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Theoretical and experimental study on several refrigerants of moderately high temperature heat pump.

Author(s) : PAN L., WANG H., CHEN Q., et al.

Type of article: Article

Summary

The aim of the study is to select working fluids which have excellent performance and are environment friendly for moderately high temperature heat pump. Theoretical study is executed on several HCFCs and HFCs, with ODP of zero or small value firstly. And then research is carried out on a water-to-water vapor compression heat pump system applying the experimental assessment method of specifying working fluid parameters. Based on theoretical analysis, HFC-245fa, HC-600, HC-600a, and a zeotropic refrigerant mixture HC-600/HFC-245fa (mass fraction: 2.83/97.17%) are used as refrigerant for the experiment, with the evaporating temperature range of 30–55°C, and condensing temperature range of 60–100°C. Theoretical analysis shows that HCFC-141b, HCFC-123, HFC-245ca, HC-600 and HFC-245fa have large COPh. However, pressure ratio of HFC245ca, HCFC-141b and HCFC-123 is too large. The experimental results indicate that both the natural working fluids have excellent cycle performances in moderately high temperature heat pump cycle. Their heating coefficients of performance (COPh) have little difference in the conditions of lower temperature cycle, but the cycle performance of HC600 is better than HC600a in higher temperature conditions. When the evaporating temperature and the condensing temperature are 44 and 90°C, COPh of HC-600 and HC-600a are 3.84 and 3.33 respectively. In higher temperature conditions, the performance of the zeotropic refrigerant mixture HC-600/HFC-245fa is much better than HFC-245fa. When the evaporating temperature is 50°C, and the cycle temperature lift is 45°C, COPhs of HC-600/HFC-245fa are 3.74 and 3.83 respectively. [Reprinted with permission from Elsevier. Copyright, 2011].

Details

  • Original title: Theoretical and experimental study on several refrigerants of moderately high temperature heat pump.
  • Record ID : 30004134
  • Languages: English
  • Subject: HFCs alternatives
  • Source: Applied Thermal Engineering - vol. 31 - n. 11-12
  • Publication date: 2011/08
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2011.02.035

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