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Options for low-global-warming-potential and natural refrigerants part I: Constrains of the shape of the P–T and T–S saturation phase boundaries.

Author(s) : ALLY M. R., SHARMA V., NAWAZ K.

Type of article: Article, IJR article

Summary

Current research focus is migrating toward low-global-warming-potential (GWP) and natural refrigerants to address the human impact on climate change. In this paper, we examine 13 refrigerants from the per- spective of the characteristic shape of their respective temperature–entropy (T–S) and the logarithm of the pressure versus inverse absolute temperature (log P vs. T –1 ) saturated phase boundary. Such analyses explain why certain refrigerants possess a re-entrant characteristic while others do not. The re-entrant region is due to skewness of the saturation boundary. The cause of skewness is investigated for its im- portance in heat pump performance, design, and configuration. Re -entrant behavior contributes to pre- mature mechanical wear of compressor components. Knowledge of the properties of the phase boundary on either side of the critical point, is useful for a better perspective on discriminating refrigerants, as hydrochlorofluorocarbons are phased out and replacement refrigerants must be found. We conclude by identifying a candidate low-GWP refrigerant for heat pumps. In Part II, we evaluate all 13 refrigerants in thermodynamic cycles based on exergy analysis to identify sources of irreversibility, the root cause of systemic inefficiency.

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Pages: 144-152

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Details

  • Original title: Options for low-global-warming-potential and natural refrigerants part I: Constrains of the shape of the P–T and T–S saturation phase boundaries.
  • Record ID : 30026821
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 106
  • Publication date: 2019/10
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2019.05.010

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