International Scientific Journal

Thermal Science - Online First

online first only

Performance assessment of alternate refrigerants for retrofitting R22 based air conditioning system

The performance of zero Ozone Depletion Potential (ODP) refrigerants is investigated when retrofitted in R22 based air conditioning system. The options evaluated are R407C, R417A, R422D, R427A and R438A. In order to arrive at most suitable alternative/s to R22, energy and exergy performance of candidate refrigerants is carried out and compared against that of R22. The COPs and exergy efficiencies showed that none of selected refrigerant is as efficient as R22 however their values suggests that each may be considered as potential substitute for retrofitting. Having comparable COP to others but low cooling capacity of R417A makes it less attractive. With comparatively reduced COP, lowest exergy efficiency and highest mass flow rate, makes R422D the least desirable option. R407C, R427A and R438A emerged as most attractive substitutes. The lower discharge temperatures of substitutes will enhance the compressor life. Further, for substitutes there may be a possible change out of expansion valve.
PAPER REVISED: 2016-11-28
PAPER ACCEPTED: 2016-12-03
  1. ***, United Nations Environmental Program,
  2. Devotta, S., et. al., Alternatives to HCFC22 for air conditioners, Appl. Therm. Eng., 21, (2001), pp.703-715.
  3. Spatz, M.W., Motta, S.F., An evaluation of options for replacing HCFC22 in medium temperature refrigeration systems, Refrig., 27, (2004), pp. 475-483.
  4. Chen, W., Comparative study on the performance and environmental characteristics of R410A and R22 residential air conditioners, Appl. Therm. Eng., 28, (2008), pp. 1-7.
  5. Aprea, C., Renno, C., Experimental comparison of R22 with R417A performance in a vapor compression refrigeration plant subject to a cold store, Energy convers. Manage., 45 (2004), pp. 1807-1819.
  6. Aprea, C., et. al., An evaluation of R22 substitutes performances regulating continuously the compressor refrigerating capacity, Appl. Therm. Eng., 24 (2004), pp. 127-139.
  7. Arora, A., Sachdev, H.L., Thermodynamic analysis of R422 series refrigerants as alternative refrigerants to HCFC 22 in a vapor compression refrigeration system, J Energy Res., 22 (2009), pp. 753-765.
  8. Park, K.J., et. al., A drop in' refrigerant R431A for replacing HCFC22 in residential air conditioners and heat pumps, Energy covers. Manage., 50 (2009), pp. 1671-1675.
  9. Park, K.J., et. al., Experimental performance of R432A to replace R22 in residential air conditioners and heat pumps, Appl. Therm. Eng., 29 (2009), pp. 597-600.
  10. Torrella, E., et. al., On site study of HCFC22 substitution for HFC non azeotropic blends (R417A, R422D) on a water chiller of a centralized HVAC systems, Energy Build., 42, (2010), pp. 1561-1566.
  11. Rocca, V., Panno, G., Experimental performance evaluation of a compression refrigeration plant when replacing R22 with alternative refrigerants, Appl. Energy., 88 (2011), pp. 2809-2815.
  12. Messino, A., et. al., On site experimental study of HCFC-22 substitution with HFCs refrigerants, Energy Procedia, 14, (2012), pp. 32-38.
  13. Allgood, C.C., Lawson, C.C., Performance of R438A in R22 refrigeration and air conditioning systems, Proceedings, 13th International Refrigeration and Air Conditioning Conference., West Lafayette, USA, 2010.
  14. Stanciu., et. al., Exergy analysis and refrigerant effect on the operation and performance limits of one stage vapor compression refrigeration system, Thermotehnica., 1, (2011), pp. 36-42.
  15. Llopis, R., et. al., Experimental evaluation of HCFC-22 replacement by the drop in fluids HFC-422A and HFC-417B for low temperature refrigeration applications, Appl. Therm. Eng., 31, (2011), pp. 1323-1331.
  16. Aprea, C., et. al., Exergy analysis of a cooling system: An experimental investigation on the consequences of the retrofit of R22 with R422D, Int. J. Low Carbon Technologies., 0 (2012), pp. 1-9.
  17. Chakravarthy, M.A., Kumar, S.D., Experimental investigation of an alternate refrigerant for R22 in window air conditioning system, Int. J. Scientific and Research Publications., 2(10), (2012).
  18. Bolaji, B.O., Performance of R22 split air conditioner when retrofitted with ozone friendly refrigerants, J. Energy SA., 23(3) 2012.
  19. Vedat Oruc., Devecioglu, A.G., Thermodynamic performance of air conditioners working with R417A and R424A as alternatives to R22, Int. J. Refrigeration., 55 (2015), pp. 120-128.
  20. Ramu, N.S., et. al., Energy performance assessment of R32/R125/R600a mixtures as possible alternatives to R22 in compression refrigeration systems, Int. J. Mechanical and Mechatronics Eng., 14(2), (2014).
  21. Vandaarkuzhali, S., Elansezhian, R., Experimental investigation of R152a/R22 mixture in an air conditioning system," Int. J. Science and Research. 3(12), (2014).
  22. Venkataiah, S., Venkata, G., Analysis of alternate refrigerants to R22 for air conditioning applications at various evaporating temperatures, Int. J. Engineering Research and applications, 4, (2014), pp. 39-46.
  23. Boumaza, M., Thermodynamic performance assessment of Ozone friendly natural refrigerants as potential substitutes to HCFCs, Int. J. Chemical Engineering and Applications, 6(1), (2015), pp. 18-22.
  24. Bukac, H., Properties of refrigerants affect compressor design, Proceedings, International Compressor Engineering Conference, West Lafayette, USA, 2012, Paper 2244.
  25. ***, U.S Environmental Protection Agency,
  26. Domanski, P.A., McLinden, M.O., A simplified cycle simulation model for the performance rating of refrigerants and refrigerant mixtures, Int. J. Refrigeration., 15(2), (1992), pp. 81-87.
  27. Cengel, Y., Boles, A., Thermodynamics, McGraw Hill Inc., New York, USA, 2011.
  28. Stoeker, W.F., Jones, J.W., Refrigeration and Air Conditioning, McGraw Hill Inc.
  29. Lemmon, Huber, McLinden, REFPROP, NIST standard Reference Database 23, V9.1, (2013).
  30. Minor, B., Yokozeki, A., Compressor performance analysis of refrigerants (R22 and R407C) with various lubricants in a heat pump, Proceedings, International Refrigeration and Air Conditioning Conference., West Lafayette, USA, 2004.
  31. ***, Bitzer, Technical Information, Retrofitting of R22 medium and low temperature systems to alternative refrigerants, (2011).