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

Author(s) : BYUN J. S., JEON C. D., JUNG J. H., et al.

Type of article: Article, IJR article

Summary

This experimental study is carried out to investigate reliability and effectiveness of a new method of using a 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 every 1-1.5 h. Results indicate that overall heating capacity of the photo-coupler detection method (case IV) is 5.5% higher than that of the 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.

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Format PDF

Pages: 191-198

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Details

  • Original title: The application of photo-coupler for frost detecting in an air-source heat pump.
  • Record ID : 2006-1482
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 29 - n. 2
  • Publication date: 2006/03

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