Artykuły w czasopismach: „COMPRESSION-ABSORPTION SYSTEM”

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Fernández-Seara, José, Jaime Sieres i Manuel Vázquez. "Compression–absorption cascade refrigeration system". Applied Thermal Engineering 26, nr 5-6 (kwiecień 2006): 502–12. http://dx.doi.org/10.1016/j.applthermaleng.2005.07.015.

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Jain, Vaibhav. "A Review of Vapor Compression-Absorption Integrated Refrigeration Systems". International Journal of Advance Research and Innovation 6, nr 2 (2018): 35–43. http://dx.doi.org/10.51976/ijari.621807.

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This paper provides a literature review on vapor compression-absorption integrated refrigeration systems. A number of research options are suggested by researchers to integrate vapor compression refrigeration system (VCRS) with vapor absorption refrigeration system (VARS). Each way has its own pros and cons. Present work provides a detailed review on working, parametric study, advantages and disadvantages of various configurations of vapor compression-absorption integrated refrigeration systems.

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Chen, Li-Ping, Liang Cai, Xiao Zhang, Xiao Xu i Jing-Yi Qiao. "Hybrid electric vehicle absorption-compression refrigeration system". IOP Conference Series: Earth and Environmental Science 199 (19.12.2018): 032072. http://dx.doi.org/10.1088/1755-1315/199/3/032072.

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Ramesh kumar, A., i . "Thermodynamic Analysis of Hybrid Absorption Compression System". International Journal of Engineering & Technology 7, nr 3.34 (1.09.2018): 445. http://dx.doi.org/10.14419/ijet.v7i3.34.19356.

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The Virtual Reality realistic image content is a technology to enable building imaginary space by This paper presents thermodynamic studies conducted on a GAX hybrid absorption-compression (HYBRID) cycle using ammonia-water as working ﬂuid for air-conditioning applications. The effect of generator, condenser and absorber temperatures on exergy destruction has been investigated. The effect of absorber pressure on the exergy destruction of the cycle has also been studied. It is found that generator and absorber are the major contributors in the total exergy destruction of the hybrid cycle. Comparison of hybrid cycle with conventional GAX cycle shows hybrid cycle has lower value of exergy destruction than the conventional GAX cycle. It is also found that at same thermal conditions assumed in this work the hybrid cycle gives 18 percent increases in average exergetic efficiency when compared to the conventional GAX cycle.

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Agarwal, Shyam, B. B. Arora i Akhilesh Arora. "Thermodynamic Analysis Of vapour-Absorption (H2O- LiBr)-Compression Combined Refrigeration System Energized Bya Microgas-Turbine". International Journal of Advance Research and Innovation 6, nr 4 (2018): 130–36. http://dx.doi.org/10.51976/ijari.641815.

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The current analysis comprises the configuration of combined refrigeration system which is integration of a vapour compression and vapour absorption system. The integrated system is energized by a microgas turbine to generate cooling at the low temperatures. The waste heat from the exhaust of microgas turbine is used to drive the vapour absorption system while the vapour compression system is directly powered by the small gas turbine. The compression system is at the low temperature stage while the absorption system is at high temperature stage boost the performance of compression system. A computational thermodynamic analysis of the combined system is carried out using mass energy governing equations. It has been concluded on the basis of result obtained that the performance of combined refrigeration systems is higher and less energy consuming.

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Ramanathan, Anand, i Prabhakaran Gunasekaran. "Simulation of absorption refrigeration system for automobile application". Thermal Science 12, nr 3 (2008): 5–13. http://dx.doi.org/10.2298/tsci0803005r.

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An automotive air-conditioning system based on absorption refrigeration cycle has been simulated. This waste heat driven vapor absorption refrigeration system is one alternate to the currently used vapour compression refrigeration system for automotive air-conditioning. Performance analysis of vapor absorption refrigeration system has been done by developing a steady-state simulation model to find the limitation of the proposed system. The water-lithium bromide pair is used as a working mixture for its favorable thermodynamic and transport properties compared to the conventional refrigerants utilized in vapor compression refrigeration applications. The pump power required for the proposed vapor absorption refrigeration system was found lesser than the power required to operate the compressor used in the conventional vapor compression refrigeration system. A possible arrangement of the absorption system for automobile application is proposed.

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Putra, Nandy, H. Ardiyansya, Ridho Irwansyah, Wayan Nata Septiadi, A. Adiwinata, A. Renaldi i K. Benediktus. "Thermoelectric Heat Pipe-Based Refrigerator: System Development and Comparison with Thermoelectric, Absorption and Vapor Compression Refrigerators". Advanced Materials Research 651 (styczeń 2013): 736–44. http://dx.doi.org/10.4028/www.scientific.net/amr.651.736.

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Thermoelectric coolers have been widely applied to provide cooling for refrigerators in addition to conventional absorption and vapor compression systems. To increase heat dissipation in the thermoelectric cooler’s modules, a heat pipe can be installed in the system. The aim of this study is to develop a thermoelectric heat pipe-based (THP) refrigerator, which consists of thermoelectric coolers that are connected by heat pipe modules to enhance heat transfer. A comparative analysis of the THP prototype and conventional refrigerator with vapor compression, absorption and thermoelectric systems is also presented. The prototype system has a faster cooling down time and a higher coefficient of performance than the absorption system but still lower than vapor compression system

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Wang, Lin, Shuang Ping Duan i Xiao Long Cui. "Performance Analysis of Solar-Assisted Refrigeration Cycle". Applied Mechanics and Materials 170-173 (maj 2012): 2504–7. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2504.

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Energy-conservation and environmental protection are keys to sustainable development of domestic economy. The solar-assisted cascade refrigeration cycle system is developed. The system consists of electricity-driven vapor compression refrigeration system and solar-driven vapor absorption refrigeration system. The vapor compression refrigeration system is connected in series with vapor absorption refrigeration system. Refrigerant and solution reservoirs are designed to store potential to keep the system operating continuously without sunlight. The results indicate that the system obtains pretty higher COP as compared with the conventional vapor compression refrigeration system. COP of the new-type vapor compression refrigeration system increases as sunlight becomes intense.

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Xu, Yingjie, FuSheng Chen, Qin Wang, Xiaohong Han, Dahong Li i Guangming Chen. "A novel low-temperature absorption–compression cascade refrigeration system". Applied Thermal Engineering 75 (styczeń 2015): 504–12. http://dx.doi.org/10.1016/j.applthermaleng.2014.10.043.

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Ye, Bicui, Shufei Sun i Zheng Wang. "Potential for Energy Utilization of Air Compression Section Using an Open Absorption Refrigeration System". Applied Sciences 12, nr 13 (23.06.2022): 6373. http://dx.doi.org/10.3390/app12136373.

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In this paper, an open absorption refrigeration system is proposed to recover part of the waste compression heat while producing cooling capacity to further cool the compressed air itself. The self-utilization of the compression waste heat can significantly reduce the energy consumption of air compression, and hence increase the energy efficiency of the cryogenic air separation unit. To illuminate the energy distribution and energy conversion principle of the open absorption refrigerator-assisted air compression section, a thermodynamic model is built and the simulation work conducted based on a practical triple-stage air compression section of a middle-scale cryogenic air separation unit. Our results indicate that the energy saving ratio is mainly constrained by the distribution of the cooling load of compressed air, which corresponds to the heat load of the generator and cooling capacity of the evaporator in the open absorption refrigerator. The energy saving ratio ranges from 0.52–8.05%, corresponding to the temperature range of 5–30 °C and humidity range of 0.002–0.010 kg/kg. It is also estimated, based on the economic analysis, that the payback period of the open absorption refrigeration system is less than one year, and the net project revenue during its life cycle reaches USD 5.7 M, thus showing an attractive economic potential.

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Mussati, Sergio F., Tatiana Morosuk i Miguel C. Mussati. "Superstructure-Based Optimization of Vapor Compression-Absorption Cascade Refrigeration Systems". Entropy 22, nr 4 (10.04.2020): 428. http://dx.doi.org/10.3390/e22040428.

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A system that combines a vapor compression refrigeration system (VCRS) with a vapor absorption refrigeration system (VARS) merges the advantages of both processes, resulting in a more cost-effective system. In such a cascade system, the electrical power for VCRS and the heat energy for VARS can be significantly reduced, resulting in a coefficient of performance (COP) value higher than the value of each system operating in standalone mode. A previously developed optimization model of a series flow double-effect H2O-LiBr VARS is extended to a superstructure-based optimization model to embed several possible configurations. This model is coupled to an R134a VCRS model. The problem consists in finding the optimal configuration of the cascade system and the sizes and operating conditions of all system components that minimize the total heat transfer area of the system, while satisfying given design specifications (evaporator temperature and refrigeration capacity of −17.0 °C and 50.0 kW, respectively), and using steam at 130 °C, by applying mathematical programming methods. The obtained configuration is different from those reported for combinations of double-effect H2O-LiBr VAR and VCR systems. The obtained optimal configuration is compared to the available data. The obtained total heat transfer area is around 7.3% smaller than that of the reference case.

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Wang, Ze, Honghong Shen, Qunyin Gu, Daoyuan Wen, Gang Liu, Weijun Gao i Jianxing Ren. "Economic Analysis of Heat Pump Recovery System for Circulating Water Waste Heat in Power Plant". E3S Web of Conferences 256 (2021): 02011. http://dx.doi.org/10.1051/e3sconf/202125602011.

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The use of heat pump technology to recover the waste heat of circulating water from the power plant instead of steam extraction for heating can not only improve the thermal efficiency of the unit and reduce the loss of cold source, but also has great advantages in energy saving. This paper uses absorption and compression heat pumps to recover the waste heat of circulating water in the power plant to study its energy-saving benefits. Under the same heating load, the economics of the two heat pumps are calculated and analyzed. The results show that the energy-saving benefits of absorption heat pump units are far greater than compression units. But in terms of water saving, the water saving capacity of the compression heat pump unit is higher than that of the absorption heat pump.

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Pandey, Navneet Kumar, i V. K. Bajpai. "Effect of operating variables on modified compression-absorption refrigeration system". i-manager's Journal on Mechanical Engineering 4, nr 2 (15.04.2014): 38–43. http://dx.doi.org/10.26634/jme.4.2.2684.

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SACHDEVA, GULSHAN, VAIBHAV JAIN i S. S. KACHHWAHA. "EXERGY ANALYSIS OF A VAPOR COMPRESSION–VAPOR ABSORPTION CASCADE SYSTEM". International Journal of Air-Conditioning and Refrigeration 21, nr 04 (grudzień 2013): 1350026. http://dx.doi.org/10.1142/s2010132513500260.

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In this paper, second law analysis has been done for the vapor compression–vapor absorption (VC–VA) cascade system. Ammonia–water is considered as the working pair in absorption section and R407C is dealt as the working fluid in VC section. Exergy destruction or the irreversibility rate is determined in each components of VC–VA cascade system, for a wide range of cooling capacity by considering a variable speed reciprocating compressor. Further in this, Coefficient of structural bond (CSB) analysis is carried out to quantify the effect of varying the generator temperature, effectiveness of solution heat exchanger, inlet temperature of external fluids in evaporator/condenser and some other variables. Solution heat exchanger and the condenser are reported to have high CSB value, so have a great scope of improvement to reduce the irreversibility rate of the whole system.

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Yu, Jianting, Zeyu Li, Erjian Chen, Yongrui Xu, Hongkai Chen i Le Wang. "Experimental assessment of solar absorption-subcooled compression hybrid cooling system". Solar Energy 185 (czerwiec 2019): 245–54. http://dx.doi.org/10.1016/j.solener.2019.04.055.

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Li, Zeyu, Liming Liu i Yue Jing. "Exergoeconomic analysis of solar absorption-subcooled compression hybrid cooling system". Energy Conversion and Management 144 (lipiec 2017): 205–16. http://dx.doi.org/10.1016/j.enconman.2017.04.052.

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Pratihar, A. K., S. C. Kaushik i R. S. Agarwal. "Performance evaluation of a small capacity compression–absorption refrigeration system". Applied Thermal Engineering 42 (wrzesień 2012): 41–48. http://dx.doi.org/10.1016/j.applthermaleng.2012.03.011.

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Colorado, D., i V. M. Velázquez. "Exergy analysis of a compression-absorption cascade system for refrigeration". International Journal of Energy Research 37, nr 14 (27.02.2013): 1851–65. http://dx.doi.org/10.1002/er.3012.

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Herrera-Romero, JV, i Dario Colorado-Garrido. "Comparative Study of a Compression–Absorption Cascade System Operating with NH3-LiNO3, NH3-NaSCN, NH3-H2O, and R134a as Working Fluids". Processes 8, nr 7 (10.07.2020): 816. http://dx.doi.org/10.3390/pr8070816.

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This research presents a comprehensive bibliographic review from 2006 through 2020 about the state of the art of the compression–absorption cascade systems for refrigeration. In consequence of this review, this research identifies the significant development of systems that consider lithium bromide as a working fluid; however, the use of other working fluids has not been developed. This study is motivated toward the development of a parametric analysis of the cascade system using NH3-LiNO3, NH3-NaSCN and NH3-H2O in the absorption cycle and R134a in the compression cycle. In this study, the effect of the heat source temperature, condensation temperature in the compression cycle, the use of heat exchangers in the system (also known as economizers) and their contribution to the coefficient of performance is deepened numerically. The economizers evaluated are the following: an internal heat exchanger, a refrigerant heat exchanger, a solution refrigerant heat exchanger, and a solution heat exchanger. Mass and energy balance equations—appropriate equations to estimate the thermophysical properties of several refrigerant–absorbent pairs—were used to develop a thermodynamic model. The studied heat source temperature range was from 355 to 380 K, and the studied condensation temperature range in the compression cycle was from 281 to –291 K; additionally, the importance of each economizer on the coefficient of performance was numerically estimated. In this way, NH3-NaSCN solution in the absorption cycle and R134a in the compression cycle provided promising numerical results with the highest COPs (coefficient of performance).

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SACHDEVA, GULSHAN, VAIBHAV JAIN i S. S. KACHHWAHA. "ENERGY ANALYSIS OF A VAPOR COMPRESSION SYSTEM CASCADED WITH AMMONIA–WATER ABSORPTION SYSTEM". International Journal of Air-Conditioning and Refrigeration 22, nr 01 (marzec 2014): 1450007. http://dx.doi.org/10.1142/s2010132514500072.

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The first law analysis of a vapor compression–vapor absorption (VC–VA) cascade system is carried out for a wide range of cooling capacity. While ammonia–water is the working pair in VA section, R407C is used in VC section. The influences of change in cooling capacity, superheating and subcooling in the condenser, temperature in the generator, degree of overlap in cascade condenser, size of the heat exchangers etc. on the system performance are investigated. It is concluded that the COP of the VC section of the cascade system could be improved by 146% and the electricity consumption could be reduced by 64% compared to an equivalent VC unit. Separately the results showed the considerable increase in the generator heat when cooling capacity was increased from 83.33 kW. The COP of the cascade system at high cooling capacity is strongly dependent on the performance of condenser.

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Tran, TrongNhan, Arameh Eyvazian, Quirino Estrada, DucHieu Le, NhatTan Nguyen i HuuSon Le. "Lateral Behaviors of Nested Tube Systems Under Quasi-Static Condition". International Journal of Applied Mechanics 12, nr 04 (maj 2020): 2050046. http://dx.doi.org/10.1142/s1758825120500465.

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A study is made to investigate the compression behavior of different nested tube systems made of mild steel under lateral compression. The nested tube systems including stacked groups of circular, rectangular and square tubes are built for application in narrow compressive zones. The deformation mode of these systems is observed and their lateral compression behavior are identified. The desirable stepwise energy absorption is obtained by designing the nested tube system. The load response revealed that there is no appearance of the peak compressive load in the case of a circular-circular tube (CCT) system, while a circular-rectangular tube (CRT) system offers bigger peak compressive load compared with that of a circular-square tube (CST). The energy absorptions of CCT and CRT systems are smallest and greatest, respectively. This study also estimates the energy absorption capacity of these system. By implementing the “plastic hinge line” concept of the modified simplified super folding element (MSSFE) theory and superposition principle, the analytical models predicting compressive load of the nested tube systems are introduced. The analytical investigations are compared with the data obtained from tests on these systems. Excellent correlation is observed between the theoretical and experimental data.

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Li, Qingyang, Shiqi Zhao, Dechang Wang, Qinglu Song, Sai Zhou, Xiaohe Wang i Yanhui Li. "Simulation Study on Solar Single/Double-Effect Switching LiBr-H2O Absorption Refrigeration System". Energies 16, nr 7 (3.04.2023): 3220. http://dx.doi.org/10.3390/en16073220.

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In this study, a solar single/double-effect switching LiBr-H2O absorption refrigeration system was investigated to make full use of solar energy and give full play to the advantages of solar refrigeration systems. A corresponding thermodynamic dynamic mathematical model was developed. The operation characteristics of the system operating continuously for one week were analyzed. In order to highlight the advantages of the solar single/double-effect switching absorption refrigeration system, it was compared with other forms of solar refrigeration systems and compression refrigeration systems. The practical application potential of the single/double-effect switching LiBr-H2O absorption refrigeration system was evaluated from the perspective of economy and environmental effect. The results showed that the system could achieve the switching operation between single-effect mode and double-effect mode under weather conditions of high solar radiation intensity, and the daily cooling efficiency on such days was relatively high. After an auxiliary heater was added, the primary energy savings of the solar single/double-effect switching LiBr-H2O absorption refrigeration system were 25–52%, depending on the area of the collector and the volume of the storage tank. The solar fraction of the system was about 71.99% for continuous operation during the whole refrigeration season. However, the initial investment cost of the system equipment accounted for 89.66% of the total cost. Compared with the traditional compression refrigeration system, the initial investment cost of the solar single/double-effect switching LiBr-H2O absorption refrigeration system was higher, but it had a better environmental protection effect.

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Bellos, Evangelos, i Christos Tzivanidis. "CO2 Transcritical Refrigeration Cycle with Dedicated Subcooling: Mechanical Compression vs. Absorption Chiller". Applied Sciences 9, nr 8 (18.04.2019): 1605. http://dx.doi.org/10.3390/app9081605.

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The objective of this paper is the comparison of two dedicated subcooling methods, after the gas cooler, in a CO2 transcritical refrigeration system. The use of vapor compression refrigeration with R134a for subcooling is the first method, and the second is the use of an absorption chiller that operates with a LiBr-H2O working pair. The examined systems are compared energetically and exegetically with the reference transcritical CO2 refrigeration cycle without subcooling. The analysis is conducted for different operating scenarios and in every case, the system is optimized by selecting the proper temperature and pressure levels. The analysis is performed with a developed and validated model in Engineering Equation Solver. According to the final results, the use of the absorption chiller is able to decrease the system electricity consumption by about 54% compared to the simple transcritical cycle, while the decrease with the mechanical subcooling is 41%. Both systems with dedicated subcooling are found to have an important increase in the system exergy performance compared to the simple transcritical cycle. However, the system with the mechanical subcooling is found to be the best choice exegetically, with a small difference from the system with the absorption chiller.

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Li, Zeyu, Jianting Yu, Erjian Chen i Yue Jing. "Off-Design Modeling and Simulation of Solar Absorption-Subcooled Compression Hybrid Cooling System". Applied Sciences 8, nr 12 (13.12.2018): 2612. http://dx.doi.org/10.3390/app8122612.

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The solar absorption-subcooled compression hybrid cooling system (SASCHCS) is potentially an economical solution for high-rise buildings. The hybrid system is subjected to off-design operation frequently, owing to the changes in solar irradiance and cooling demand. However, a large amount of iterations and difficult convergence are encountered in the traditional off-design modeling. Hence, our present study contributes to the development of an off-design model that is exact and can be solved conveniently. A novel modeling method based on the combination of an absorption subsystem described by the characteristic equation and a compression subsystem modeled by the lumped parameter method is proposed. A prototype and corresponding experimental system are developed to verify the model. A good agreement between the theoretical result and test data is displayed. The maximum deviation is less than 4%. Subsequently, the performance of the facility for different operating conditions is simulated and analyzed. We found that the subcooling power relies significantly on the compressor speed, i.e., a reduction by 58.6% when the compressor speed reduces by 80%. In addition, a high temperature and low flow rate of cooling water in the compression subsystem is adverse to the performance of the hybrid system. Our study can serve as the foundation for the operational analysis of the solar absorption-subcooled compression hybrid cooling system as well as promote its development.

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Chen, Yi, Wei Han i Hongguang Jin. "Analysis of an absorption/absorption–compression refrigeration system for heat sources with large temperature change". Energy Conversion and Management 113 (kwiecień 2016): 153–64. http://dx.doi.org/10.1016/j.enconman.2016.01.063.

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Liang, Youcai, Zhibin Yu i Wenguang Li. "A Waste Heat-Driven Cooling System Based on Combined Organic Rankine and Vapour Compression Refrigeration Cycles". Applied Sciences 9, nr 20 (11.10.2019): 4242. http://dx.doi.org/10.3390/app9204242.

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In this paper, a heat driven cooling system that essentially integrated an organic Rankine cycle power plant with a vapour compression cycle refrigerator was investigated, aiming to provide an alternative to absorption refrigeration systems. The organic Rankine cycle (ORC) subsystem recovered energy from the exhaust gases of internal combustion engines to produce mechanical power. Through a transmission unit, the produced mechanical power was directly used to drive the compressor of the vapour compression cycle system to produce a refrigeration effect. Unlike the bulky vapour absorption cooling system, both the ORC power plant and vapour compression refrigerator could be scaled down to a few kilowatts, opening the possibility for developing a small-scale waste heat-driven cooling system that can be widely applied for waste heat recovery from large internal combustion engines of refrigerated ships, lorries, and trains. In this paper, a model was firstly established to simulate the proposed concept, on the basis of which it was optimized to identify the optimum operation condition. The results showed that the proposed concept is very promising for the development of heat-driven cooling systems for recovering waste heat from internal combustion engines’ exhaust gas.

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Kairouani, L., i E. Nehdi. "Thermodynamic Analysis of an Absorption/Compression Refrigeration System Using Geothermal Energy". American Journal of Applied Sciences 2, nr 5 (1.05.2005): 914–19. http://dx.doi.org/10.3844/ajassp.2005.914.919.

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Shaikh, Aamir, Abdul Ghafoor Memon, Aakash Deep i Tahwer Hussain. "Thermodynamic Analysis of Combined Vapor Compression and Vapor Absorption Refrigeration System". Mehran University Research Journal of Engineering and Technology 36, nr 3 (1.07.2017): 733–40. http://dx.doi.org/10.22581/muet1982.1703.27.

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Sun, Xiaojing, Linlin Liu, Yu Zhuang, Lei Zhang i Jian Du. "Heat Exchanger Network Synthesis Integrated with Compression–Absorption Cascade Refrigeration System". Processes 8, nr 2 (9.02.2020): 210. http://dx.doi.org/10.3390/pr8020210.

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Compression–absorption cascade refrigeration system (CACRS) is the extension of absorption refrigeration system, which can be utilized to recover excess heat of heat exchanger networks (HENs) and compensate refrigeration demand. In this work, a stage-wise superstructure is presented to integrate the generation and evaporation processes of CACRS within HEN, where the generator is driven by hot process streams, and the evaporation processes provide cooling energy to HEN. Considering that the operating condition of CACRS has significant effect on the coefficient of performance (COP) of CACRS and so do the structure of HEN, CACRS and HEN are considered as a whole system in this study, where the operating condition and performance of CACRS and the structure of HEN are optimized simultaneously. The quantitative relationship between COP and operating variables of CACRS is determined by process simulation and data fitting. To accomplish the optimal design purpose, a mixed integer non-linear programming (MINLP) model is formulated according to the proposed superstructure, with the objective of minimizing total annual cost (TAC). At last, two case studies are presented to demonstrate that desired HEN can be achieved by applying the proposed method, and the results show that the integrated HEN-CACRS system is capable to utilize energy reasonably and reduce the total annualized cost by 38.6% and 37.9% respectively since it could recover waste heat from hot process stream to produce the cooling energy required by the system.

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Angrisani, G., M. Canelli, C. Roselli, A. Russo, M. Sasso i F. Tariello. "A small scale polygeneration system based on compression/absorption heat pump". Applied Thermal Engineering 114 (marzec 2017): 1393–402. http://dx.doi.org/10.1016/j.applthermaleng.2016.10.048.

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Jain, Vaibhav, S. S. Kachhwaha i Gulshan Sachdeva. "Thermodynamic performance analysis of a vapor compression–absorption cascaded refrigeration system". Energy Conversion and Management 75 (listopad 2013): 685–700. http://dx.doi.org/10.1016/j.enconman.2013.08.024.

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He, Hui, Lin Wang, Junfei Yuan, Zhanwei Wang, Wenxuan Fu i Kunfeng Liang. "Performance evaluation of solar absorption-compression cascade refrigeration system with an integrated air-cooled compression cycle". Energy Conversion and Management 201 (grudzień 2019): 112153. http://dx.doi.org/10.1016/j.enconman.2019.112153.

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Carvalho, F. N., i P. E. L. Barbieri. "Thermoeconomic Simulation of Cascaded and Integrated Vapor Compression-Absorption Refrigeration Systems". Revista de Engenharia Térmica 20, nr 1 (12.04.2021): 93. http://dx.doi.org/10.5380/reterm.v20i1.80463.

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The present work is composed by a comparative thermoeconomic analysisbetween two refrigeration systems: Vapor Compression CascadeRefrigeration System (VCCRS) and Integrated Refrigeration System byAbsorption and Vapor Compression (VCACRS). The thermoeconomicanalysis compares the systems under energy, exergy, economic andenvironmental aspects. The development of mathematical models for each ofthe systems is performed through the EES (Engineering Equation Solver)program. The optimized functions are exergy destruction and total cost rate(sum of cost rates of investment, operation, maintenance and enviromental)by minimizing these functions. The optimization method used is theweighted sum of the objectives, this can be achieved by assigning differentweights for each goal, then a new function that represents the linearrelationship between all the objectives is found. In present case the twoobjective functions are exergy destruction and total cost rate. Inmultiobjective optimization, the process of choosing among optimizedsolutions involves the definition of an equilibrium point, also called theideal point. In order to achieve a real solution of the minimum values ofthe described functions simultaneously one must determine which is thesmallest distance from the ideal point to the curve that defines theoptimized solutions. In the study the economical advantage of VCCRS inrelation to VCACRS was demonstrated. VCACRS has a cost 10.26% lowerthan VCCRS while VCCRS has a better exergetic efficiency, with itsdestruction of exergy 38.46% lower than VCACRS.

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Corrêa, G. A., J. A. Souza, C. Prentice-Hernández i L. A. O. Rocha. "THERMODYNAMIC EVALUATION OF A TWO STAGES COMPRESSION REFRIGERATION SYSTEM INTEGRATED TO AN ABSORPTION SYSTEM". Revista de Engenharia Térmica 7, nr 2 (31.12.2008): 72. http://dx.doi.org/10.5380/reterm.v7i2.61781.

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This work is based on the principles of administration, with technical and economic data from a frigorific fishing industry, at analyzing the convenience of integrating to the existing refrigeration system (by vapor compression) a refrigeration system by absorption. By comparing the existing system, and this one integrated with absorption, it was applied a thermodynamic evaluation for a mean frigorific output of 33.43 kW. The profitable result obtained from this evaluation indicated the feasibility of the integrated refrigeration system, with an operation time of up to 25.64 %, less than the existing refrigeration system, enabling a lower amount of time for investment return than five years. In the evaluation, they were compared the energetic model, associating energy and the operation cost. The highest profitability of integrated system shows, for the system applied in the industry, that by applying such system it contributes to lower the operations costs, with further results of increased in the product offer, and competitiveness in marketing frigorific items.

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Pethe, Anil M., A. T. Patil, D. R. Telange i A. A. Tatode. "Development and Evaluation of Novel Fast Disintegrating Acetaminophen Tablets". International Journal of Pharmaceutical Sciences and Nanotechnology 8, nr 1 (28.02.2015): 2748–55. http://dx.doi.org/10.37285/ijpsn.2015.8.1.7.

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In this study, attempts were made to design and developed disintegrating drug delivery system, Acetaminophen fast disintegrating tablet (AFDT) by combining super disintegrants and direct compression method. Acetaminophen is widely used as “over the counter” and “common household drug” as analgesic and antipyretic along with poor absorption due to first pass metabolism. So we aimed to use our novel delivery system to achieve rapid absorption in patients like mentally ill, bed ridden and those who do not have easy access to water. The (AFDT) were produced by combining three super disintegrants viz. Croscarmellose, Crospovidone and Sodium starch glycolate in 4% w/w as ratio of (1:1, 1:2, 2:1) using direct compression method. The optimized batch (A3) of tablet were evaluated for post – compression parameters like hardness (4.5 ± 0.75 kg.cm2), friability ((0.76 %), wetting time (42 ± 0.92 sec), water absorption ratio (98.6 %), disintegration time (24.00 ± 0.83 sec.) were found to be acceptable according to standard limits. The in vitro release rate of acetaminophen from (AFDT) was found to be more than that simple formulation in pH (5.8) using USP dissolution test apparatus type-II. These results indicated that, the new (AFDT) formulation system combined advantage of faster release of acetaminophen, which had better effects of rapid oral absorption. Therefore, the AFDT may be used as fast disintegrating delivery system for OTC drug with poor absorption due to first pass metabolism.

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Verma, Abhishek, S. C. Kaushik i S. K. Tyagi. "Thermodynamic Analysis of a Combined Single Effect Vapour Absorption System and tc-CO2 Compression Refrigeration System". HighTech and Innovation Journal 2, nr 2 (1.06.2021): 87–98. http://dx.doi.org/10.28991/hij-2021-02-02-02.

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Transcritical CO2 refrigeration system is coupled with the single effect vapour absorption with LiBr-water as a working pair having an objective to enhance the performance of low temperature transcritical refrigeration system while using natural working pair and to reduce the electricity consumption to produce low temperature refrigeration. The high grade waste heat rejected in the gas cooler of tc-CO2 compression refrigeration system (TCRS) is utilized to run the single effect vapour absorption system (SEVAR) to enhance the energy efficiency of the system. The gas cooler in the transcritical CO2 system is having heat energy at high temperature and pressure, which is utilized to run the vapour absorption system, while the other refrigerant heat exchanger provides subcooling to further enhance the performance. The combined cycle can provide refrigeration temperature at different levels, to use it for different applications. Energetic and exergetic analysis have been done to analyze the combined system to compute the performance parameters and the irreversibilities occurring in different components to further increase the performance. The combined system is optimized for various heat rejection and refrigeration temperatures. The COP of the combined system has been enhanced by to 24.88% while the enhancement in exergetic efficiency (ηex) is observed as 10.14% respectively over tradition transcritical CO2 compression refrigeration system, with -10°C as an evaporation (TCRS cooling) temperature and exit temperature of gas cooler T4 being 40°C. Doi: 10.28991/HIJ-2021-02-02-02 Full Text: PDF

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Kolbaya, Sofia, Tatiana Simankina i Viktor Albrekht. "Feasibility Study of the Absorption Chiller Integration". Applied Mechanics and Materials 725-726 (styczeń 2015): 1273–78. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.1273.

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Paper presents feasibility study of the absorption chiller integration. In the search model system of air conditioning uses absorption chiller instead of the standard vapor compression chiller due to the fact of insufficient electrical supply of the building. Calculated payback periods show limits of the effective applying of the absorption chiller.

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Okafor, Victor. "THERMODYNAMIC ANALYSIS OF COMPRESSOR INLET AIR PRECOOLING TECHNIQUES OF A GAS TURBINE PLANT OPERATIONAL IN NIGERIA ENERGY UTILITY SECTOR". International Journal of Engineering Science Technologies 4, nr 2 (1.04.2020): 13–24. http://dx.doi.org/10.29121/ijoest.v4.i2.2020.74.

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Thermodynamic analysis of inlet air pre-cooling techniques of compressor is among the methods for the enhancement of gas turbine performance. This study compared the effect of using evaporative cooling system pre-cooling method, vapour compression refrigeration precooling and vapour absorption refrigeration precooling techniques to the gas turbine Net Power Output, Thermal efficiency, Thermal Efficiency Change factor (TEC) and Power Gain Ratio (PGR) taking into recognition the prevalent weather and climatic conditions of Nigeria and as well as optimization parameters for the reference system (i.e. without precooling techniques). The results show that at air temperature of 311K, the reference system, evaporative precooling, vapour compression refrigeration and vapour absorption refrigeration precooling methods recorded Net power Outputs of 23.143MW, 25.39MW, 31.84MW and 34.90MW respectively. The Thermal Efficiency Change factor recorded by the precooling systems at an ambient temperature of 311K is 8.68%, 37.4% and 51% respectively.

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Sun, Zhili, Caiyun Wang, Youcai Liang, Huan Sun, Shengchun Liu i Baomin Dai. "Theoretical study on a novel CO2 Two-stage compression refrigeration system with parallel compression and solar absorption partial cascade refrigeration system". Energy Conversion and Management 204 (styczeń 2020): 112278. http://dx.doi.org/10.1016/j.enconman.2019.112278.

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Jain, Vaibhav, Gulshan Sachdeva i S. S. Kachhwaha. "NLP model based thermoeconomic optimization of vapor compression–absorption cascaded refrigeration system". Energy Conversion and Management 93 (marzec 2015): 49–62. http://dx.doi.org/10.1016/j.enconman.2014.12.095.

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Li, Zeyu, i Liming Liu. "Economic and environmental study of solar absorption-subcooled compression hybrid cooling system". International Journal of Sustainable Energy 38, nr 2 (3.01.2018): 123–40. http://dx.doi.org/10.1080/14786451.2017.1422252.

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Dixit, Manoj, Akhilesh Arora i S. C. Kaushik. "Thermodynamic and thermoeconomic analyses of two stage hybrid absorption compression refrigeration system". Applied Thermal Engineering 113 (luty 2017): 120–31. http://dx.doi.org/10.1016/j.applthermaleng.2016.10.206.

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Satapathy, Prasanta Kumar, i M. RamGopal. "Experimental studies on a compression–absorption system for heating and cooling applications". International Journal of Energy Research 32, nr 7 (2008): 595–611. http://dx.doi.org/10.1002/er.1367.

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Satapathy, Prasanta Kumar. "Exergy analysis of a compression-absorption system for heating and cooling applications". International Journal of Energy Research 32, nr 13 (25.10.2008): 1266–78. http://dx.doi.org/10.1002/er.1417.

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Ochiai, Bungo, i Yohei Shimada. "Reversible Gelation System for Hydrazine Based on Polymer Absorbent". Technologies 6, nr 3 (20.08.2018): 80. http://dx.doi.org/10.3390/technologies6030080.

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Reversible absorbents for safe storage of toxic hydrazine were developed. Various cross-linked polar polymers were examined as absorbents for hydrazine and its 35% aqueous solution, and structurally similar polymers were found to be suitable for effective absorption. Namely, cross-linked polyacrylamide (CPAM) was most effective among examined various hydrophilic polymers. CPAM absorbed 43- and 31-fold heavier amounts of absolute hydrazine and 35% aqueous solution, respectively, by simple soaking. Absorbed hydrazine could be quantitatively released either by N2 gas flow and compression, and the resulting absorbent reabsorbed hydrazine without loss of the absorption ability. The absorption ability was higher than conventional covalent storages, and the release protocol, without dissolution of the absorbent, are suitable for storage systems in hydrazine fuel cells.

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46

Wang, Jian, Xianting Li, Baolong Wang, Wei Wu, Pengyuan Song i Wenxing Shi. "Performance Comparison between an Absorption-compression Hybrid Refrigeration System and a Double-effect Absorption Refrigeration Sys-tem". Procedia Engineering 205 (2017): 241–47. http://dx.doi.org/10.1016/j.proeng.2017.09.959.

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Delač, Boris, Branimir Pavković i Vladimir Glažar. "Economic and Energetic Assessment and Comparison of Solar Heating and Cooling Systems". Energies 16, nr 3 (23.01.2023): 1241. http://dx.doi.org/10.3390/en16031241.

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Solar heating and cooling (SHC) systems are currently attracting attention, especially in times of increasing energy prices and supply crises. In times of lower energy prices, absorption SHC systems were not competitive to compression cooling supported by photovoltaic (PV) modules due to the high investment costs and total energy efficiency. This paper aims to discuss the current changes in energy supply and energy prices in terms of the feasibility of the application of a small absorption SHC system in a mild Mediterranean climate. The existing hospital complex restaurant SHC system with evacuated tube solar collectors and a small single-stage absorption chiller was used as a reference system for extended analysis. Dynamic simulation models based on solar thermal collectors, PV modules, absorption chillers and air-to-water heat pumps were developed for reliable research and system comparison. The results showed that primary energy consumption in SHC systems designed to cover base energy load strongly depends on the additional energy source, e.g., boiler or heat pump. Absorption SHC systems can be price competitive to air-to-water heat pump (AWHP) systems with PV collectors only in the case of reduced investment costs and increased electricity price. To reach acceptable economic viability of the absorption SHC system, investment price should be at least equal to or lower than a comparable AWHP system.

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Romage, Guerlin, Cuauhtémoc Jiménez, José de Jesús Reyes, Alejandro Zacarías, Ignacio Carvajal, José Alfredo Jiménez, Jorge Pineda i María Venegas. "Modeling and Simulation of a Hybrid Compression/Absorption Chiller Driven by Stirling Engine and Solar Dish Collector". Applied Sciences 10, nr 24 (17.12.2020): 9018. http://dx.doi.org/10.3390/app10249018.

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In this paper, an evaluation of the performance and operating parameters of a hybrid compression/absorption chiller coupled with a low-capacity solar concentrator is presented. The study was carried out using energy and mass balances applied to each component of each system. The variables evaluated in the hybrid chiller were the cooling power, the supply power, the Coefficient of Performance (COP) of both cooling systems and the ratio between heat and power. The diameter and temperature of the hot spot as well as the performance of the dish collector were evaluated. The changed parameters were the heat removed by each refrigeration system, the condenser temperature, the evaporator temperature, the concentration ratio and the irradiance. Results have shown that the compression system can produce up to 53% more cooling power than the heat supplied to the hybrid system. Meanwhile, the absorption system produces approximately 20% less cooling power than the supplied heat. It has also been found that, for the cooling power produced by the hybrid cooler to be always greater than the heat supplied, the cooling power provided by the absorption system should preferably be between 20% and 60% of the total, with a Stirling engine efficiency between 0.2 and 0.3 and a condensation temperature from 28 to 37 °C. Likewise, it has been found that the compression system can produce cooling power up to 3 times higher than the heat of the Stirling engine hot source, with Th = 200 °C and ηs = 0.3. Finally, it has been found that, in a low-capacity solar concentrator, on a typical day in Mexico City, temperatures in the hot spot between 200 and 400 °C can be reached with measured irradiance values from 200 to 1200 W/m2.

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Boghosian, Ronald, Mostafa Mafi, Mohammad Hassan Panjeshahi i Abtin Ataei. "Variable flow and optimization of chiller loading effect on energy saving for screw vapor compression-single effect absorption hybrid chiller plant in hospital mechanical room ‒ case study: Tehran heart hospital". Mechanics & Industry 22 (2021): 9. http://dx.doi.org/10.1051/meca/2021006.

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Chiller plants are the most energy consuming system during summer season in residential, commercial and hospital buildings. The highly variable cooling demand of the buildings connected to a hybrid chiller plant included absorption and vapor compression chillers to achieve higher energy efficiencies is one of the important issues. Cooling load sharing strategies and apply the variable water flow system in chiller plant have a significant impact on energy consumption and consequently with more productivity and environmentally protected. This paper examines the behavior and pattern of energy consumption in a hybrid chiller plant that includes a combination of two air-cooled screw vapor compression and three single effect absorption chillers. In order to properly understand the pattern of energy consumption, an existing mechanical room in a hospital in Tehran has been studied for five months, and its energy consumption has been compared with the optimized model. The results indicate that the sequence of the chiller function and the way in which they are placed in the circuit during a partial load, is in highest importance in view point of energy saving also by Applying of variable water flow system for optimized chiller loading the more energy saving is achieved for hybrid absorption and vapor compression chiller plant.

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Sayadi, Sana, Jan Akander, Abolfazl Hayati, Mattias Gustafsson i Mathias Cehlin. "Comparison of Space Cooling Systems from Energy and Economic Perspectives for a Future City District in Sweden". Energies 16, nr 9 (30.04.2023): 3852. http://dx.doi.org/10.3390/en16093852.

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In this study, the performance of different cooling technologies from energy and economic perspectives were evaluated for six different prototype residential Nearly Zero Energy Buildings (NZEBs) within a planned future city district in central Sweden. This was carried out by assessing the primary energy number and life cycle cost analysis (LCCA) for each building model and cooling technology. Projected future climate file representing the 2050s (mid-term future) was employed. Three cooling technologies (district cooling, compression chillers coupled/uncoupled with photovoltaic (PV) systems, and absorption chillers) were evaluated. Based on the results obtained from primary energy number and LCCA, compression chillers with PV systems appeared to be favorable as this technology depicted the least value for primary energy use and LCCA. Compared to compression chillers alone, the primary energy number and the life cycle cost were reduced by 13%, on average. Moreover, the district cooling system was found to be an agreeable choice for buildings with large floor areas from an economic perspective. Apart from these, absorption chillers, utilizing environmentally sustainable district heating, displayed the highest primary energy use and life cycle cost which made them the least favorable choice. However, the reoccurring operational cost from the LCCA was about 60 and 50% of the total life cycle cost for district cooling and absorption chillers, respectively, while this value corresponds to 80% for the compression chillers, showing the high net present value for this technology but sensitive to future electricity prices.

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