. « Optimal Dispatch Strategy of Cogeneration with Thermal Energy Storage for Building Energy Management System ». ECTI Transactions on Computer and Information Technology (ECTI-CIT) 10, no 2 (6 mars 2017) : 156–66. http://dx.doi.org/10.37936/ecti-cit.2016102.64847.
Texte intégralRésumé :
This paper presents optimal dispatch strategy of cogeneration with thermal energy storage (TES) for building energy management system (BEMS). In previous research related to cogeneration as a supply system, it is observed that there is some excessive heat from cogeneration operation released to the atmosphere. In order to improve energy efficiency, we therefore incorporate TES to utilize the excessive heat from cogeneration into two objective functions, i.e., total operating cost (TOC) and total carbon dioxide emission (TCOE). In particular, we aim to minimize TOC which is referred to economic optimal operation and to minimize TCOE which is referred to environmental optimal operation. Both optimal operations are subjected to energy dispatch strategy which TES constraint is taken into account. We demonstrate the dispatch strategy with a load profile of a large shopping mall as a test system and compare the results to that of previous dispatch of cogeneration without TES. The proposed strategy of cogeneration with TES can reduce TOC of the test system up to 4.15% and 1.85% for economic and environmental optimal operations, respectively. Furthermore, TCOE can be reduced up to 5.25% and 6.25% for economic and environmental optimal operations, respectively.
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Frazzica, Andrea, Valeria Palomba et Angelo Freni. « Development and Experimental Characterization of an Innovative Tank-in-Tank Hybrid Sensible–Latent Thermal Energy Storage System ». Energies 16, no 4 (14 février 2023) : 1875. http://dx.doi.org/10.3390/en16041875.
Texte intégralRésumé :
This study focuses on the development and testing under lab-controlled conditions of a hybrid sensible–latent thermal energy storage (TES) system for domestic hot water (DHW) provision in residential buildings. The TES system’s design is based, for the first time in the literature, on a commercial tank-in-tank architecture integrating a macro-encapsulated commercial phase change material (PCM) inside the external tank to guarantee the safe provision of DHW and increase overall energy storage density at a reasonable cost. The PCM is a salt hydrate with a nominal melting temperature of 58 °C. The overall tank-in-tank TES volume is about 540 dm3. Almost one tenth of this volume is occupied by the PCM macro-capsules. The developed TES system was comparatively tested against the same configuration operated as a sensible TES. The obtained results showed the ability of the PCM to increase the thermal inertia inside the external tank, thus guaranteeing the quite stable provision of heat to the integral DHW tank during the stand-by periods. This effect was confirmed by the PCM’s ability to achieve an energy storage capacity up to 16% higher than the reference sensible TES system.
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Amin, N. A. M., Azizul Mohamad, R. Daud, M. S. Abdul Majid, Mohd Afendi, Frank Bruno et Martin Belusko. « CFD Model Validation for Charging and Discharging of a PCM Encapsulated in Sphere ». Applied Mechanics and Materials 699 (novembre 2014) : 300–304. http://dx.doi.org/10.4028/www.scientific.net/amm.699.300.
Texte intégralRésumé :
The application of phase change material (PCM) for thermal energy storage (TES) has become one of the viable solutions in energy saving achievable with renewable thermal systems. Packed bed of spheres has been used as TES to enlighten the encapsulated PCM availability in space within the TES system. In order to minimise the high manufacturing cost, the simulation on the TES model is proposed. In accordance to that, a model of TES containing a PCM sphere has been studied in this paper. A commercialised computational fluid dynamics (CFD) software is used to simulate the TES model and the result is then compared experimentally, thus validating the simulation model. The model has been validated for both charging and discharging processes. It is also found that with the use of the CFD model, one could determine the effective thermal conductivity of the PCM at different temperatures.
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Ulinuha, Amrullah, et Yudie Irawan. « Content Management System (CMS) Untuk Tes Online Mahasiswa Baru Pada Universitas Muria Kudus ». Simetris : Jurnal Teknik Mesin, Elektro dan Ilmu Komputer 4, no 1 (6 avril 2014) : 11. http://dx.doi.org/10.24176/simet.v4i1.120.
Texte intégralRésumé :
ABSTRAK Teknologi internet dewasa ini telah banyak digunakan dalam berbagai kepentingan. Semenjak internet mudah diakses melalui modem yang murah dan telepon genggam, maka internet bukan lagi menjadi hal yang asing bagi masyarakat. Perkembangan jumlah pengguna internet tersebut dapat dijadikan ukuran bahwa masyarakat telah siap untuk berinteraksi dengan aplikasi berbasis web. Hal ini melatarbelakangi Universitas Muria Kudus untuk mulai menerapkan Tes Online bagi calon mahasiswa baru. Penelitian ini mengangkat Content Management System sebagai wadah dalam mengembangkan aplikasi tes online. Metode pengembangan sistem yang digunakan dalam penelitian ini adalah Waterfall Model. Metode perancangan perangkat lunak yang digunakan dalam penelitian ini adalah Unified Modelling Language, sedangkan perancangan basis data masih menggunakan Entity Relationship Diagram (ERD). Pengembangan program dalam penelitian ini menggunakan pemrograman Hypertext Preprocessor (PHP) database MySQL sebagai penyimpan data. Hasil dari penelitian ini adalah situs "tes online" yang menitikberatkan pada manajemen konten dan penambahan pengelolaan tes. Sebagai tambahan, website ini dapat digunakan oleh universitas lain Kata Kunci : Sistem Aplikasi, Content Management System, Test, Online, Universitas Muria Kudus
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Vasta, Salvatore, Vincenza Brancato, Davide La Rosa, Valeria Palomba, Giovanni Restuccia, Alessio Sapienza et Andrea Frazzica. « Adsorption Heat Storage : State-of-the-Art and Future Perspectives ». Nanomaterials 8, no 7 (12 juillet 2018) : 522. http://dx.doi.org/10.3390/nano8070522.
Texte intégralRésumé :
Thermal energy storage (TES) is a key technology to enhance the efficiency of energy systems as well as to increase the share of renewable energies. In this context, the present paper reports a literature review of the recent advancement in the field of adsorption TES systems. After an initial introduction concerning different heat storage technologies, the working principle of the adsorption TES is explained and compared to other technologies. Subsequently, promising features and critical issues at a material, component and system level are deeply analyzed and the ongoing activities to make this technology ready for marketing are introduced.
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Zwierzchowski, Ryszard. « Improvement of operation of steam cushion system for sensible thermal energy storage ». E3S Web of Conferences 116 (2019) : 00107. http://dx.doi.org/10.1051/e3sconf/201911600107.
Texte intégralRésumé :
The paper contains a method for improvement of operation of steam cushion system including its energy savings analyses, for a Thermal Energy Storage (TES) tank. Energy savings analyses were performed using operational data from selected Combined Heat and Power plants, which supply heat to large cities in Poland and are furnished with the TES. The role of the steam cushion system in the TES tank is to prevent the stored water against absorbing oxygen from atmospheric air. In the TES tank, which is a non-pressure tank, oxygen from atmospheric air could penetrate to the network water through the surge chamber and safety valves. The steam pressure under the roof is generated from technological steam injected under the roof. Energy savings in the steam cushion system are generated by using an appropriate technical solution for the upper orifice and suction pipe for circulation water, i.e., to make it movable through the use of pontoons. An isolating buffer layer is created at the top of the tank with very small convective and turbulent heat transport, which causes limited heat transfer from steam bed to the stored water in the tank. This results in heat flux of approximately 10% of the heat flux that occurs in the typical technical solution of the upper orifice and suction pipe for circulation water in the TES tank. This technology offers great opportunities to improve the operating conditions of District Heating System, cutting energy production costs and emissions of pollutants to the atmosphere.
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Rizza, J. J. « Aqueous Lithium Bromide TES and R-123 Chiller in Series ». Journal of Solar Energy Engineering 125, no 1 (27 janvier 2003) : 49–54. http://dx.doi.org/10.1115/1.1530630.
Texte intégralRésumé :
This paper presents an analysis of a cold thermal energy storage (TES) system operating in series with an R-123 chiller. A lithium bromide/water LiBr/H2O solution is used both as a refrigerant and as a cold thermal storage material. The refrigerant, liquid water, is extracted from the LiBr/H2O strong solution during the off-peak period. The liquid water and LiBr/H2O weak solution, a byproduct of the refrigerant recovery process, are used during the on-peak period to cool the building. Building waste heat is pumped by the R-123 compressor to a higher temperature during the off-peak period and is used in the generator to recover the thermal storage by reprocessing the stored solution to a higher lithium bromide concentration. The storage volumetric efficiency and system COP are determined and compared to storage systems based on water/ice and liquid water. The storage volumetric efficiency is greater than a water/ice system and far exceeds the value for a liquid water system. The proposed system, which uses an external heat pump as a source of generator heat, is also compared to another LiBr/H2O system that uses a self-contained internal heat pump (the compressor operates independently from the chiller and uses the liberated water refrigerant as its working fluid). The system presented here outperforms both the water/ice system and the internal heat pump LiBr/H2O system but is unable to match the liquid water system COP. However, it has other well-defined advantages over the liquid water system and appears to be a competitive alternative to conventional TES systems.
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Lin, Hanjun, Yeh-Liang Hsu, Ming-Shinn Hsu et Chih-Ming Cheng. « Development and Practice of a Telehealthcare Expert System (TES) ». Telemedicine and e-Health 19, no 7 (juillet 2013) : 549–56. http://dx.doi.org/10.1089/tmj.2012.0190.
Texte intégral
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Sultan, Sara, Jason Hirschey, Navin Kumar, Borui Cui, Xiaobing Liu, Tim J. LaClair et Kyle R. Gluesenkamp. « Techno-Economic Assessment of Residential Heat Pump Integrated with Thermal Energy Storage ». Energies 16, no 10 (14 mai 2023) : 4087. http://dx.doi.org/10.3390/en16104087.
Texte intégralRésumé :
Phase change material (PCM)-based thermal energy storage (TES) can provide energy and cost savings and peak demand reduction benefits for grid-interactive residential buildings. Researchers established that these benefits vary greatly depending on the PCM phase change temperature (PCT), total TES storage capacity, system configuration and location and climate of the building. In this study, preliminary techno-economic performance is reported for a novel heat pump (HP)-integrated TES system using an idealized approach. A simplified HP-TES was modeled for 1 year of space heating and cooling loads for a residential building in three different climates in the United States. The vapor compression system of the HP was modified to integrate with TES, and all heat transfer to and from the TES was mediated by the HP. A single PCM was used for heating and cooling, and the PCT and TES capacity were varied to observe their effects on the building’s energy consumption, peak load shifting and cost savings. The maximum reduction in electric consumption, utility cost and peak electric demand were achieved at a PCT of 30 °C for New York City and 20 °C for Houston and Birmingham. Peak energy consumption in Houston, New York City, and Birmingham was reduced by 47%, 53%, and 70%, respectively, by shifting peak load using a time-of-use utility schedule. TES with 170 MJ storage capacity allowed for maximum demand shift from on-peak to off-peak hours, with diminishing returns once the TES capacity equaled the daily building thermal loads experienced during the most extreme ambient conditions.
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Rucevskis, Sandris, Pavel Akishin et Aleksandrs Korjakins. « Performance Evaluation of an Active PCM Thermal Energy Storage System for Space Cooling in Residential Buildings ». Environmental and Climate Technologies 23, no 2 (1 novembre 2019) : 74–89. http://dx.doi.org/10.2478/rtuect-2019-0056.
Texte intégralRésumé :
Abstract This paper presents a numerical simulation-based study that evaluates the potential of an active phase change material (PCM) incorporated thermal energy storage (TES) system for space cooling in residential buildings. In the proposed concept, TES system is composed of stand-alone PCM storage units which are installed between the concrete ceiling slab and the ceiling finishing layer. Active control of the thermal energy storage is achieved by night cooling of a phase change material by means of cold water flowing within a capillary pipe system. Effectiveness of the system under the typical summer conditions of the Baltic States is analysed by using computational fluid dynamics (CFD) software Ansys Fluent. Results showed that installation of the active TES system has a positive effect on thermal comfort, reducing the average indoor air temperature by 6.8 °C. The outcome of this investigation would be helpful in selecting the key characteristics of the system in order to achieve the optimum performance of an active TES system for space cooling of buildings in similar climates.
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Endra Dewatama. « Tsunami Hazard Mapping and Loss Estimation in Yogyakarta International Airport Area ». Built Environment Studies 2, no 1 (30 avril 2021) : 1–11. http://dx.doi.org/10.22146/best.v2i1.535.
Texte intégralRésumé :
Yogyakarta International Airport and Temon District in Regency of West Progo are located on the southern coast of Java island with the potential for tsunami disaster. The BNPB (National Agency for Disaster Relief) data along the southern coast of Java is a high priority region with high tsunami risk. This study aims to predict and analyze tsunami disasters with a height of 15 meters and 20 meters. To show the element of risk exposed using the overlay technique with a tabulated system using GIS software (Autocad and Global Mapper) to map the affected map. With a total area of study of 5,872 hectares in the 15-meter-wide scenario of the area reaching 2,836 hectares in 12 villages, the 206-hectare 206-acre scenario covers 14 villages. For the physical aspect, the 15-meter scenario is located at 6517 dilapidated buildings and the 20-meter scenario is at 9697 buildings. For the social aspect, there are 281,345 people for the 15-meter scenario and 295,554 for the 20-meter scenario. For TES Evacuation (TEA Evacuation Station) and TEA (Final Evacuation Station), for TES a total of 19 points that are TES based at Aerotropolis and TEA are on a hillside 4 kilometers from the coastline.
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Ohgaki, Masataka, Keiichi Tanaka, Hidekazu Suzuki, Masakatsu Hasuda, Syo Matsumura, Masato Yano et Masaru Miyayama. « SEM-TES Application to Chemical State Analysis on Cation of Electrode Materials for Electrochemical Capacitors Based on the Sensitivity Correction of X-Ray Intensity Data ». Key Engineering Materials 617 (juin 2014) : 94–97. http://dx.doi.org/10.4028/www.scientific.net/kem.617.94.
Texte intégralRésumé :
The microcalorimeter detects the energy of incidentX-ray photon by the slight temperature rise of a device at a very low temperature, and the detector of a superconducting transition-edge sensor (TES) microcalorimeter has been developed for the measurement of energy dispersive X-ray photons of the energy of 10 to 20 keV with the energy resolution better than 100 eV of FWHM value by having the counting rate over 100 counts per second. A FE-SEM with a detector of TES microcalorimeter (SEM-TES) has already been developed for the extra-high resolution energy-dispersive X-ray spectrometry system to apply in electron-microprobe chemical analyses. Recently, we developed the sensitive correct function on the observed X-ray intensity data measured in the system. Then, the high energy resolution of revised SEM-TES system is precisely able to determine the element contents on the sample. In addition, the chemical bonding states can be clarified by the fluorescent X-ray intensities in the lower energy region derived with a low accelerating voltage of SEM-TES system. We applied the revised SEM-TES system to analyze chemical state on the electrode of nanosheets-derived Hx(Ni1/3Co1/3Mn1/3)O2 for newly developing electrochemical capacitors. We investigated the chemicalstate of cations by not the M-lines but the L-beta and L-alpha lines as the lower energy lines having relative large contribution on chemical bonding. As a result, we revealed a specific chemical state of the Mn different from that of Li(Ni1/3Co1/3Mn1/3)O2 electrode in LiB, that was supported by the result of TEM-EELS analysis. These results show that the SEM-TES system can be a useful analytical tool for the chemical bonding state and electronic structure determinations in a wide range of materials.
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Anagnostis, Athanasios, Serafeim Moustakidis, Elpiniki Papageorgiou et Dionysis Bochtis. « A Hybrid Bimodal LSTM Architecture for Cascading Thermal Energy Storage Modelling ». Energies 15, no 6 (8 mars 2022) : 1959. http://dx.doi.org/10.3390/en15061959.
Texte intégralRésumé :
Modelling of thermal energy storage (TES) systems is a complex process that requires the development of sophisticated computational tools for numerical simulation and optimization. Until recently, most modelling approaches relied on analytical methods based on equations of the physical processes that govern TES systems’ operations, producing high-accuracy and interpretable results. The present study tackles the problem of modelling the temperature dynamics of a TES plant by exploring the advantages and limitations of an alternative data-driven approach. A hybrid bimodal LSTM (H2M-LSTM) architecture is proposed to model the temperature dynamics of different TES components, by utilizing multiple temperature readings in both forward and bidirectional fashion for fine-tuning the predictions. Initially, a selection of methods was employed to model the temperature dynamics of individual components of the TES system. Subsequently, a novel cascading modelling framework was realised to provide an integrated holistic modelling solution that takes into account the results of the individual modelling components. The cascading framework was built in a hierarchical structure that considers the interrelationships between the integrated energy components leading to seamless modelling of whole operation as a single system. The performance of the proposed H2M-LSTM was compared against a variety of well-known machine learning algorithms through an extensive experimental analysis. The efficacy of the proposed energy framework was demonstrated in comparison to the modelling performance of the individual components, by utilizing three prediction performance indicators. The findings of the present study offer: (i) insights on the low-error performance of tailor-made LSTM architectures fitting the TES modelling problem, (ii) deeper knowledge of the behaviour of integral energy frameworks operating in fine timescales and (iii) an alternative approach that enables the real-time or semi-real time deployment of TES modelling tools facilitating their use in real-world settings.
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Rita, Novia, et Novrianti Novrianti. « Optimalisasi Production Well Test Untuk Mendukung Performance Produksi Dengan Cara Tiering System Pada Area X Lapangan Y ». Journal of Earth Energy Engineering 5, no 1 (29 avril 2016) : 11–20. http://dx.doi.org/10.22549/jeee.v5i1.459.
Texte intégralRésumé :
Area X merupakan salah satu area yang terdapat di Lapangan Y PT. Chevron Pacific Indonesia, dimana area X terdiri dari 563 sumur. Pada Area X ini dilakukan pekerjaan tes terhadap sumur sebanyak 2 kali per bulan, sehingga untuk 563 sumur diperlukan 1126 kali tes perbulan. Fasilitas yang tersedia untuk production well test pada Area X hanya mampu 960 kali tes per bulan. Sehingga 116 sumur tidak akan mendapatkan jadwal tes pada setiap bulannya. Apabila prosedur seperti ini tetap dilakukan secara terus menerus maka akan selalu terdapat sisa sumur yang belum terpenuhi untuk dilakukan tes di setiap bulannya. Untuk mengatasi permasalahan ini dilakukan Tiering system. Tiering system adalah suatu metode dalam proses pengujian sumur dimana dalam metode ini sumur-sumur akan dikelompokkan berdasarkan produksi terbesar hingga terkecil. Sumur yang tergolong big production akan berada pada urutan teratas untuk dilakukan Well Testing (Tier #1) dan diikuti Tier #2, Tier #3 dan Tier #4 (Tiering System merupakan metode atau proses yang digunakan untuk mengelompokan data-data production well testing sumur yang banyak menjadi kelompok kelompak kecil, yang bertujuan untuk membantu mengoptimalisasi proses pekerjaan well test di Lapangan (Human Resources Sumatra Operation, 2012).. Kuantitas test sumur setiap bulan akan disesuaikan dengan kebutuhan data dan kategori Tier, hal ini bertujuan untuk mendapatkan data yang valid secara continue pada sumur, sehingga cepat diketahui dan di follow up jika terjadi permasalahan penurunan produksi pada sumur-sumur tersebut. Dengan Tiering System, maka 563 sumur yang harus dilakukan well testing setiap bulannya di Area X jadi terpenuhi karena hanya membutuhkan 777 kali tes perbulan. Bahkan waktu pelaksanaan well test masih tersisa untuk 183 kali tes, hal ini juga berdampak pada kenaikan produksi sebesar 5441 bbl per hari dengan keuntungan sebesar US$ 217.621,75.
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Luk, Jim T. C., Freeman K. C. Kwok, Indy M. K. Ho et Del P. Wong. « Acute Responses of Core Muscle Activity during Bridge Exercises on the Floor vs. the Suspension System ». International Journal of Environmental Research and Public Health 18, no 11 (31 mai 2021) : 5908. http://dx.doi.org/10.3390/ijerph18115908.
Texte intégralRésumé :
This study aimed to compare the neuromuscular activation of selected core musculature in supine and prone bridge exercises under stable versus suspended conditions. Forty-three healthy male participants were recruited to measure the electromyographic activities of the rectus abdominis (RA), lumbar multifidus (LM), thoracic erector spinae (TES), rectus femoris (RF), gluteus maximus (GM), and biceps femoris (BF) during supine and prone bridge exercises under six conditions: control, both arms and feet on the floor (Pronecon and Supinecon); arms on the floor and feet on the suspension system (Prone-Feetsuspension and Supine-Feetsuspension); and arms on the suspension system and feet on the floor (Prone-Armsuspension and Supine-Armsuspension). Prone-Armsuspension yielded significantly higher activities in the RA, RF, TES, and LM than Prone-Feetsuspension (p < 0.01) and Pronecon (p < 0.001). Moreover, Supine-Feetsuspension elicited significantly higher activities in the RA, RF, TES, LM, and BF than Supine-Armsuspension (p < 0.01) and Supinecon (p < 0.001). Furthermore, Supine-Feetsuspension elicited significantly higher activities in the RF, TES, and BF than Supinecon (p < 0.01). Therefore, if the RA and/or RF were the target training muscles, then Prone-Armsuspension was recommended. However, if the TES, LM, and/or BF were the target training muscles, then Supine-Feetsuspension was recommended.
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Biyanto, Totok R., Akhmad F. Alhikami, Gunawan Nugroho, Ridho Hantoro, Ridho Bayuaji, Hudiyo Firmanto, Joko Waluyo et Agus Imam Sonhaji. « Thermal Energy Storage Optimization in Shopping Center Buildings ». Journal of Engineering and Technological Sciences 47, no 5 (30 octobre 2015) : 549–67. http://dx.doi.org/10.5614/j.eng.technol.sci.2015.47.5.7.
Texte intégralRésumé :
In this research, cooling system optimization using thermal energy storage (TES) in shopping center buildings was investigated. Cooling systems in commercial buildings account for up to 50% of their total energy consumption. This incurs high electricity costs related to the tariffs determined by the Indonesian government with the price during peak hours up to twice higher than during off-peak hours. Considering the problem, shifting the use of electrical load away from peak hours is desirable. This may be achieved by using a cooling system with TES. In a TES system, a chiller produces cold water to provide the required cooling load and saves it to a storage tank. Heat loss in the storage tank has to be considered because greater heat loss requires additional chiller capacity and investment costs. Optimization of the cooling system was done by minimizing the combination of chiller capacity, cooling load and heat loss using simplex linear programming. The results showed that up to 20% electricity cost savings can be achieved for a standalone shopping center building.
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Mohd Amin, Nasrul Amri, Frank Bruno et Martin Belusko. « Investigation of Conducting Pins in Sphere Filled with Phase Change Material for Enhancing Heat Transfer in Thermal Energy Storage ». Advanced Materials Research 472-475 (février 2012) : 1693–97. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.1693.
Texte intégralRésumé :
The utilisation of phase change material (PCM) for thermal energy storage (TES) can significantly enhance the energy savings achievable with renewable thermal systems. Sphere based packed bed systems have been used as TES for many years. However, due to the thermal resistance within these systems, the heat transfer is limited and not all the PCM can be used effectively. This study focuses on heat transfer enhancement options for single PCM sphere in a TES system. An experimental investigation has been conducted using water as the PCM. The thermal performance of plain plastic sphere containing PCM has been compared to plastic sphere encapsulated with conducting pins. The heat transfer rate of the sphere with conducting pins was more than 34% that of the sphere without pins.
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Sahyadi, Dhandy Yusuf, et Intaglia Harsanti. « RANCANG BANGUN TES KRAEPELIN BERBASIS WEBSITE ». Jurnal Ilmiah Informatika Komputer 23, no 3 (2018) : 223–35. http://dx.doi.org/10.35760/ik.2018.v23i3.2377.
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Salah satu jenis tes bakat khusus yang sering digunakan dalam serangkaian psikotes, khususnya tes seleksi masuk sekolah dan konseling jurusan adalah tes Kraepelin. Penyelenggaraan pengukuran psikologis baik tes kepribadian, intelegensi, dan bakat di Indonesia masih menggunakan kertas (paper-and-pencil based) sebagai media pengukurannya, baik sebagai media penginputan soal oleh pihak penyelenggara tes maupun sebagai media penginputan jawaban dari pihak peserta tes. Penelitian ini bertujuan untuk membuat suatu aplikasi tes psikologi berupa tes Kraepelin berbasis website. Perancangan dan pembuatan aplikasi tes Kraepelin berbasis website dibangun dengan menggunakan editor text Code Brackets, database aplikasi dibangun menggunakan MySQL, bahasa pemrograman untuk koneksi antara website dengan database menggunakan bahasa pemrograman PHP, dan untuk menguji aplikasi tersebut digunakan web browser Google Chrome. Pembuatan aplikasi tes Kraepelin mengaplikasikan metode perhitungan skor (scoring system) berdasarkan perhitungan objektif untuk 2 jurusan, yaitu jurusan IPA (eksakta) dan jurusan IPS (sosial). Aplikasi tes berdurasi 22 menit yang terdiri dari 45 kolom dan 61 baris soal dengan batas waktu pengerjaan soal per-kolom adalah 30 detik. Aplikasi tes Kraepelin berbasis website ini diharapkan dapat mendukung semua pihak terkait didalamnya baik pihak penyelenggara tes dan peserta tes untuk melaksanakan kegiatan tes Kraepelin sesuai dengan tujuan penggunaan tes yaitu sebagai rangkaian psikodiagnostik untuk seleksi testee jurusan eksakta dan sosial.
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Li, Xiaolei, Zhifeng Wang, Ershu Xu, Linrui Ma, Li Xu et Dongming Zhao. « Dynamically Coupled Operation of Two-Tank Indirect TES and Steam Generation System ». Energies 12, no 9 (7 mai 2019) : 1720. http://dx.doi.org/10.3390/en12091720.
Texte intégralRésumé :
A thermal energy storage system is a critical component in concentrating solar power plants (CSPP), owing to which concentrating solar power (CSP) has superiorities over photovoltaic and wind power. Currently, the sole thermal energy storage (TES) system which is commercially applied to parabolic trough solar power (PTSP) plants worldwide is the two-tank indirect TES. In this study, the dynamic models of a solar field (SF), a two-tank indirect TES system, and a steam generation system (SGS) in a PTSP plant were developed and validated. Control and operation strategies on a clear day and a cloudy day were provided, and the dynamic simulations of the coupled operation using actual meteorological data were conducted. The influence of the two-tank indirect TES system on the dynamic characteristics of SGS on a system level was analyzed. Other key parameter variations were also presented. The results show that during the transition from the charge to the discharge process, the steam parameters slowly decrease. The variation of the molten salt height is further affected by the molten salt mass flow rate at the inlet and outlet of the molten salt tank. We adopted the PI control to adjust the thermal oil mass flow rate, thermal oil temperature, and water height. The developed dynamic models are useful in guiding system operation and control.
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Yi, Joong Yong, Kyung Min Kim, Jongjun Lee et Mun Sei Oh. « Exergy Analysis for Utilizing Latent Energy of Thermal Energy Storage System in District Heating ». Energies 12, no 7 (11 avril 2019) : 1391. http://dx.doi.org/10.3390/en12071391.
Texte intégralRésumé :
The thermal energy storage (TES) system stores the district heating (DH) water when the heating load is low. Since a TES system stores heat at atmospheric pressure, the DH water temperature of 115 °C has to be lowered to less than 100 °C. Therefore, the temperature drop of the DH water results in thermal loss during storage. In addition, the DH water must have high pressure to supply heat to DH users a long distance from the CHP plant. If heat is to be stored in the TES system, a pressure drop in the throttling valve occurs. These exergy losses, which occur in the thermal storage process of the general TES system, can be analyzed by exergy analysis to identify the location, cause and the amount of loss. This study evaluated the efficiency improvement of a TES system through exergy calculation in the heat storage process. The method involves power generation technology using the organic Rankine cycle (ORC) and a hydraulic turbine. As a result, the 930 kW capacity ORC and the 270 kW capacity hydraulic turbine were considered suitable for a heat storage system that stores 3000 m3/h. In this case, each power generation facility was 50% of the thermal storage capacity, which was attributed to the variation of actual heat storage from the annual operating pattern analysis. Therefore, it was possible to produce 1200 kW of power by recovering the exergy losses. The payback period of the ORC and the hydraulic turbine will be 3.5 and 7.13 years, respectively.
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UEDA, Satoshi, Hisami YAMAGUCHI, Masateru KOTANI, Sumihisa Kimura, Yuji TOKUNAGA, Akira KAGAYAMA et Takehisa HATA. « Development of a Novel Drug Release System, Time-Controlled Explosion System(TES). II. Design of Multiparticulate TES and in Vitro Drug Release Properties. » CHEMICAL & ; PHARMACEUTICAL BULLETIN 42, no 2 (1994) : 359–63. http://dx.doi.org/10.1248/cpb.42.359.
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Imre, Attila R., Sindu Daniarta, Przemysław Błasiak et Piotr Kolasiński. « Design, Integration, and Control of Organic Rankine Cycles with Thermal Energy Storage and Two-Phase Expansion System Utilizing Intermittent and Fluctuating Heat Sources—A Review ». Energies 16, no 16 (11 août 2023) : 5948. http://dx.doi.org/10.3390/en16165948.
Texte intégralRésumé :
In order to lessen reliance on fossil fuels, a rise in interest in the utilization of fluctuating and intermittent heat sources derived from renewable energy (such as solar thermal, ocean thermal, and geothermal) and waste heat has been observed. These heat sources could be used to generate electricity at relatively low and medium temperatures, for example, through the organic Rankine cycle (ORC). In some case studies, various approaches have been developed to deal with and design ORCs in the desired operating condition utilizing suitable working fluids. This article aims to review some designs and integrated systems of ORC with thermal energy storage (TES) and a two-phase expansion system focusing on the utilization of medium- and low-temperature heat sources in which some subcritical ORCs are presented. Moreover, several possible control systems (both conventional and advanced ones) of ORC with TES and a two-phase expansion system are reported and compared. At the end of this article, the possible future developments of design and control systems are discussed to describe advanced ORC for utilizing low-grade heat sources. This study aims to provide researchers and engineers with an insight into the challenges involved in this process, making industrialization of ORC technology more extensive, in particular when combined with TES and a two-phase expansion system.