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Relevant bibliographies by topics / Cycle à compression de vapeur

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Academic literature on the topic 'Cycle à compression de vapeur'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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Journal articles on the topic "Cycle à compression de vapeur"

1

Zamfirescu, Calin. "MODELING AND OPTIMIZATION OF AN AMMONIA-WATER COMPRESSION-RESORPTION HEAT PUMPS WITH WET COMPRESSION." Transactions of the Canadian Society for Mechanical Engineering 33, no. 1 (March 2009): 75–88. http://dx.doi.org/10.1139/tcsme-2009-0008.

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Wet ammonia-water compression-resorption heat pumps constitute an attractive alternative to the commonly known heat pumps based on Osenbrück cycle because they eliminate the necessity of oil-liquid refrigerant separation. In this respect, a special designed oil-free compressor operating under wet (two-phase) conditions equips the heat pump. The compressor is lubricated by the liquid refrigerant which is carried-out while compressing the vapor. The thermodynamic cycle is located completely inside the two-phase region. In this paper are demonstrated two procedures to optimize the design for COP maximization. It is shown that there is: (i) an optimal choice of the vapor quality at suction, and (ii) an optimal distribution of heat transfer surface between the resorber and the desorber (the total amount of heat transfer surface, being an expression of investment cost, is fixed). The circulating concentration of ammonia has to be chosen such that the minimum pressure in the system is over one bar (to avoid air penetration from the atmosphere) and the maximum pressure is bounded by a technical-economical maximal limit. A general procedure for calculation of the optimal cycle parameters is presented and exemplified for a case with practical relevance. The paper presents only the trends and rough quantitative estimations because the analyzed case is restricted to the ideal isentropic compression. Further research is needed to quantify in detail the effect of compression irreversibility.

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Zhao, Jia Hua, and Jing Hong Ning. "Performance Analysis on Solar Assisted CO₂ Vapor Compression Heat Pump Cycle with an Ejector." Advanced Materials Research 741 (August 2013): 97–103. http://dx.doi.org/10.4028/www.scientific.net/amr.741.97.

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The thermodynamic performances of solar assisted CO2 vapor compression heat pump cycles with an ejector are analyzed and compared with that of conventional CO2 heat pump cycle (named as A cycle). Under the given working conditions, the COP of solar assisted CO2 heat pump cycle with an ejector after compressor cycle (named as C cycle) is much higher than that of CO2 heat pump cycle with an ejector before compressor cycle (named as B cycle) and that of the A cycle because of the lower compressor power of the C cycle. The compressor volume displacement of the C cycle demanded for providing the same heat capacity of gas-cooler is the lowest among the three cycles. So the compressor size of the C cycle is very small and the cost of the C cycle is very less. In the area having rich solar energy resource, it is significant to employ the C cycle for providing space heating by optimizing design ejector and selecting compressor, thus, the performances for this C cycle can be improved greatly. In the area not having rich solar energy resource, the B cycle can be used for providing space heating; the performances can also be improved accordingly.

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Merzvinskas, M., C. Bringhenti, J. T. Tomita, and C. R. de Andrade. "Air conditioning systems for aeronautical applications: a review." Aeronautical Journal 124, no. 1274 (December 27, 2019): 499–532. http://dx.doi.org/10.1017/aer.2019.159.

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ABSTRACTThis paper presents a review of the various aeronautical air conditioning systems that are currently available and discusses possible system configurations in the context of the aeronautical environmental control systems. Descriptions of the standard vapor compression cycle and air cycles are provided. The latter includes, simple-cycle, bootstrap-cycle, simple-bootstrap cycle (3-wheel) and condensing cycle (4-wheel). Water separation and air recirculation systems are also explored. A comparison between vapor compression cycles and air cycles is provided, as well as a comparison between different air cycles. Air cycle units are far less efficient than vapor compression cycle units, but they are lighter and more reliable for an equivalent cooling capacity. Details regarding the aircraft conceptual design phase along with general criteria for the selection of an air conditioning system are provided. Additionally, industry trends and technological advances are examined. Conclusions are compiled to guide the systems engineer in the search for the most appropriate design for a particular application.

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Ramanathan, Anand, and Prabhakaran Gunasekaran. "Simulation of absorption refrigeration system for automobile application." Thermal Science 12, no. 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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Choe, Jeong, Jongmin Jung, and Yongseok Jeon. "Potential Benefits of Saturation Compression Cycle with Liquid Injection in Showcase Vapor Compression Cycle." Korean Journal of Air-Conditioning and Refrigeration Engineering 33, no. 4 (April 30, 2021): 190–98. http://dx.doi.org/10.6110/kjacr.2021.33.4.190.

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Liang, Youcai, Zhibin Yu, and Wenguang Li. "A Waste Heat-Driven Cooling System Based on Combined Organic Rankine and Vapour Compression Refrigeration Cycles." Applied Sciences 9, no. 20 (October 11, 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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Wang, Lin, Shuang Ping Duan, and Xiao Long Cui. "Performance Analysis of Solar-Assisted Refrigeration Cycle." Applied Mechanics and Materials 170-173 (May 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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Abd-Elhady, M. S., E. Bishara, and M. A. Halim. "Increasing the Cooling Rate of the Vapor Compression Cycle by Heating." International Journal of Air-Conditioning and Refrigeration 29, no. 01 (March 2021): 2150009. http://dx.doi.org/10.1142/s2010132521500097.

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Refrigeration and air conditioning cycles consume a large amount of electrical energy and the shortage in traditional sources of energy is the main reasons for governments to use renewable energy. The most power consuming part in the Vapor Compression Cycle (VCC) is the gas compressor. Therefore, the objective of this research is to increase the cooling rate of the VCC using the same compressor, and that is done by heating the refrigerant coming out from the compressor. The proposed cycle is similar to the VCC except that the compression processes is done in two stages, the first stage via a gas compressor and in the second stage by heating the refrigerant under constant volume. The heating process can be done using solar energy. An experimental setup has been developed to study the influence of heating the refrigerant on the cooling rate of the VCC. The heating process is performed after the compressor, and it is done under constant volume in order to increase the pressure of the refrigerant. Four experiments have been performed; the first experiment is a normal VCC, i.e., without heating, while in the second, third and fourth experiments, the refrigerant has been heated to 50∘C, 100∘C and 150∘C, respectively. It has been found that the cooling power increases with the heating temperature. Heating increases the pressure of the refrigerant in VCC, and consequently increases the mass flow rate of the refrigerant that results in an increase in the refrigeration power for the same compressor power. However, the disadvantage of heating the refrigerant is that it increases the evaporator temperature, which limits the possibility of the VCC to be used in freezing applications.

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Pektezel and Acar. "Energy and Exergy Analysis of Combined Organic Rankine Cycle-Single and Dual Evaporator Vapor Compression Refrigeration Cycle." Applied Sciences 9, no. 23 (November 21, 2019): 5028. http://dx.doi.org/10.3390/app9235028.

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This paper presents energy and exergy analysis of two vapor compression refrigeration cycles powered by organic Rankine cycle. Refrigeration cycle of combined system was designed with single and dual evaporators. R134a, R1234ze(E), R227ea, and R600a fluids were used as working fluids in combined systems. Influences of different parameters such as evaporator, condenser, boiler temperatures, and turbine and compressor isentropic efficiencies on COPsys and ƞex,sys were analyzed. Second law efficiency, degree of thermodynamic perfection, exergy destruction rate, and exergy destruction ratio were detected for each component in systems. R600a was determined as the most efficient working fluid for proposed systems. Both COPsys and ƞex,sys of combined ORC-single evaporator VCR cycle was detected to be higher than the system with dual evaporator.

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Zhao, Lei, Wen-Jian Cai, Xu-dong Ding, and Wei-chung Chang. "Decentralized optimization for vapor compression refrigeration cycle." Applied Thermal Engineering 51, no. 1-2 (March 2013): 753–63. http://dx.doi.org/10.1016/j.applthermaleng.2012.10.001.

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Dissertations / Theses on the topic "Cycle à compression de vapeur"

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Miller, Eric S. "Dynamic Modeling of Vapor Compression Cycle Systems." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337715881.

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Roberti, Giovanni. "Steady-state Modelling of a Vapor Compression Refrigeration Cycle." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19438/.

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In this work a steady-state model of a simple vapor compression refrigeration cycle is presented. All the fundamental components of this system are modeled separately in order to consider them as black boxes that take inputs and convert them into output variables. The heat exchangers are treated as a set of multiple zones, identified by the refrigerant's state, connected in series, in which the heat transfer coefficient (HTC) is constant. A non-linear system of equations is obtained applying the energy balances and the ε-NTU method for each zone in the heat exchangers. A study on the HTC correlations used to connect the length of the zones with the value of the respective HTC is developed. The compressor is modeled using a polynomial function. Some iterative methods for the resolution in Matlab of the models of the components and the machine are presented, focusing on the strategy to decrease the execution time and to increase the accuracy of the results. Finally, all the models are validated through a set of experimental data and the global model is used to make some considerations about the efficiency and the exergy destruction in the plant.

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Ibrahim, G. A. "An investigation into liquid film absorbers for refrigeration systems." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245436.

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4

Yildiz, Seyfettin. "Design And Simulation Of A Vapor Compression Refrigeration Cycle For A Micro Refrigerator." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612133/index.pdf.

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Cooling of electronic equipments has become an important issue as the advances in technology enabled the fabrication of very small devices. The main challenge in cooling is the space limitation. The use of miniature refrigerators seems to be a solution alternative for the cooling problem. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a micro-scale refrigerator. A MATLAB code is developed for the simulations. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. The cycle is successfully completed nearly at the same point where it begins. The cold space temperature, ambient air temperature, condensation and evaporation temperatures, and the evaporator heat load are the predetermined parameters. A fan is used to cool the condenser, and the compressor is selected as isentropic. R-134A is selected as the refrigerant and a simple interpolation code is developed to obtain the thermophysical properties of R-134A. The original design is carried out with an isentropic compressor. For the purpose of comparison, a cycle with a polytropic compressor is also considered. Similarly, two alternative designs for the evaporator are developed and simulated. A second law analysis is performed at the end of the study.

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Oelofse, Stephanus Phillipus. "An investigation into the performance of a Rankine-heat pump combined cycle / Stephanus Phillipus Oelofse." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9185.

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The global growth in electricity consumption and the shortcomings of renewable electricity generation technologies are some of the reasons why it is still relevant to evaluate the performance of power conversion technologies that are used in fossil fuel power stations. The power conversion technology that is widely used in fossil fuel power stations is the Rankine cycle. The goal of this study was to determine if the efficiency of a typical Rankine cycle can be improved by adding a heat pump as a bottoming cycle. Three simulation models were developed to perform this evaluation. The first is a simulation model of a Rankine cycle. A quite detailed Rankine cycle configuration was evaluated. The simulation model was used to determine the heating requirements of the heat pump cycle as well as its operating temperature ranges. The efficiency of this Rankine cycle was calculated as 43.05 %. A basic vapour compression cycle configuration was selected as the heat pump of the combined cycle. A simulation model of the vapour compression cycle and the interfaces with the Rankine cycle was developed as the second simulation model. Working fluids that are typically used in vapour compression cycles cannot be used for this application, due to temperature limitations. The vapour compression cycle’s simulation model was therefore also used to calculate the coefficient of performance (COP) for various working fluids in order to select a suitable working fluid. The best cycle COP (3.015 heating) was obtained with ethanol as working fluid. These simulation models were combined to form the simulation model of the Rankine-heat pump combined cycle. This model was used to evaluate the performance of the combined cycle for two different compressor power sources. This study showed that the concept of using steam turbine or electrical power to drive a compressor driven vapour compression cycle in the configuration proposed here does not improve the overall efficiency of the cycle. The reasons for this were discovered and warrant future investigation.
Thesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2013.

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Sadurní, Caballol Alexandre. "Numerical analysis and experimental studies of vapour compression refrigerating systems: special emphasis on different cycle configurations." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/96980.

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The aim of this work is to study the thermal behavior and fluid-dynamic systems, vapor compression refrigeration and its components (heat exchangers, expansion devices, compressors, connecting pipes, pumps and pressure vessels). Topics discussed throughout this thesis arise from the growing interest in refrigerants friendly environment as well as different types of cooling systems for vapor compression has motivated the research group of the CTTC (Centre for Heat Transfer Technology ) to carry out major research efforts as well as participate in several projects with national and European institutions. The information contained in this thesis represents a summary of work performed by the author in recent years but also includes many of the contributions made by other members of CTTC. This thesis has led to the publication of several articles in international conferences. The main achievement of this thesis was the development of a numerical tool based on several subroutines flexibility to study different cooling Systemas vapor compression. The entire digital infrastructure has been the result of attaching specific numerical resolutions of each element of the cycle with the overall resolution algorithm. The simulations have been oriented to the study of thermodynamic cycle as well as to study some relevant aspects of the elements. In addition to the numerical results has been carried out important experimental work in the CTTC facilities in order to validate numerical models. The author has been fully involved in the process of data acquisition and has collaborated in the development of the units. The thesis is structured into five chapters plus a final conclusions and future actions. The first chapter, the introduction puts the reader in regard to the problematic situation, the history of cooling and objectives. The second presents the mathematical formulation and numerical methodology used in the simulation of the different elements and all cooling systems. The third study presents the numerical code verification. The fourth focuses on the validation of models with experimental results. And finally the fifth presents a suite of parametric studies and analysis. The numerical simulation code implemented has proven to be a flexible tool as various aspects of the steam compression systems have been successfully simulated and studied. It has also proven a reliable and good level of accuracy as the numerical results have been simulated properly the various experimental data compared.

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Schoenfeld, Jonathan Michael. "Integration of a thermoelectric subcooler into a carbon dioxide transcritical vapor compression cycle refrigeration system." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8726.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Mongey, Brian. "The experimental evaluation of a ternary mixture as an alternative to R22 in the vapour compression refrigeration cycle." Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241758.

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Azzouz, Kamel. "Etude d'un système frigorifique domestique à haute inertie thermique avec matériau à changement de phase." Paris 6, 2008. http://www.theses.fr/2008PA066007.

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La part de consommation d’énergie du froid ménager représente 20% de la consommation des usages spécifiques de l’électricité des ménages, ce qui en fait un gisement d’économie d’énergie appréciable dans le résidentiel et qui justifie l’intérêt accru que l’on porte au froid domestique. Ce travail de thèse vise à évaluer l’effet de la mise en œuvre d’un matériau à changement de phase (PCM) dans un réfrigérateur domestique et de développer un outil de simulation qui permet de prédire les performances du système et d’optimiser sa conception. La conception et l’instrumentation d’un prototype de réfrigérateur avec matériau à changement de phase, ont permis d’évaluer les performances d’un tel système en termes d'autonomie et d'efficacité énergétique pour différentes charges thermiques. L’analyse des résultats des essais a mis en lumière l’ensemble des paramètres influençant les performances du système. Afin d’optimiser la conception d’un tel système un modèle dynamique couplant les transferts dans le matériau à changement de phase et cycle à compression de vapeur a été développé et validé expérimentalement. Ce modèle permet d’estimer les évolutions des principaux paramètres de fonctionnement tel que l’autonomie, la température de l’air dans l’enceinte réfrigérée et la consommation d’énergie du système. Les résultats numériques et expérimentaux obtenus montrent une nette réduction des fluctuations de température dans l'enceinte réfrigérée et une amélioration du comportement du système en termes d'autonomie et d'efficacité énergétique.

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Mango, Omar I. K. "The effect of design parameters of compressors on the performance of domestic refrigerators." Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259540.

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Books on the topic "Cycle à compression de vapeur"

1

Domanski, Piotr. Impact of refrigerant property uncertainties on prediction of vapor compression cycle performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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2

Mongey, Brian. The experimental evaluation of a ternary mixture as an alternative to R22 in the vapour compression refrigeration cycle. [S.l: The Author], 1996.

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3

Results of experiments with a fifty horse-power single non-condensing ball and wood engine to determine the influence of compression on the water consumption. [S.l: s.n., 1986.

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4

T, Heppenstall, and Commission of the European Communities. Directorate-General for Science, Research and Development., eds. The development of prototype expert systems for the application of heat exchangers and compression cycle heat pumps in energy conservation. Luxembourg: Commission of the European Communities, 1990.

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The Development of Prototype Expert Systems for the Application of Heat Exchangers and Compression Cycle Heat Pumps in Energy Conservation: Final Report. European Communities / Union (EUR-OP/OOPEC/OPOCE), 1990.

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Book chapters on the topic "Cycle à compression de vapeur"

1

Yin, Xiaohong, Wenjian Cai, Shaoyuan Li, and Xudong Ding. "Control Structure Selection for Vapor Compression Refrigeration Cycle." In Intelligent Computing for Sustainable Energy and Environment, 477–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37105-9_53.

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Agarwal, Priyank, R. Shankar, and T. Srinivas. "Design of Integrated R134a Vapor Compression Heating and Cooling Cycle." In Lecture Notes in Mechanical Engineering, 47–54. India: Springer India, 2012. http://dx.doi.org/10.1007/978-81-322-1007-8_4.

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Agarwal, Shyam, Akhilesh Arora, and B. B. Arora. "Exergy Analysis of Dedicated Mechanically Subcooled Vapour Compression Refrigeration Cycle Using HFC-R134a, HFO-R1234ze and R1234yf." In Lecture Notes in Civil Engineering, 23–42. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7557-6_3.

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Kaushik, Shubhash C., Sudhir K. Tyagi, and Pramod Kumar. "Finite Time Thermodynamics of Vapour Compression Refrigeration, Airconditioning and Heat Pump Cycles." In Finite Time Thermodynamics of Power and Refrigeration Cycles, 149–80. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62812-7_7.

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De Silvestri, Sandro, Mauro Nisoli, Giuseppe Sansone, Salvatore Stagira, and Orazio Svelto. "Few-Cycle Pulses by External Compression." In Topics in Applied Physics, 137–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39849-3_3.

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Staicovici, Mihail-Dan. "External Coabsorbent Cycle Composition." In Coabsorbent and Thermal Recovery Compression Heat Pumping Technologies, 271–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54684-6_6.

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Wang, Hongli, Jingrui Tian, and Huiqin Liu. "Performance Analysis of Transcritical CO2 Compression Cycle." In Communications in Computer and Information Science, 730–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34041-3_101.

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Staicovici, Mihail-Dan. "A Few New Coabsorbent Cycle Configurations: The Internal Composition and the Coabsorbent Cycle Truncation." In Coabsorbent and Thermal Recovery Compression Heat Pumping Technologies, 171–248. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54684-6_4.

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Åhlby, L., and D. Hodgett. "The Compression-Absorption Cycle: A High-Temperature Application." In Applications and Efficiency of Heat Pump Systems, 59–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_6.

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Hauri, C. P., J. P. Rousseau, F. Burgy, G. Chériaux, and R. López-Martens. "Generation of High-energy Few-cycle Pulses by Filament Compression." In Springer Series in Optical Sciences, 473–80. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49119-6_62.

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Conference papers on the topic "Cycle à compression de vapeur"

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Keir, Michael C., and Andrew G. Alleyne. "Feedback Structures for Vapor Compression Cycle Systems." In 2007 American Control Conference. IEEE, 2007. http://dx.doi.org/10.1109/acc.2007.4282743.

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Bilir Sag, N. "Analysis of a Combined Organic Rankine Cycle and Vapor Compression Refrigeration Cycle." In 5th International Conference on Innovation in Science and Technology. acavent, 2018. http://dx.doi.org/10.33422/5ist.2018.12.111.

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Anderson, Kevin R., Thomas Gross, Chris McNamara, and Ariel Gatti. "DESIGN AND ANALYSIS OF A FAME-MLL VAPOR-COMPRESSION REFRIGERATION CYCLE COMPRESSOR." In 4th Thermal and Fluids Engineering Conference. Connecticut: Begellhouse, 2019. http://dx.doi.org/10.1615/tfec2019.ref.026265.

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Kilicarslan, Ali, and Norbert Mu¨ller. "Investigation of Irreversibilities in the Compression Process for Alternative Refrigerants in a Vapor Compression Refrigeration Cycle." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42497.

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Irreversibility analyses during compression process are presented for some refrigerants namely, R290, R134a, R12, R22, and R152a in a vapor compression refrigeration cycle. The effects of evaporator temperature, condenser temperature and isentropic efficiency on the irreversibility rates and exergetic efficiencies of the refrigerants under study are investigated By the means of a computer code that simulates a vapor compression cycle including subcooling and superheating. For all the refrigerants in this study, the irreversibility in the compression process decreased as the evaporator temperature and isentropic efficiency increased and it increased with the increasing values of the condenser temperatures. Exergetic efficiency of the compressor increased as the isentropic efficiency of the compressor increased while it decreased with the increasing values of evaporator temperatures. In the case of increasing evaporator and condenser temperatures, and isentropic efficiency values, R22 and R152a approximately show the same and lowest values of compressor irreversibility while R290 has the lowest values. The compressor irreversibilities and compressor exergetic efficiencies of R12 and R134a placed in the moderate range in the case of increasing evaporator and condenser temperatures, and isentropic efficiency values.

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Kilicarslan, Ali, and Norbert Mu¨ller. "Irreversibility Analysis of a Vapor Compression Cascade Refrigeration Cycle." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66363.

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Hydrocarbon based energy sources such as coal, oil and natural gas have been diminishing in an increasing speed. Instead of finding alternative energy sources, we have to use the available sources more effectively. By means of the irreversibility analysis, we can determine the factors or conditions that cause the inefficiencies in any energy system. In this study, irreversibility analysis of a compression cascade refrigeration cycle that consists of a high and low temperature cycles is presented. In the high temperature cycle, the refrigerants from different classes, namely R12 (CFC), R22 (HCFC), R134a (HFC) and R404a (Azeotropic) are selected as working fluids. In the low temperature cycle, R13 is only used as a working fluid. Irreversibility analysis of refrigerant pairs, namely R12-R13, R22-R13, R134a-R13, and R404a-R13 are carried out in a compression cascade refrigeration cycle by a computer code developed. The effects of evaporator temperature, condenser temperature, and the temperature difference between the saturation temperatures of the lower and higher temperature cycles in the heat exchanger (ΔT) and the polytropic efficiency on irreversibility of the system are investigated. The irreversibility of the cascade refrigeration cycle decreases as the evaporator temperature and polytropic efficiency increase for all of the refrigerant couples considered while the irreversibility increases with the increasing values of the condenser temperature and ΔT. In the whole ranges of evaporator temperature (−65°C / −45°C), condenser temperature (30–50°C), ΔT (2–16K) and polytropic efficiency (%50/%100), the refrigerant pair R12-R13 has the lowest values of irreversibilities while the pair R404a-R13 has the highest ones. At the lower condenser temperature (<30°C) and higher polytropic efficiencies (85%–95%), the refrigerant couples except for R404a-R13 have approximately the same values of irreversibility.

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Zhao, Lei, Wenjian Cai, and Xudong Ding. "Optimization of vapor compression cycle based on genetic algorithm." In 2012 10th International Power & Energy Conference (IPEC). IEEE, 2012. http://dx.doi.org/10.1109/asscc.2012.6523317.

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Soliman, Aly M. A., Sherif H. Taher, Ali K. Abdel-Rahman, and S. Ookawara. "Performance enhancement of vapor compression cycle using nano materials." In 2015 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2015. http://dx.doi.org/10.1109/icrera.2015.7418526.

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Wallace, M., B. Das, P. Mhaskar, J. House, and T. Salsbury. "Offset-free model predictive controller for Vapor Compression Cycle." In 2012 American Control Conference - ACC 2012. IEEE, 2012. http://dx.doi.org/10.1109/acc.2012.6315409.

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Hencey, Brandon, Neera Jain, Bin Li, and Andrew Alleyne. "Decentralized Feedback Structures of a Vapor Compression Cycle System." In ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2213.

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In vapor compression cycle (VCC) systems, it is desirable to effectively control the thermodynamic cycle. By controlling the thermodynamic states of the refrigerant with an inner-loop, supervisory algorithms can manage critical objectives such as maintaining superheat and maximizing the coefficient of performance, etc. In the HVAC industry, it is generally preferred to tune multiple single-input-single-output (SISO) control inner-loops rather than a single multiple-input-multiple-output (MIMO) control inner-loop. This paper presents a process by which a simplified feedback control structure amenable to a decoupled SISO control loop design may be identified. In particular, the many possible candidate input-output pairs for decentralized control are sorted via a decoupling metric, the relative gain array number. From a reduced set of promising candidate input-output pairs, engineering insight is applied to arrive at the final pairings successfully verified on a refrigeration test stand.

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Augusto Goulart Diniz, Hélio, Ivo Zatti Lima Meyer, Glycon Pena de Souza Barros, João Marcos Gomes Vieira, Grack Rodrigues Gama, and Nicolas Cristiano Gomes de Oliveira. "EXPERIMENTAL STUDY OF A VAPOR COMPRESSION CYCLE PERFORMANCE BEHAVIOR." In Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2018. http://dx.doi.org/10.26678/abcm.encit2018.cit18-0689.

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Reports on the topic "Cycle à compression de vapeur"

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Kariya, Arthur, Wayne Staats, Jeffrey P. Koplow, Scott Wujek, Stefan Elbel, and Pega Hrnjak. Rotary Vapor Compression Cycle Final Report. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1426402.

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Kariya, Arthur Harumichi, Wayne Lawrence Staats, and Jeffrey P. Koplow. Rotary Vapor Compression Cycle Final Report. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1426059.

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Bergander, Mark J., and Dariusz Butrymowicz. New Regenerative Cycle for Vapor Compression Refrigeration. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/1148712.

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Brown, J. S., P. A. Domanski, and E. W. Lemmon. CYCLE_D: NIST vapor compression cycle design program:. Gaithersburg, MD: National Institute of Standards and Technology, November 2018. http://dx.doi.org/10.6028/nist.nsrds.49-2018.

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Mark J. Bergander. New Regenerative Cycle for Vapor Compression Refrigeration. Office of Scientific and Technical Information (OSTI), August 2005. http://dx.doi.org/10.2172/850491.

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Kim, Byung Soon, and Piotr A. Domanski. Intracycle evaporative cooling in a vapor compression cycle. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5873.

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Domanski, Piotr A., J. S. Brown, and Eric W. Lemmon. CYCLE_D: NIST Vapor Compression Cycle Design Program Version 5.1. National Institute of Standards and Technology, July 2016. http://dx.doi.org/10.6028/nist.nsrds.49.

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Brown, JS, PA Domanski, and EW Lemmon. CYCLE_D: NIST vapor compression cycle design program, version 5.1.1, user's guide. Gaithersburg, MD: National Institute of Standards and Technology, March 2017. http://dx.doi.org/10.6028/nist.nsrds.49-2017.

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Hosni, Mohammad H. Development of a Water Based, Critical Flow, Non-Vapor Compression cooling Cycle. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1129868.

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Domanski, Piotr A., and David A. Didion. Impact of refrigerant property uncertainties on prediction of vapor compression cycle performance. Gaithersburg, MD: National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.ir.86-3373.

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