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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 bythe 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 temperaturedifferential defrosting method are in good agreement with those predicted by the high and low threshold output voltages of the photoelectric sensor. Key words Frost(), Temperature Differential Defrosting Method(  ), Photoelectric Sensor(), Mal-defrost Phenomena( )†Corresponding author, E-mail: dongseonkim@ut.ac.kr  :  [W] T :  [K]  :  [W] cool :  DB :  heat :

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