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 journalArticle

59 Citations (Scopus)

Abstract

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
Volume29
Issue number2
DOIs
Publication statusPublished - 2006 Mar 1

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Air source heat pumps
Control systems
Heating

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

Cite this

Byun, Ju Suk ; Jeon, Chang Duk ; Jung, Ji Hoon ; Lee, Jinho. / The application of photo-coupler for frost detecting in an air-source heat pump. In: International Journal of Refrigeration. 2006 ; Vol. 29, No. 2. pp. 191-198.
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The application of photo-coupler for frost detecting in an air-source heat pump. / Byun, Ju Suk; Jeon, Chang Duk; Jung, Ji Hoon; Lee, Jinho.

In: International Journal of Refrigeration, Vol. 29, No. 2, 01.03.2006, p. 191-198.

Research output: Contribution to journalArticle

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