Air source heat pump system, and evaporator and control method thereof

The invention discloses an air source heat pump system, and an evaporator and a control method thereof. The evaporator comprises a working medium pipeline, a hot water pipeline and fins. The fins are connected between the working medium pipeline and the hot water pipeline. Water is selectively supplied into the hot water pipeline to remove frost on the fins. By arranging the hot water pipeline, the evaporator can replenish heat to an air heat source under the low temperature working condition, the high operation efficiency of the air source heat pump system can be guaranteed, the frost can be effectively removed, and accordingly the air source heat pump system can work normally in a severe cold area. In addition, the working medium pipeline and the hot water pipeline use the fins in common so that the heat exchange efficiency of the working medium pipeline and the hot water pipeline can be improved. 本发明公开了种空气源热泵系统及其蒸发器和控制方法，蒸发器包括：工质管道；热水管道；翅片，所述翅片连接在所述工质管道和所述热水管道之间，所述热水管道选择性地供入热水以去除所述翅片上的结霜。通过设置热水管道，蒸发器在低温工况下