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Evolving an optimal composition of HFC-407C/HC-290/HC-600a mixture as an alternative to HCFC-22 in window air conditioners.

Author(s) : JABARAJ D. B., NARENDRAN A., MOHAN LAL D., et al.

Type of article: Article

Summary

Countries that have ratified the Montreal Protocol have to phase out HCFC-22 in the near future due to its ozone depleting potential and hence new eco-friendly refrigerants are being evolved as substitutes. At present, HFC-407C is one of the promising drop-in substitutes for HCFC-22. But it is immiscible with mineral oil and hence polyolester oil is recommended. Since POE oil is highly hygroscopic in nature, it is not user friendly. However such oil immiscibility issue of HFC-134a has been overcome by the addition of HC blend to it, which also resulted in performance improvements. An attempt has been made to study the possibility of using this mixture as a substitute for HCFC-22 in a window air conditioner and to evolve an optimal composition for the mixture. Experiments were carried out in a room calorimeter setup fitted with 1050 W capacity window air conditioner. The new refrigerant mixtures demand longer condenser length to decrease the high discharge pressure matching with HCFC-22 systems and hence the length has been increased while testing the mixtures. This also resulted in better heat transfer in condenser. The performance analysis revealed that the new refrigerant mixture performed better than that of HCFC-22. It has in fact been found that the new mixture can improve the actual COP by 8 to 11% and hence it can reduce the energy consumption by 5 to 10.5%. The overall performance has proved that the new refrigerant mixture could be an excellent substitute for HCFC-22. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Evolving an optimal composition of HFC-407C/HC-290/HC-600a mixture as an alternative to HCFC-22 in window air conditioners.
  • Record ID : 2007-0532
  • Languages: English
  • Source: International Journal of thermal Sciences - vol. 46 - n. 3
  • Publication date: 2007/03

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