Heat pump air-conditioning system based on bypass defrosting conducted through air exhausting of compressor

The invention provides a heat pump air-conditioning system based on bypass defrosting conducted through air exhausting of a compressor. According to the system, defrosting is conducted on an air-cooling type evaporator through air exhausting of the compressor; the purposes of conducting defrosting on the evaporator and increasing the performance coefficient of the system are achieved; meanwhile, the defects in a reverse defrosting method adopted in the prior art are overcome; heating interruption and temperature fluctuation are avoided; and the comfort level is raised. 本发明提供种基于压缩机排气旁通融霜的热泵空调系统。该系统利用压缩机排气对风冷型蒸发器进行除霜，达到蒸发器融霜及提高系统性能系数的目的，同时又克服了现有技术中逆向融霜方法中的缺陷，避免了制热的间断和温度的波动，提高了舒适度。