Exergy analysis and experimental study of a vapor compression refrigeration cycle
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This article presents a detailed experimental analysis of 2TR (ton of refrigeration) vapor compression refrigeration cycle for different percentage of refrigerant charge using exergy analysis. An experimental setup has been developed and evaluated on different operating conditions using a test rig having R22 as working fluid. The coefficient of performance, exergy destruction, and exergetic efficiency for variable quantity of refrigerant has been calculated. The present investigation has been done by using 2TR window air conditioner and the results indicate that the losses in the compressor are more pronounced, while the losses in the condenser are less pronounced as compared to other components, i.e., evaporator and expansion device. The total exergy destruction is highest when the system is 100% charged, whereas it is found to be least when the system is 25% charged.
KeywordsVapor compression system Exergy analysis COP Exergy efficiency Irreversibility Exergy destruction
List of symbols
Ton of refrigeration
British thermal units
Coefficient of performance
Refrigerating effect (W)
Compressor work (W)
Exergy destruction in evaporator (W)
Exergy destruction in compressor (W)
Exergy destruction in condenser (W)
Exergy destruction in expansion device (W)
Total exergy destruction (W)
Mass flow rate (kg/s)
Entropy (kJ kg−1 K−1)
Enthalpy (kJ kg−1)
Reference temperature (°C)
Evaporator temperature (°C)
Carnot coefficient of performance
Discharge pressure (kg/cm²)
Suction pressure (kg/cm²)
- Cond. In
Condenser inlet temperature (°C)
- Evap. Inlet
Evaporator inlet temperature (°C)
The necessary facilities provided by SMVD University, Katra (J&K) are highly appreciated. One of the authors (SA) also expresses thanks to Mr. Raman Kumar, workshop operator and Mr. Pardeep Kumar, technician for their help in modifying the existing air conditioning unit.
- 3.Kaushik SC. Solar refrigeration and air conditioning. Jodhpur: Divya-Jyoti Parkashan, Gio-environ Academia Press; 1989.Google Scholar
- 4.Kotas TJ. The exergy method of thermal plant analysis. London: Butterworth; 1985.Google Scholar
- 11.Bejan A, Tsatsaronis G, Moran M. Thermal design and optimization. New York: Wiley; 1996.Google Scholar
- 17.Dincer I. Refrigeration systems and applications. London: Wiley; 2003. pp. 26–27.Google Scholar
- 18.Forane ver 4.0. Refrigeration simulator. ATOFINA. Available at www.fridgetech.com.
- 21.Tyagi SK, Kim MS, Park SR, Anand S. Second law based performance of a modified VAC hybrid heat pump system using NH3–H2O as the working fluid. Indian J Pure Appl Phys. 2010;48:212–9.Google Scholar
- 23.Kaushik SC, Singhal MK, Tyagi SK. Solar collector technologies for power generation and space air conditioning applications: a state of the art. Internal Report, Centre for Energy Studies, Indian Institute of Technology, Delhi, India; 2001.Google Scholar
- 24.Tyagi VV, Pandey AK, Kaushik SC, Tyagi SK. Thermal performance evaluation of a solar air heater with and without thermal energy storage—an experimental study. J Therm Anal Calorim. doi: 10.1007/s10973-011-1617-3.
- 25.Pandey AK, Tyagi VV, Park SR, Tyagi SK. Comparative experimental study of solar cookers using exergy Analysis. J Therm Anal Calorim. doi: 10.1007/s10973-011-1501-1.