Exergy analysis and experimental study of a vapor compression refrigeration cycle

Abstract From the last few years, the use of efficient ejector in refrigeration systems has been paid a lot of attention. In this article a description of a refrigeration system that combines a basic vapor compression refrigeration cycle with an ejector cooling cycle is presented. A one-dimensional mathematical model is developed using the flow governing thermodynamic equations based on a constant area ejector flow model. The model includes effects of friction at the constant-area mixing chamber. The current model is based on the NIST-REFPROP database for refrigerant property calculations. The model has basically been used to determine the effect of the ejector geometry and operating conditions on the performance of the whole refrigeration system. The results show that the proposed model predicts ejector performance, entrainment ratio and the coefficient of performance of the system and their sensitivity to evaporating and generating temperature of the cascade refrigeration cycle. The simulated performance has been then compared with the available experimental data from the literature for validation.

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Molecular-level computer simulation of a vapor-compression refrigeration cycle

Fluid Phase Equilibria ◽

10.1016/j.fluid.2007.06.020 ◽

2007 ◽

Vol 259 (2) ◽

pp. 195-200 ◽

Cited By ~ 5

Author(s):

S. Figueroa-Gerstenmaier ◽

M. Francova ◽

M. Kowalski ◽

M. Lisal ◽

I. Nezbeda ◽

...

Keyword(s):

Computer Simulation ◽

Molecular Level ◽

Refrigeration Cycle ◽

Vapor Compression ◽

Vapor Compression Refrigeration Cycle ◽

Vapor Compression Refrigeration

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Energy and Exergy Analysis of Combined Organic Rankine Cycle-Single and Dual Evaporator Vapor Compression Refrigeration Cycle

Applied Sciences ◽

10.3390/app9235028 ◽

2019 ◽

Vol 9 (23) ◽

pp. 5028 ◽

Cited By ~ 1

Author(s):

Pektezel ◽

Acar

Keyword(s):

Exergy Analysis ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Working Fluid ◽

Refrigeration Cycle ◽

Vapor Compression ◽

Exergy Destruction ◽

Energy And Exergy ◽

Energy And Exergy Analysis ◽

Vapor Compression Refrigeration

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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THEORETICAL AND EXPERIMENTAL ANALYSIS OF A VAPOR-COMPRESSION REFRIGERATION CYCLE WITH A HEAT EXCHANGER BETWEEN THE SUCTION AND LIQUID LINES

Revista de Engenharia Térmica ◽

10.5380/reterm.v18i2.70783 ◽

2019 ◽

Vol 18 (2) ◽

pp. 19

Author(s):

L. S. Santana ◽

J. Castro ◽

L. M. Pereira

Keyword(s):

Heat Exchanger ◽

Experimental Analysis ◽

Thermodynamic Cycle ◽

Electrical Energy ◽

Coefficient Of Performance ◽

Refrigeration Cycle ◽

Vapor Compression ◽

Vapor Compression Refrigeration Cycle ◽

Vapor Compression Refrigeration ◽

Liquid Heat

Vapor-compression refrigeration systems require a significant amount of electrical energy. Therefore, there is a need for finding efficient ways of operating this equipment, reducing their energy consumption. The use of heat exchangers between the suction line and the liquid line can produce a better performance of the thermodynamic cycle, as well as reduce it. The present work aims at an experimental analysis of the suction/liquid heat exchanger present in a freezer running with refrigerant fluid R-134a. Three different scenarios were used in order to evaluate the thermal performance of the refrigeration cycle. The first scenario was the conventional freezer set up to collect the required data for further comparison. Moreover, the second and third scenarios were introduced with a 20 cm and 40 cm suction/liquid heat exchanger, respectively, into the system. From the experiments, it was observed that the heat exchange does not significantly affect the coefficient of performance (COP) of the freezer. It was concluded from this work that the best scenario analyzed was the 20 cm suction/liquid heat exchanger where most of the thermodynamic properties were improved, one of them being the isentropic efficiency.

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