Thermodynamic performance limit considerations for dual-evaporator, non-azeotropic refrigerant mixture-based domestic refrigerator-freezer systems

M. K. Smith, M. C. Heun, R. R. Crawford, T. A. Newell

Research output: Contribution to journalArticle

Abstract

Non-azeotropic refrigerant mixtures (NARMs) are investigated for a two-temperature level heat exchange process found in a domestic refrigerator-freezer. Ideal (constant air temperature) heat exchange processes are assumed. The results allow the effects of intercooling between the evaporator refrigerant stream and the condenser outlet stream to be examined in a systematic manner. For the conditions studied, an idealized NARM system will have a limiting coefficient of performance (COP) that is less than that of the best performing pure refrigerant component. However, for non-ideal heat exchange processes (gliding air temperature), the NARM-based system can have a higher limiting COP than a system running on either pure NARM component. Intercooling significantly affects the COP of NARM-based systems; however, depending on the location of 'pinch points' in the heat exchangers, only one intercooling heat exchanger may be needed to obtain a NARM's maximum refrigerator COP. The results are presented for mixtures of R22-R142b, R22-R123 and R32-R142b.

Original languageEnglish (US)
Pages (from-to)237-242
Number of pages6
JournalInternational Journal of Refrigeration
Volume13
Issue number4
DOIs
StatePublished - Jul 1990
Externally publishedYes

Keywords

  • domestic refrigerator-freezers
  • non-azeotropic refrigerant mixtures
  • thermodynamic performance

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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