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

间接排气管冷却方式，当流经热交换器，流经任意方向通过与废气热交换器或散热箱。

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.

回顾了空调机热交换器层铝散热片的研究概况，介绍了6种类型层散热片材料的基本情况以及亲膜散热片的应用效果。提出了该课题今后的研究方向。