Performance of a Heat Pump Type Air Conditioner Using R410A under Frosting Conditions
An experimental study was carried out to investigate the performance of a heat pump type air conditioner using R410a and fin-tube heat exchanger under frosting conditions.The system performances were determined with an air-enthalpy test system under the test condition of the air temperature being -5℃, the relative humidity being 60％-95％ and the evaporating temperature being -7℃-7℃,while the average frost thickness was determined by photomicrography. It is shown that the frosting rate and frost thickness are of different influences on the refrigerating capacity,evaporating temperature,refrigerant pressure drop and heat transfer efficiency of the refrigerating system.The decaying-degree of running performance changes obviously from early frosting stage to final frosting stage.The frosting rate reaches the largest at 0℃-40℃ with the relative moisture over 80％.
Liu Y Wang F Wang T Liu P Xue M Wu Z M
College of Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,P.R.China
国际会议
上海
英文
551-554
2008-04-05（万方平台首次上网日期，不代表论文的发表时间）