Browse > Article
http://dx.doi.org/10.6110/KJACR.2014.26.9.434

Feasibility of the Defrost Control by Photoelectric Technology via Comparison with the Temperature Differential Defrosting Method  

Jeon, Chang-Duk (Department of Mechanical Engineering, Korea National University of Transportation)
Kim, Dong-Seon (Department of Mechanical Engineering, Korea National University of Transportation)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.26, no.9, 2014 , pp. 434-440 More about this Journal
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.
Keywords
Frost; Temperature Differential Defrosting Method; Photoelectric Sensor; Mal-defrost Phenomena;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Xiao, J., Wang, W., Guo, Q. C., and Zhao, Y. H., 2010, An experimental study of the correlation for predicting the frost height in applying the photoelectric technology, International Journal of Refrigeration, Vol. 33, No. 5, pp. 1006-1014.   DOI   ScienceOn
2 Byun, J. S., Jeon, C. D., Jung, J. H., and Lee, J. H., 2006, The application of photo-coupler for frost detecting in an air-source heat pump, International Journal of Refrigeration, Vol. 29, No. 2, pp. 191-198.   DOI   ScienceOn
3 Xiao, J., Wang, W., Zhao, Y. H., and Zhang, F. R., 2009, An analysis of the feasibility and characteristics of photoelectric technique applied in defrost-control, International Journal of Refrigeration, Vol. 32, No. 6, pp. 1350-1357.   DOI   ScienceOn
4 Jeon, C. D. and Jung, K. S., 2011, Frost sticking sensing device and method, Patent No. 10-1085691, Korea.
5 KS C 9306, 2002, Air conditioner.
6 KS B 6275, 2002, Reciprocating water-chillers.
7 Wang, W., Feng, Y. C., Zhu, J. H., Li, L. T., Guo, Q. C., and Lu, W. P., 2013, Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions, Applied Energy, Vol. 112, pp. 1138-1145.   DOI   ScienceOn
8 Wang, W., Xiao, J., Guo, Q. C., Lu, W. P., and Feng, Y. C., 2011, Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena, Applied Energy, Vol. 88, No. 12, pp. 4470-4480.   DOI   ScienceOn