Indirect cooling circuit via heat exchanger allowing optional heat recovery for the calorifier or cabin heating.

间接排气管水冷却方式，当水流经时，允许水流经任意方向通过水与废气或箱。

Studies on heat exchanger aluminum fin precoat of air conditioner were reviewed. Six types of precoat as well as the application of hydrophilic precoat were described.

回顾了空调机预层片的研究概况，介绍了6种类型预层片材料的基本情况以及亲水性预膜片的应用效果。提出了该课题今后的研究方向。