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TECHNICAL PAPERS

Experimental Studies on a Heat Pump Operating With R22, R407C and R407A: Comparison From an Exergy Point of View

[+] Author and Article Information
B. Rakhesh, G. Venkatarathnam, S. Srinivasa Murthy

Refrigeration and Airconditioning Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036 (India)

J. Energy Resour. Technol 125(2), 101-112 (Jun 04, 2003) (12 pages) doi:10.1115/1.1538631 History: Received February 01, 2002; Revised October 01, 2002; Online June 04, 2003
Copyright © 2003 by ASME
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References

Gabrielii,  C., and Vamling,  L., 1997, “Replacement of R22 in tube and shell condensers: experiments and simulations,” Int. J. Refrig., 20, pp. 165–178.
Apera,  C., Mastrullo,  R., and de Rossi,  F., 1996, “Behavior and Performance of R502 Alternative Working Fluids in Refrigerating Plants,” Int. J. Refrig., 19, pp. 257–263.
Domanski,  P. A., Didion,  D. A., and Doyle,  J. P., 1994, “Evaluation of Suction-line/liquid-line Heat Exchange in the Refrigeration Cycle,” Int. J. Refrig., 17(7), pp. 487–493.
Mulroy,  W. J., Domanski,  P. A., and Didon,  D. A., 1994, “Glide Matching with Binary and Ternary Zeotropic Refrigerant Mixtures Part. I: An Experimental Study,” Int. J. Refrig., 17, pp. 220–229.
Jung,  D., Song,  Y., and Park,  B., 2000, “Performance des Melanges de Frigorigences Utilises Pour Remplacer le HCFC22,” Int. J. Refrig., 23, pp. 466–474.
Ferreira, C. A. I., Vanderree, H., and Touber, S., 1999, “The Role of Compressors in Industrial Refrigeration Plants (An Exergy Analysis),” Proceedings of the 20th International Congress of Refrigeration, IIR/IIF, Sydney, Australia, sept. 19–24, 1999, III(578), pp. 2843–2851.
Pannock, J., Didion, D. A., and Radermacher, R., 1991, “Energetic Behavior of Chlorine-free Zeotropic Refrigerant Mixtures in a Heat Pump or Air Conditioner: A Computer Study and Practical Test,” Proceeding of DKV Tagungsbericht, 18 (2), pp. 125–139.
Domanski,  P. A., and Didion,  D. A., 1993, “Thermodynamic Evaluation of R-22 Alternative Refrigerants and Refrigerants Mixtures,” ASHRAE Trans., 99, pp. 636–648.
Dheeraj, G., Venkatarathnam, G., Srinivasa Murthy, S., and Oellrich, L. R., 2000, “Untersuchungen an Einem Kombinierten Wärmepumpen-Kühler Teststand für Gleichzeitige Heiz-und Kühlanwendungen,” Experiments on Compression Heat Pump-Chillers for Simultaneous Heating and Cooling Applications, Annual conference of Deutscher Kälte-und Klimatechnischer Verein (DKV), Bremen, Germany, Nov. 2000 II(2), pp. 65–76.
Dheeraj, G., 2000, “Experiments on Heat Pump Chiller with Different Working Fluids,” M.S. Thesis, Indian Institute of Technology Madras, India.
Brodyansky, V. M., Sorin, M. V., Legoff, P., and Pilavachi, P. A., 1994, “The Efficiency of Industrial Processes: Exergy Analysis and Optimization,” Elsevier, Amsterdam.

Figures

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Different cases of heat exchange
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Schematic view of the test stand
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Variation of overall COP (heating + cooling) with condensing and evaporating temperature
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Variation of heating capacity with condensing and evaporating temperature
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Variation of cooling capacity with condensing and evaporating temperature
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Variation of compressor isentropic efficiency with condensing and evaporating temperature
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Variation of compressor volumetric efficiency with condensing and evaporating temperature
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Variation of internal exergy efficiency of the cycle (refrigerant side alone) with condensing and evaporating temperature
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Variation of external exergy efficiency of the cycle (refrigerant side as well as water side) with condensing and evaporating temperature
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Variation of the exergy efficiency of the compressor with condensing and evaporating temperature
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Variation of exergy efficiency of the condenser with different fluids
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Variation of exergy efficiency of the evaporator with different fluids
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Distribution of exergy losses (external cycle) for different fluids at an evaporating temperature of 0\degree C
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Improvement that can be obtained in the external exergy efficiency of the cycle (refrigerant side as well as water side) when the compressor exergy efficiency is same as that for R22
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Improvement that can be obtained in the internal exergy efficiency of the cycle (refrigerant side only) when the compressor exergy efficiency is same as that for R22

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