Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Feasibility of the Defrost Control by Photoelectric Technology via Comparison with the Temperature Differential Defrosting Method

온도차 감지 제상법과의 비교를 통한 광센서 제상법의 타당성 검증을 위한 연구

  • Jeon, Chang-Duk (Department of Mechanical Engineering, Korea National University of Transportation) ;
  • Kim, Dong-Seon (Department of Mechanical Engineering, Korea National University of Transportation)
  • 전창덕 (한국교통대학교 기계공학과) ;
  • 김동선 (한국교통대학교 기계공학과)
  • Received : 2014.04.24
  • Accepted : 2014.07.09
  • Published : 2014.09.10
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Abstract

Experiments were performed to verify if performance and characteristic curves obtained from the temperature differential defrosting method, where surface temperature is measured to judge defrosting condition, can be reproduced by the photoelectric technology where defrosting condition is judged by photoelectric sensors. The output voltage of a phototransistor and heating capacity, power consumption, and surface temperature of the outdoor heat exchanger are compared. The results showed that the photoelectric sensors can be used as a defrost control device. On-off control timings in temperature differential defrosting method are in good agreement with those predicted by the high and low threshold output voltages of the photoelectric sensor.

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References

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  1. Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2014 vol.27, pp.7, 2015, https://doi.org/10.6110/KJACR.2015.27.7.380