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，当水流经器时，允许水流经任意方向通过水与废气器或箱。

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.

回顾了空调机器预涂层铝的研究概况，介绍了6种类型预涂层材料的基本情况以及亲水性预涂膜的应用效果。提出了该课题今后的研究方向。