Thematische Bibliographien / Stange energi

Auswahl der wissenschaftlichen Literatur zum Thema „Stange energi“

Autor: Grafiati

Veröffentlicht am 25. Juli 2024

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Zeitschriftenartikel zum Thema "Stange energi"

Fagorite, Victor Inumidun, Damian Ifeanyi Njoku, Henry Olumayowa Oluwasola, Samuel Okechukwu Onyekuru und Emeka Emmanuel Oguzie. „Review of Solar Energy Applications for Water Treatment; a Global and African Perspective“. Geoinformatica Polonica 21 (30.12.2022): 57–82. http://dx.doi.org/10.4467/21995923gp.22.005.17083.

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Solar energy is energy derived from the sun’s radiation. The sun’s energy can be exploited using a variety of technologies, including (a) photovoltaic (PV)/concentrator photovoltaics (CPV) systems that convert photons to electricity; and (b) solar thermal technologies that capture thermal energy from the sun’s radiation using solar collectors or concentrated solar power systems (CSP). Due to the quest for power supply from renewable, cheap, and non-gaseous emission sources coupled with the attempts to combat the shortage of potable water in rural areas, much research on the interface of solar energy power systems with water treatment plants has been reported. However, the greater part of the existing reports are based on theoretical modelling, with only minimal experimental, cost analysis, pilot projects and strategic studies. Also, even though solar-powered water treatment technologies are still in the early stages of research, and very rare studies based on real plants have been conducted, existing publications are mostly focused on single principles, making it impossible to assess and compare several technologies. Globally, this review has particularly highlighted the recent advances in the application of solar energy technologies in desalination and wastewater treatments. It likewise highlighted the key research findings and the critical gaps in the existing achievements. It further highlighted the attempts made on hybrid techniques with other renewable energy sources such as wind and geothermal energies which are paramount for scaling up and commercialization uses. However, the findings revealed that most of these studies were restricted to particular parts of the globe without candid evidence from the African perspective, especially Sub-Saharan Africa. Thus, due to the paucity of information concerning this topic within the region, there is a need for further studies on the application of solar energy for water treatment, especially on a pilot scale level for sustainable development. PRZEGLĄD ZASTOSOWAŃ ENERGII SŁONECZNEJ DO OCZYSZCZANIA ŚCIEKÓW; PERSPEKTYWA GLOBALNA I AFRYKAŃSKA Energia pochodząca z promieniowania słońca może być eksploatowana przy użyciu różnorodnych technologii, w tym (a) fotowoltaiki (PV)/skoncentrowanej fotowoltaiki (CPV), systemów, które przekształcają fotony w energię elektryczną; i (b) słoneczne technologie cieplne, które wychwytują energię cieplną z promieniowania słonecznego przy pomocy kolektorów słonecznych lub skoncentrowanych systemów energii słonecznej (CSP). Z powodu poszukiwań dostaw energii ze źródeł odnawialnych, tanich i nie emitujących zanieczyszczeń gazowych, a także wysiłków na rzecz walki z niedoborem wody pitnej w obszarach wiejskich, opublikowano wiele badań na temat systemów pozyskiwania energii słonecznej dla obsługi oczyszczalni ścieków. Jednakże większość istniejących opracowań oparta jest o modelowanie teoretyczne, jedynie z minimalną częścią eksperymentalną, analizą kosztów, projektami pilotażowymi i studiami strategicznymi. Co więcej, technologie oczyszczania wody zasilane energią słoneczną wciąż są na wczesnym etapie, a prace dotyczące badań w prawdziwych oczyszczalniach są rzadkie, publikacje w większości skupiają się na pojedynczych przypadkach, uniemożliwiając porównywanie kilku technologii wykorzystujących energię słoneczną do odsalania wody i oczyszczania ścieków. Wskazuje również kluczowe wyniki badań oraz istotne braki w istniejącym stanie zaawansowania. Ponadto przedstawia próby z technikami hybrydowymi, wykorzystującymi inne odnawialne źródła energii, takie jak wiatr i energia geotermalna, które są kluczowe w zwiększaniu skali produkcji i komercjalizacji. Jednakże wyniki badań wskazują, że większość prac ograniczona jest do innych kontynentów; brak jest jasnej afrykańskiej perspektywy, szczególnie dotyczącej Afryki subsaharyjskiej. Tak więc, z powodu skąpych informacji na ten temat, które dotyczą tego regionu, istnieje potrzeba dalszych badań nad zastosowaniem energii słonecznej do oczyszczania ścieków, szczególnie w skali pilotażowej, które przyczynią się do zrównoważonego rozwoju.

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Chen, Lihao, und Kunio Yoshikawa. „Bio-oil upgrading by cracking in two-stage heated reactors“. AIMS Energy 6, Nr. 1 (2018): 203–315. http://dx.doi.org/10.3934/energy.2018.1.203.

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Park, Sung-Ho, Won-Tae Kim und Ji-Hwan Jeong. „Analysis of Component Parts of OPR1000 Nuclear Power Plants Demanded at the Operation Stage“. Journal of Energy Engineering 30, Nr. 2 (30.06.2021): 20–29. http://dx.doi.org/10.5855/energy.2021.30.2.020.

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Imran, Rasool M., und Kadhim Hamzah Chalok. „Innovative mode selective control and parameterization for charging Li-ion batteries in a PV system“. AIMS Energy 12, Nr. 4 (2024): 822–39. http://dx.doi.org/10.3934/energy.2024039.

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Li-ion batteries can be charged with different techniques according to the charging time and required capacity usage. Most charging techniques face difficulties when implemented in PV systems due to the intermittent and unpredictable nature of the power supply. This paper addresses the issue of determining the appropriate charging technique for Li-ion batteries in a PV system. We have developed a mode-selective control approach that determines the optimal charging mode according to the given SOC and solar irradiation, aiming to maximize the utilization of the generated PV power. The developed control approach has been implemented using a dual-switched buck converter in the MATLAB/Simulink environment. The key control algorithm focused on regulating current, with different references being used based on the selected charging mode. Three references for charging current were set: the maximum current, the required current assigned based on the given SOC, and the pulsed current. The pulsed current reference was employed during a stage of the charging process to accelerate charging and prevent dissipation of PV power. Furthermore, a gain-scheduled controller with carefully picked control parameters was used to ensure stable operation across different modes. The results proved the effectiveness of the proposed control in reducing charging time and minimizing PV power dissipation without resorting to the use of harmful charging currents.

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Zhao, Xianhui, Lin Wei und James Julson. „First stage of bio-jet fuel production: non-food sunflower oil extraction using cold press method“. AIMS Energy 2, Nr. 2 (2014): 193–209. http://dx.doi.org/10.3934/energy.2014.02.193.

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Tsai, Ming-Tang, und Chih-Jung Huang. „Integration of the radial basis functional network and sliding mode control for the sunshine radiation forecast“. AIMS Energy 12, Nr. 1 (2023): 31–44. http://dx.doi.org/10.3934/energy.2024002.

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<abstract> In this paper, we propose a forecasting system of sunshine radiation for planners to quickly and accurately predict the output of solar power. The field data, including observation time, temperature, relational humidity, wind speed and global radiation, were collected, and the data clusters were embedded in the Excel Database. To improve the computational performance, the data selection technique was used in the stage of data cleaning, data integration and data reduction. Using the Integration of the Radial Basis Function Network (RBFN) and Sliding Mode Control (SMC), a Sliding Mode Radial Basis Function Network (SMRBFN) was proposed to solve this forecasting problem. Since the Sliding Mode Control has the design's sense of optimal parameters, three parameters in the SMRBFN were dynamically adjusted to promote the accurate and reliability of forecasting system. Linking the SMRBFN and Excel database, the learning stage and testing stage of SMRBFN retrieved the input data from Excel Database to perform and analyze the forecasting system. The proposed algorithm was tested on Kaohsiung district in summer and winter. The average prediction error of MAPE and RMSE obtained from the forecasting results are about 9% and 0.223, respectively. It can be proved that SMRBFN can efficiently forecast the sunshine radiation and accurately provide the output of solar power in an uncertainty environment. </abstract>

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Tsuzuki, Yuto, Yutaro Akimoto und Keiichi Okajima. „Preventive control method for stable operation of proton exchange membrane fuel-cell stacks“. AIMS Energy 11, Nr. 1 (2023): 64–78. http://dx.doi.org/10.3934/energy.2023004.

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<abstract> Flooding and dry-out are major drawback issues in proton exchange membrane fuel cells (PEMFC), which necessitate adequate prevention control techniques. In a fuel-cell stack, as flooding and dry-out occur on the inlet and outlet sides, respectively, both faults can exist simultaneously. Therefore, the timely detection of these two contradictory faults is crucial for implementing timely control measures. In this study, we propose a preventive control method that detects the fault signs early for more effective prevention. The proposed method uses a curve-fitting method, which uses overpotential as the control index. As the control index can be obtained by measuring the current, voltage, and temperature, the evaluation can be performed quickly, making it easy to implement in a PEMFC system. Under a single fault, the stack output power, hydrogen consumption, and power efficiency of the proposed preventive control method and the previous study on flooding were compared. The results showed that our preventive control method could detect flooding sooner and was superior in stack output power, hydrogen consumption, and power generation compared to the fault control method. Under conditions of mixed flooding and dry-out, both flooding and dry-out were detected using the overpotential as the control index. Thus, because the proposed method initiates control measures before the fault progresses, it is possible to ensure the continued stable operation of the fuel cells. </abstract>

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Cheng, Shouyun, Lin Wei, Xianhui Zhao, Yinbin Huang, Douglas Raynie, Changling Qiu, John Kiratu und Yong Yu. „Directly catalytic upgrading bio-oil vapor produced by prairie cordgrass pyrolysis over Ni/HZSM-5 using a two stage reactor“. AIMS Energy 3, Nr. 2 (2015): 227–40. http://dx.doi.org/10.3934/energy.2015.2.227.

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Ferreira Costa, Levy, und René Pastor Torrico Bascopé. „Stand-alone Photovoltaic System With Three Energy Processing Stages“. Eletrônica de Potência 16, Nr. 4 (01.11.2011): 348–56. http://dx.doi.org/10.18618/rep.20114.348356.

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Harapan, M.T., Andi. „KAJIAN PENGARUH DAUR HIDUP BANGUNAN TERHADAP MENINGKATNYA PEMAKAIAN ENERGI DI DALAM BANGUNAN“. Jurnal Arsitektur ARCADE 5, Nr. 2 (02.08.2021): 135. http://dx.doi.org/10.31848/arcade.v5i2.758.

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Abstract: The increased of energy used on building operational is impacted by many factors, specially impacted by building delivering process. Delivering process is starting from design stage, construction stage until operational (occupacion) stage. If one of this staging is worst, would be affecting to the other staging (bad or good). Design stage is the crutial process on building delivering process, because on this stage the building criterias are setted and inputted to the drawing and specification documents. One of the example is energy used of the building, which should be setted on the design process and applied on the drawing and construction processes. This research is conducted with literature study and coparing with some datas about energy used of building in general about energy used of buildings.Abstrak: Meningkatnya pemakaian energi pada tahap operasional (pemakaian) tidak terlepas dari pengaruh tahap-tahap sebelumnya dari bangunan tersebut. Tahap desain, tahap konstruksi, dan tahap operasional dan maintenance merupakan suatu rangkaian kegiatan yang saling mempengaruhi yang sering diistilahkan sebagai daur hidup bangunan. Jika satu tahapan buruk maka akan memberikan dampak bagi tahapan berikutnya. Salah satu dampak negatif dari tidak baiknya daur hidup bangunan adalah meningkatnya pemakaian energi, yang dapat disebabkan oleh tahap desain yang tidak mempertimbangkan desain hemat energi, atau tahap konstruksi yang tidak baik sehingga menyebabkan pemakaian energi meningkat. Makalah ini merupakan studi kajian pustaka dari berbagai sumber terkait berbagai faktor yang mempengaruhi meningkatnya pemakaian energi pada tahap operasional di dalam bangunan yang dikaitkan dengan daur hidup bangunan.

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Dissertationen zum Thema "Stange energi"

An, Anastasiia. „Early Design Stage Energy Optimization of Bysjöstrand Ecovillage, Sweden“. Thesis, Högskolan Dalarna, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:du-34786.

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Decisions made at the early stage of building and settlement design can greatly influence the energy performance of the built environment. However, the type of feasible design intervention and their impact strong depends on project: if it is a new development or a re-development, whether the setting of the project is urban or rural, etc. Utilizing Bysjöstrand EcoVillage as a case, the aim of this thesis is to improve the energy performance of a new development at its early design stage through the passive and active use of solar energy. The study evaluated the energy saving potential of various passive solar design strategies as well as the solar energy potential of the new development. The steps taken to reduce the energy consumption are focused on the annual heating demand of buildings, since it accounts for more than a half of the total energy consumed by the village. The energy saving potential of the following passive solar design approaches were considered: building siting, building orientation, windows-to-wall ratio (WWR) analysis and insulation thickness optimization from the economic perspective. Furthermore, an assessment of energy generation potential from on-site photovoltaic (PV) systems was conducted. The financial viability of each building’s PV system was also conducted. According to the results, the evaluated passive solar design strategies can reduce the annual heating energy consumption close to 17 %. Regarding onsite energy generation, electricity from roof-installed PV systems can cover over 100% of the annual energy consumption estimated for the residential lighting and equipment within the eco-village. In summary, this study has demonstrated that with the above design considerations a 50 % reduction of energy consumption from the utility grid is possible. This study is useful for architects, energy engineers, and other parties who are involved in residential buildings energy performance optimization.

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Walsh, Daniel. „Fully sustainable energy module - Stage 1: Source research and development“. Thesis, Walsh, Daniel (2014) Fully sustainable energy module - Stage 1: Source research and development. Other thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/24193/.

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The rising cost of energy, particularly in the form of electrical power is a concern for business and households predominately in rural regions of Western Australia. The higher ongoing costs due to aging assets and infrastructure make it a genuine expense that almost always has the customer looking for cheaper options. Two particular businesses commissioned a project for developing a renewable approach to help satisfy their demands which due to the size and nature of the operation required a medium scale system that was both economical and environmentally sustainable. The project purpose was to research and build the first stage or the “source” of a small prototype to address these concerns in the form of a Fully Sustainable Energy Module (FSEM). The objective is to compete or better the average cost per kilowatt hour of the Western Australian electricity suppliers, Horizon Power (HP) and those making up the South West Interconnected System (SWIS). While assessing the design options of the FSEM, various types of software were used extensively to assist in clarifying the optimum designs throughout the project for an initial theoretical approach. Designs such as a custom Parabolic/hyperbolic reflector and Fresnel lens directed to a Concentrator Solar Cell Receiver Assembly (CSCRA), coolant pumping for junction temperature control and simulation of multiple system configurations for electrical power requirements were assessed to maximise energy output per square metre of solar output. Building a prototype requires a sound knowledge base to ensure that it gives the output expected. Data that can assist inform decisions made to further enhance its operation giving the best possible design for final production. Developing an understanding of a feasibility study on the proof of concept for prototype building is further enhanced by researching the importance and structure of project plans and business expectations. It highlights that the strengths and weakness that need considering and help to show a route to a successful finished product. Prevalent was the design issue for the parabolic/hyperbolic reflector and the intricacies that exposed the difficulty in getting the system to work efficiently due to very small tolerances in construction. When finally settling with a Fresnel lens type the “source” of the FSEM prototype at the time of publication showed practical results of DC output of cell capacity and consistent hot water set at various temperatures showing solar energy transferred.

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Atenas, Maldonado Felipe Eduardo. „A two-stage model for planning energy investment under uncertainty“. Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170925.

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Tesis para optar al grado de Magíster en Ciencias de la Ingeniería, Mención Matemáticas Aplicadas
Memoria para optar al título de Ingeniero Civil Matemático
We consider risk-averse stochastic programming models for the Generation Expansion Planning problem for energy systems with here-and-now investment decisions and generation variables of recourse. The resulting problem is coupled both along scenarios and along power plants. We develop a new decomposition technique to solve the energy optimization problem, resulting from the combination of two existing procedures, one to deal with stochastic programming problems through decomposition for different realizations of the stochastic process representing the uncertain data, and the second one is a method aim to find solutions to nonsmooth optimization problems. More precisely, we combine the Progressive Hedging algorithm to deal with scenario separability, obtaining a separate subproblem for each scenario, and an inexact proximal bundle method to handle separability for different power plants in each subproblem. By suitably combining these approaches, if the evaluation errors of the proximal bundle method vanish asymptotically, then bundle method converges to an approximate solution to each scenario subproblem. Thus, under mild convexity assumptions, the Progressive Hedging algorithm generates a sequence that converges to a solution to the original problem. The methodology is satisfactorily assessed on a test instance of the Generation Expansion Planning problem, whose reduced size allows us to compare the results with those obtained when solving the problem directly, and without decomposition.
CONICYT-PFCHA/Magister Nacional/2018-22181067 y CMM Conicyt PIA AFB170001

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Hopf, Konstantin [Verfasser], und Thorsten [Akademischer Betreuer] Staake. „Predictive Analytics for Energy Efficiency and Energy Retailing / Konstantin Hopf ; Betreuer: Thorsten Staake“. Bamberg : University of Bamberg Press, 2019. http://d-nb.info/1191183580/34.

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Helminiak, Nathaniel Steven. „Construction and characterization of a single stage dual diaphragm gas gun“. Thesis, Marquette University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10641398.

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In the interest of studying the propagation of shock waves, this work sets out to design, construct, and characterize a pneumatic accelerator that performs high-velocity flyer plate impact tests. A single stage gas gun with a dual diaphragm breach allows for a non-volatile, reliable experimental testing platform for shock phenomena. This remotely operated gas gun utilizes compressed nitrogen to launch projectiles down a 14 foot long, 2 inch diameter bore barrel, which subsequently impacts a target material of interest. A dual diaphragm firing mechanism allows the 4.5 liter breech to reach a total pressure differential of 10ksi before accelerating projectiles to velocities as high as 1,000 m/s (1570-2240 mph). The projectile’s velocity is measured using a series of break pin circuits. The target response can be measured with Photon Doppler Velocimetry (PDV) and/or stress gauge system. A vacuum system eliminates the need for pressure relief in front of the projectile, while additionally allowing the system to remain closed over the entire firing cycle. Characterization of the system will allow for projectile speed to be estimated prior to launching based on initial breach pressure.

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Lattová, Jana. „Rola obnoviteľných zdrojov energie v regionálnom a municipálnom rozvoji so zameraním na bioplynové stanice“. Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-125113.

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This diploma thesis deals with the problematic of utilization of renewable energy sources in regional context. Thesis is divided into two main parts, which are theoretical and empirical. Theoretical part provides general view on renewables, describes its position according to fossil fuels, analysis its potential, ways of development and support. Practical part of the work analysis two projects of biogas stations and also evaluates its impacts on local development. These impacts are compared in the final part of the work and on its basics particular conclusions are drew.

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Kudličková, Monika. „Design dobíjecí stanice pro elektromobily“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401507.

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The theme of this diploma thesis is design of recharging station for electrical cars. The result of this thesis is a conceptual design of this station. It summarizes technological, structural, economic, ergonomic and visual aspects with respect to current trends and technical solution.

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Li, Beidi. „Use of Building Energy Simulation Software in Early-Stage of Design Process“. Thesis, KTH, Byggvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217902.

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In traditional planning process, energy analysts work on finalized architectural designs and have limited capability to amend inefficient energy features such as high aspect ratio. Energy efficiency being a major part of sustainable design, the need for performance-oriented design tools has become imminent. There is a wide range of energy simulation tools across the world. Crawley et al. (2005) proposes a plain comparison of the most common ones based on vendor-supplied information. The present report aims to identify simulation tools that can help architects making energy-efficient design decisions in early stage of building process and the most suitable programs will be tested on a standard case in Stockholm area with respect to their architecture, functionalities, usability and limitations.

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Wei, Quantum Jichi. „Two-stage reverse osmosis : optimal element configuration and flux distribution, energy savings“. Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111900.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 57-59).
In a two-stage reverse osmosis (RO) system of finite size, there are two degrees of freedom not present in a single-stage RO system: distribution of RO elements between the two stages (system design), and feed pressures (system operation). In this study, we investigate the optimal system design and operation of a two-stage RO system with a mass-balance model and establish a lower bound for the energy savings achieved by the optimized two-stage system compared to a single-stage system. A two-stage RO system may consume more or less energy than a single-stage RO system of the same size and freshwater productivity, depending on the first-stage feed pressure and second-stage feed pressure. To minimize energy consumption, feed pressures should be chosen to minimize spatial variance in flux. The optimal element configuration places at least half the elements in the first stage; the exact configuration depends on feed salinity, recovery ratio, and membrane permeability. The greatest energy savings are achieved with a two-stage RO system that has both optimal element configuration and feed pressures. More energy can be saved by adding a stage when the thermodynamic least work of separation is larger. For a given feed salinity, energy savings from adding a second stage grow as recovery ratio increases. Brackish water feeds must be taken to high recovery ratios to achieve substantial energy savings; comparable savings can be achieved at lower recovery ratios for higher salinity feeds. We find that significant energy can be saved with the simplest two-stage RO design, at a system flux similar to today's RO plants and accounting for the effects of concentration polarization.
by Quantum J. Wei.
S.M.

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Zhao, Zheng. „High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System“. Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27520.

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A single-phase grid connected transformerless photovoltaic (PV) inverter for residential application is presented. The inverter is derived from a boost cascaded with buck converter along with a line frequency unfolding circuit. Due to its novel operating modes, high efficiency can be achieved because there is only one switch operating at high frequency at a time, and the converter allows the use of power MOSFET and ultra-fast reverse recovery diode. This dissertation begins with theoretical analysis and modeling of this boost-buck converter based inverter. And the model indicates small boost inductance will leads to increase the resonant pole frequency and decrease the peak of Q, which help the system be controlled easier and more stable. Thus, interleaved multiple phases structure is proposed to have small equivalent inductance, meanwhile the ripple can be decreased, and the inductor size can be reduced as well. A two-phase interleaved inverter is then designed accordingly. The double-carrier modulation method is proposed based on the inverterâ s operation mode. The duty cycle for buck switch is always one if the inverter is running in boost mode. And the duty cycle for boost switches are always zero if the inverter is running in buck mode. Because of this, the carrier for boost mode is stacked on the top of the carrier for buck mode, as a result, there is no need to compare the input and output voltage to decide which mode the inverter should operate in. And the inverter operates smoothly between these two modes. Based on similar concept, three advanced modulation methods are proposed. One of them can help further improve the efficiency, and one of them can help increase the bandwidth and gain, and the last one takes the advantage of both. Based on similar concept, another three dual-mode double-carrier based SPWM inverters are proposed. With both step-up and step-down functions, this type of inverter can achieve high efficiency in a wide range because only one switch operates at the PWM frequency at a time. Finally, the simulation and experiment results are shown to verify the concept and the tested CEC (California Energy Commission) efficiency is 97.4%. It performs up to 2% more efficiently better than the conventional solution.
Ph. D.

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Bücher zum Thema "Stange energi"

Lukas, Cynthia K. Center stage summer. Madison, Wis: Square One Publishers, 1988.

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Vešović, Radonja. Kad vrijeme stane: Izbor pjesama. Podgorica: Crnogorska akademija nauka i umjetnosti, 2003.

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Carolina, Menezes Anna, und Chartered Institution of Building Services Engineers, Hrsg. Evaluating operational energy performance of buildings at the design stage. London: Chartered Institution of Building Services Engineers, 2013.

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Stringer, John. Focus on energy: Photo pack. Godalming: WWF UK, 2001.

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Bamberger, Robert. Energy policy: Setting the stage for the current debate. [Washington, D.C.]: Congressional Research Service, Library of Congress, 2001.

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Stringer, John. Energy: A resource book to accompany Stage two science. Warwick: Educational Television Co., 1995.

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Library of Congress. Congressional Research Service., Hrsg. Energy policy: Setting the stage for the current debate. [Washington, D.C.]: Congressional Research Service, Library of Congress, 2001.

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Library of Congress. Congressional Research Service., Hrsg. Energy policy: Setting the stage for the current debate. [Washington, D.C.]: Congressional Research Service, Library of Congress, 2002.

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Library of Congress. Congressional Research Service., Hrsg. Energy policy: Setting the stage for the current debate. [Washington, D.C.]: Congressional Research Service, Library of Congress, 2001.

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Library of Congress. Congressional Research Service., Hrsg. Energy policy: Setting the stage for the current debate. [Washington, D.C.]: Congressional Research Service, Library of Congress, 2003.

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Mehr Quellen

Buchteile zum Thema "Stange energi"

Sharma, Raj, und Vishnu Pareek. „Introduction—Setting the Stage“. In The World of Energy, 1–4. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6724-7_1.

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Lane, Alan M. „Single-Stage Distillation: Energy Balances“. In Separation Process Essentials, 57–74. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis: CRC Press, 2019. http://dx.doi.org/10.1201/b22271-6.

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Huang, Yuping, Panos M. Pardalos und Qipeng P. Zheng. „Two-Stage Stochastic Programming Models and Algorithms“. In SpringerBriefs in Energy, 49–86. Boston, MA: Springer US, 2017. http://dx.doi.org/10.1007/978-1-4939-6768-1_3.

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Jensen, Johs. „Energy Storage“. In Solid State Batteries, 377–86. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5167-9_25.

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Urutskoev, Leonid I. „Low-Energy Nuclear Reactions: A Three-Stage Historical Perspective“. In Nuclear Energy Encyclopedia, 497–501. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118043493.ch42.

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Infante, William, Jin Ma, Xiaoqing Han, Wei Li und Albert Y. Zomaya. „Two-Stage Optimization Strategies for Integrating Electric Vehicles in the Energy Internet“. In Energy Internet, 209–38. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45453-1_8.

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Boscoe, Francis P., und Lindsey Hutchison. „Spatial and Contextual Analyses of Stage at Diagnosis“. In Energy Balance and Cancer, 313–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18408-7_13.

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Mohideen, Reihana. „Asia’s Energy Transition: “Leapfrogging” Stages“. In Women and the Energy Revolution in Asia, 1–7. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0230-9_1.

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Abbott, Malcolm. „Energy policy“. In Markets and the State, 138–58. First Edition. | New York : Routledge, 2018.: Routledge, 2018. http://dx.doi.org/10.4324/9781351215626-10.

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Horvath, Jorge Ernesto. „Stellar Evolution up to the Final Stages“. In High-Energy Astrophysics, 57–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92159-0_4.

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Konferenzberichte zum Thema "Stange energi"

Troudi, Hajer, Moncef Ghiss, Mohamed Ellejmi, Zoubeir Tourki und Mohamed Ellejmi. „Pressure drop in one stage and two-stages of packed columns“. In 2018 9th International Renewable Energy Congress (IREC). IEEE, 2018. http://dx.doi.org/10.1109/irec.2018.8362495.

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Diniz, A. L., und T. N. Santos. „Sensitivity analysis on the definition of stages for the Multi-stage Benders decomposition approach applied to hydrothermal scheduling“. In Energy Society General Meeting. IEEE, 2008. http://dx.doi.org/10.1109/pes.2008.4596332.

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Eisenbrand, Friedrich, Stefan Funke, Andreas Karrenbauer und Domagoj Matijevic. „Energy-aware stage illumination“. In the twenty-first annual symposium. New York, New York, USA: ACM Press, 2005. http://dx.doi.org/10.1145/1064092.1064144.

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Zeng, Jie, Yezhong Wang, Ke Chen, Jiaxin Wang, Meng Qin, Jianchun Guo, Zhihong Zhao et al. „Lessons Learned from Specified Fracturing Design for Pilot Deep Shale Gas Wells with High Risk of Fracture Hits and Casing Deformation: A Successful Story in the Southern Sichuan Basin“. In SPE Conference at Oman Petroleum & Energy Show. SPE, 2024. http://dx.doi.org/10.2118/218760-ms.

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Abstract Over 65% of shale gas resources in the Sichuan Basin are stored in deep shale formations with a depth larger than 3500 m. Due to the complex tectonic deformations throughout the geological history, there are remarkable challenges for efficient stimulation of these reservoirs. First, the horizontal wells drilled from the same platform are usually penetrated by single large-scale natural fractures/faults, providing high risk of fracture hits. Secondly, natural fracture slip induces casing deformation, resulting in the failure of wellbore integrity and loss of potential fracturing stages. Thirdly, the high horizontal principal stress difference makes it difficult to create complex fracture networks, while the tractive effect makes hydraulic fracture propagates along large-scale natural fractures/faults, reducing fracture complexity. To overcome these challenges, specified fracturing strategies were designed and applied to different stages of seven pilot wells to evaluate their efficiency. The contribution of each stage is analyzed via production logging. For less naturally fractured stages, high-intensity fracturing (highest fluid pumping rate: 13.5~20.2 m3/min and sand loading value: 1.5~3.1 t/m) was applied to maximize stimulated reservoir volume (SRV). For some stages from different wells but penetrated and connected by a single large-scale natural fracture/fault, the stage in one well used the perforation-only strategy, while the adjacent wells’ stages utilized lower-intensity fracturing (highest fluid pumping rate: 14~16 m3/min and sand loading value: 1~2.1 t/m) to mitigate fracture hits. For all the stages in highly naturally fractured area (HNFA), longer-stage and more-cluster design (generally 80~100 m per stage with 8~12 clusters) was used to prevent casing deformation and reduce the cost. Moreover, in well E, two stages with high risk of fracture hits tested a novel fracture-hit-mitigation method involving temporary plugging of fracture tips of the SRV to control fracture propagation towards adjacent wells and initiate fracture branches to increase fracture complexity. All these strategies work synergistically to reduce casing deformation, mitigate cross-well communication, and create more complex fractures. No casing deformation and slight fracture hits (less than 5.6 MPa pressure rise of adjacent wells) were observed. Several perforation-only stages offer similar productivity compared with high-intensity fractured adjacent stages of the same well, indicating the success of the perforation-only strategy in HNFA. For the stages in different wells but penetrated by a single large-scale natural fracture/fault, lower-intensity fractured stages perform normally better than the perforation-only stages (1 to 1.55 times in productivity). The novel temporary-plugging-treated stage with low fracturing intensity even shows higher productivity compared with the adjacent high-intensity stimulated stage of the same well (1.53 times). Perforation-only stages should be sandwiched by lower-intensity fractured stages to reduce the cost and minimize fracture hits and casing deformation in HNFA.

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Ni, Dan, Minguan Yang, Zhong Li, Ning Zhang und Bo Gao. „Cavitation Flow Structure and Unsteady Pressure Pulsation Around a Hydrofoil“. In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-33641.

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The present work is an original study of the flow induced vibration, cavitation structures and cavitation induced pressure pulsation characteristics around a typical hydrofoil named 791, which is widely applied in the axial flow pump. From the vibration experiment of the hydrofoil at various operating conditions, it is clear that at low frequency band, with Reynolds number increasing, vibration energy first experiences a stable slightly increasing tendency, and then decreases rapidly, finally rises steeply again. Besides, according to the results of several positive incidence angles, it is observed that vibration energy usually achieves a local minimum level at a certain positive incidence angle falling into the range of 2° to 4°. Based on results obtained from the detached eddy simulation (DES) turbulent model, full developing process of cavitation stages including, incipient cavitation, sheet cavitation and cloud cavitation could be captured and easily identified. It is found that pressure spectra in accordance with different cavitation stages show great discrepancy. In the stage of incipient cavitation and cloud cavitation, predominant components in pressure spectra are caused by the cyclical evolution of the main cavity and the periodic variation of the small vacuoles shedding at the span-wise outer edge of the hydrofoil. However, in sheet cavitation stage, the pronounced excitation frequencies are generated by cyclical evolution of the main cavity and cavity shedding from both sides of the U-shaped cavitation structure. Pressure pulsation amplitude is pretty small at the cavity stable adhesion region. But the amplitude of vacuoles shedding from the hydrofoil is much larger than main cavity adhesion region at these three stages.

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Bothien, Mirko R., Andrea Ciani, John P. Wood und Gerhard Fruechtel. „Sequential Combustion in Gas Turbines: The Key Technology for Burning High Hydrogen Contents With Low Emissions“. In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90798.

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Abstract Excess energy generation from renewables can be conveniently stored as hydrogen for later use as a gas turbine fuel. Also, the strategy to sequestrate CO2 from natural gas will require gas turbines to run with hydrogen-based fuels. In such scenarios, high temperature low emission combustion of hydrogen is a key requirement for the future gas turbine market. Ansaldo Energia’s gas turbines featuring sequential combustion have an intrinsic advantage when it comes to fuel flexibility and in particular hydrogen-based fuels. The sequential combustion system is composed of two complementary combustion stages in series: one premix stage followed by an auto-ignited second stage overcoming the limits of traditional premix combustion systems through a highly effective extra tuning parameter, i.e. the temperature between the first and the second stage. The standard Constant Pressure Sequential Combustion (CPSC) system as applied in the GT36 engine is tested, at high pressure, demonstrating that a modified operation concept allows stable combustion with no changes in combustor hardware for the whole range of natural gas and hydrogen blends. It is shown that in the range from 0% to 70% (vol.) hydrogen, stable combustion is achieved at full nominal exit temperature, i.e. without any derating and thus clearly outperforming other available conventional premixed combustors. Operation between 70% and 100% is possible as well and only requires a mild reduction of the combustor exit temperature. By proving the transferability of the single-can high pressure results to the engine, this paper demonstrates the practicality of operating the Ansaldo Energia GT36 H-Class gas turbine on fuels containing unprecedented concentrations of hydrogen while maintaining excellent performance and low emissions both in terms of NOx and CO2.

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Wang, Jianjun, Minfu Lu, Daqing Zou und Sheng Liu. „Investigation of Interfacial Fracture Behavior of a Flip-Chip Package Under a Constant Concentrated Load“. In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0505.

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Abstract In this paper, the interfacial fracture behavior of a flip-chip package subjected to a constant concentrated line load was investigated using a unique 6-axis submicron tester coupled with a high density laser moiré interferometry. The real-scale three-point bending flip-chip specimen, capable of measuring the crack growth rate (along the interface) and the interfacial fracture toughness was developed. The results show that the crack propagation along the interface of the passivated silicon chip/underfill under a constant concentrated load can be categorized into three stages: (1) stable crack propagation stage, (2) unstable crack propagation stage, and (3) quasi-crack arrest stage. There exist two obvious transition points between the stable crack propagation stage and the unstable crack propagation stage, and between the unstable crack propagation stage and the quasi-crack arrest stage. The moiré interferometry technique was used to monitor and measure the crack length during the test. The crack growth rate along the interface of the passivated silicon chip/underfill was calculated in terms of the load line deflection vs. time curve obtained from the test. In addition, the relationship between the crack length and the load line deflection was calibrated by using finite element analysis. The near tip displacement fields of the flip-chip package was also determined by the same method. The energy release rate was computed by using these near tip displacement variables through an analytical expression derived by authors. The interfacial fracture toughness Gc was determined by the energy release rate corresponding to the crack length at the quasi-crack arrest stage measured in the test. The interfacial fracture toughness Gc and the phase angle ϕ of the flip-chip package considered at the interface where the passivated silicon chip meets the underfill are about 35 J/m2 and −65° respectively.

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BASU, SUKANYA, und SAPTARSHI SASMAL. „ENERGY BASED ULTRASONIC TECHNIQUES FOR EARLYSTAGE DAMAGE DETECTION IN CONCRETE STRUCTURES“. In Structural Health Monitoring 2023. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/shm2023/36971.

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During the service life, concrete structures undergo several adversities that lead to weakening in concrete and results in crack initiation. At initial stage of damage, breathing /clapping effect prevails inside the material. It results in additional nonlinearity, called as contact acoustic nonlinearity (CAN) in the structure which is often subsumed due to the material nonlinearity and leads to unidentified progression of damage inside structure. In the present study, ultrasonic investigations have been carried out to detect the flexural cracks in a scaled model of a reinforced concrete (RC) girder-deck system under four-point bending where the damage stages can be categorized as, undamaged (Stage 0), crack initiation (Stage I), crack propagation (Stage II), and severe damage (Stage III). Data acquired from ultrasonic actuation-sensing at different damage stages are processed in time-frequency domain and frequency domain using energy based ultrasonic parameters, such as, wavelet packet energy and spectral energy distribution. Further, a new energy based nonlinear acoustic parameter (ENAP) is introduced that works on the harmonic phenomenon induced by the breathing cracks. The proposed energy based methods (especially nonlinear methods) are found to be very efficient for detecting all the damage levels successfully.

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Kalabukhov, D. S., V. A. Grigoriev und V. M. Rad’ko. „Selecting Rational Parameters for Ultra-Low Power Two-Stage Axial Turbine With Pressure Stages“. In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63589.

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Ultra-low power turbine drives are used as energy sources in auxiliary power systems, energy units, terrestrial, marine, air and space transport within the confines of shaft power Ntd = 0.01...10 kW. They represent a set of input, output devices and an ultra-low power turbine (ULPT). The main objective of this article is to describe and to validate a new modified method for selecting rational parameters of two-stage axial ULPT with pressure stages that is based on the multi-objective optimization in conditions of initial data uncertainty. Using this method allows to design a high-performance turbine already at the preliminary design. This paper proposes an approach to the development of surrogate models for evaluating the integrated efficiency of two-stage ultra-low power turbine with pressure stages that is based on the use of existing mathematical models of turbine stage efficiency and mass. The paper describes the basic features of subroutine algorithm for parameters optimization and for efficiency criteria evaluating of a two-stage turbine. This method is intended for use at the preliminary design of a turbine drive. Results of optimization through this method can be applied at the stages of 3D gas-dynamic flow simulation, design and manufacturing of a turbine physical model. The method was tested at preliminary design of an air starter turbine for starting a diesel engine in cold climatic conditions. Validation of the method was carried out by comparing the results of optimization calculations and numerical gas-dynamic simulation in the Ansys CFX package. The results indicate a sufficient accuracy of the developed method for selection of two-stage turbine parameters.

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Frey, Michael R. „Staged quantum energy teleportation“. In SPIE Sensing Technology + Applications, herausgegeben von Eric Donkor, Andrew R. Pirich und Michael Hayduk. SPIE, 2015. http://dx.doi.org/10.1117/12.2192999.

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Berichte der Organisationen zum Thema "Stange energi"

Sunnercrantz, Liv. The impact of the Russia–Ukraine war on right-wing populism in Norway. European Center for Populism Studies (ECPS), März 2023. http://dx.doi.org/10.55271/rp0025.

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The political right-wing populism topography in Norway has for decades been dominated by the Norwegian Progress Party, which is characterized by a combination of social-conservative values like nativism combined with market liberalism. However, following the invasion of Ukraine, it is not issues of security and sovereignty that take centre stage in the Progress Party’s discourse but high energy prices. As a fossil fuel producer, Norway profits from the ensuing energy crisis and Europe’s search for other energy providers than Russia. These profits, the Progress Party argues, are unduly awarded to the state treasury while “ordinary people” and entrepreneurs struggle. Populism thus appears in Norway as a way for a right-wing opposition party to challenge the centre-left government.

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Angulo Rodríguez, Emilio, und Ariel Yépez-García. The Role of Natural Gas in Energy Transition. Inter-American Development Bank, November 2020. http://dx.doi.org/10.18235/0002868.

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As of 2004 and continuously to this day, the annual growth rate of renewable sources has been greater than that of all fossil fuels combined. In the midst of this transition to cleaner energy, natural gas is the only fossil fuel that has increased its share in the global energy matrix. Technological changes in the LNG supply chain, as well as transformations in the global natural gas market, largely explain this growth. This publication provides evidence on the fundamental role that natural gas plays in the energy transition, given that: (i) its greenhouse gas emissions are substantially lower than those of oil and coal; (ii) it provides the firm power necessary to complement intermittent renewable energies; (iii) it is particularly safe compared to other fossil fuels. In line with these attributes, the International Energy Agency projects that the share of natural gas in the global energy matrix by 2040 will remain stable (around 24%), even in its Sustainable Development Scenario, which would allow to meet the goals established in the Paris Agreement.

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Lantz, Eric, und Elizabeth Doris. State Clean Energy Practices. Renewable Energy Rebates. Office of Scientific and Technical Information (OSTI), März 2009. http://dx.doi.org/10.2172/1219297.

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Hennessy, Daniel, Rodica Sibisan und Mike Rasmussen. Solid State Energy Conversion Energy Alliance (SECA). Office of Scientific and Technical Information (OSTI), September 2011. http://dx.doi.org/10.2172/1084473.

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Lantz, E., und E. Doris. State Clean Energy Practices: Renewable Energy Rebates. Office of Scientific and Technical Information (OSTI), März 2009. http://dx.doi.org/10.2172/950149.

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Phillips, J., M. Finster, J. Pillon, F. Petit und J. Trail. State Energy Resilience Framework. Office of Scientific and Technical Information (OSTI), Dezember 2016. http://dx.doi.org/10.2172/1344905.

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Miguel Cardemil, José, Alan Pino, Allan Starke, Ignacio Calderón-Vásquez, Ian Wolde, Carlos Felbol, Leonardo F. L. Lemos et al. Guidelines for Simulation Tools and Monitoring the Performance of SHIP Systems. IEA SHC Task 64, Juni 2024. http://dx.doi.org/10.18777/ieashc-task64-2024-0004.

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The integration of solar thermal technologies into the industrial sector represents a significant move toward sustainable energy utilization. This report presents a comprehensive analysis of various methodologies regarding the design, implementation, and operational management of solar thermal plants. The focus of this analysis encompasses a broad spectrum of approaches that are fundamental to optimizing the efficiency and effectiveness of these renewable energy systems. This document presents the most significant outcomes of the second stage of Subtask C: Simulation and Design Tools, specifically Task 64/IV, jointly developed under the framework of the International Energy Agency's Solar Heating and Cooling Programme and SolarPACES. Throughout the four-year execution of the Task, Subtask C brought together 50 participants from academia, applied research, and project developers from 15 countries. The combination of state-of-the-art research, existing technical documentation, and on-the-ground experience of project developers adds value to the outcomes of this analysis.

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McAdams, Jasmine. State Energy Justice Roundtable Series: Energy Justice Metrics. Office of Scientific and Technical Information (OSTI), Februar 2023. http://dx.doi.org/10.2172/2229147.

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Gentry, W. R. State-to-state dynamics of molecular energy transfer. Office of Scientific and Technical Information (OSTI), Oktober 1991. http://dx.doi.org/10.2172/5101935.

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