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Flammability and performance test of R-290/R-134a mixtures for HCFC-22 replacement.

Author(s) : PASEK A. D., SUWONO A., UFIE R., et al.

Summary

The objective of this research is to investigate the possibility of using R-290/R-134a mixture as an alternative refrigerant for R-22 replacement. R-134a is used to reduce the flammability of R-290 and to make the saturation pressure close to R-22. The results show that at composition of 0.6 R-290/0.4 R-134a mole fraction, the mixture behave as an azeotrope refrigerant mixture and can be used for R-22 replacement. At this composition, lower flammability limit is 3,693%, which is higher than pure R-290. Hence, the refrigerant mixture can be classified as less flammable A2 class refrigerant. The performance test done in 0.75 hp vapour compression refrigeration machine shows that the refrigerant mixture can be used as a drop-in refrigerant in the R-22 machine. The measurement of refrigeration capacity and compressor input work at the same chilled water temperature shows that the calculated COP of the refrigerant mixture is better than R-22's but lower than R-290's. It is also shown that the better performance of the mixture is due to the less refrigerant charge and better overall heat transfer coefficient in the evaporator.

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Pages: 2006-2

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Details

  • Original title: Flammability and performance test of R-290/R-134a mixtures for HCFC-22 replacement.
  • Record ID : 2008-0065
  • Languages: English
  • Source: 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
  • Publication date: 2006/05/29

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