Performance optimization of a two-circuit cycle with parallel evaporators for a domestic refrigerator-freezer

Won Jae Yoon, Hae Won Jung, Hyun Joon Chung, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


A two-circuit cycle with parallel evaporators (called a "parallel cycle") for a domestic refrigerator-freezer (RF) shows energy saving potential compared with a conventional cycle with a single loop or serial evaporators because of a low compression ratio in the fresh food compartment (R)-operation. The objective of this study is to investigate the effects of the refrigerant charge, R-capillary tube, and refrigerant recovery operation on the performance of a parallel cycle. In addition, design guidelines for the heat transfer area and air flow rate of an R-evaporator are proposed. When the parallel cycle was optimized in terms of the refrigerant charge and R-capillary tube diameter, the energy consumption was reduced by 7.8% over a bypass two-circuit cycle with the same RF platform. In addition, an additional energy saving of 1.8% was obtained by the optimization of the operating sequence and refrigerant recovery operation.

Original languageEnglish
Pages (from-to)216-224
Number of pages9
JournalInternational Journal of Refrigeration
Issue number1
Publication statusPublished - 2011 Jan


  • Cycle
  • Household refrigerator
  • Optimization
  • Parallel flow
  • Performance

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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