针对纯电动汽车热泵型空调换热器冬季结霜问题,提出低压热气除霜和高压热气除霜两种除霜循环模式,并在焓差室模拟实际工况,进行了结霜除霜实验研究.以除霜时间、排气压力和压缩机能耗为指标,对各种除霜模式(包括传统逆循环除霜模式)进行了对比分析.结果表明:在3种除霜模式中,低压热气除霜模式所需除霜时间最长,排气压力最高,除霜过程中压缩机能耗最大;逆循环除霜模式次之,且车内环境舒适度较差;而高压热气模式除霜时间最短(仅2min),排气压力最低(最高仅为0.65MPa),能耗最小(仅为86.83kJ),且不会对车内环境舒适性造成影响,故是一种较为理想的除霜模式.%In order to solve the problem of frosting on the heat exchanger in the heat pump type air condi-tioner of battery electric vehicles,two defrosting cycles i.e. low pressure hot gas(LPHG) defrosting and high pres-sure hot gas (HPHG) defrosting are proposed with an experimental study on frosting and defrosting conducted by simulating the real working conditions in enthalpy difference chamber. The defrosting modes, including traditional reverse cycle defrosting mode,are compared and analyzed with defrosting time,exhaust pressure and compressor en-ergy consumption as evaluating indicators. The results show that among three defrosting cycles,the LPHG cycle has longest defrosting time,highest exhaust pressure and highest compressor energy consumption,the reverse cycle de-frosting is next to it with a poor in-car amenity, while the HPHG defrosting cycle has the shortest defrosting time (only 2 minutes), the lowest exhaust pressure (0.65MPa at most) and the lowest energy consumption (only 86.83kJ) with the least adverse effects on in-car amenity,so is an ideal mode of defrosting.
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