The application of photo-coupler for frost detecting in an air-source heat pump

Ju Suk Byun, Chang Duk Jeon, Ji Hoon Jung, Jinho Lee

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)


This experimental study is carried out to investigate reliability and effectiveness of a new method of using photo-coupler for detecting frost formation in an air source heat pump, and further to determine the most efficient initiation point of the defrost cycle. This new method of using photo-coupler as a frost sensing device is evaluated by comparing its performance with conventional time control defrost system in which defrost cycle is set to start at predetermined interval, e.g. about at every 1-1.5 h. Results indicate that overall heating capacity of photo-coupler detection method (case IV) is 5.5% higher than that of time control method. It is also shown that for maximum efficiency the defrost cycle must be initiated before the frost build-up area exceeds 45% of total front surface of the outdoor coil.

Original languageEnglish
Pages (from-to)191-198
Number of pages8
JournalInternational Journal of Refrigeration
Issue number2
Publication statusPublished - 2006 Mar

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering


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