热百叶窗是热控制表面，其辐射特性可以改变，以保持部件的正确工作温度，使其吸收或产生的热量发生周期性变化。第12部分介绍了空间系统百叶窗的设计和施工，并专门提供了一条关于现有系统的详细信息。购买本文件时可获得的所有当前修订均包含在购买本文件中。

Thermal louvers are thermal control surfaces whose radiation characteristics can be varied in order to maintain the correct operating temperature of a component subject to cyclical changes in the amount of heat that it absorbs or generates.The design and construction of louvers for space systems are described in this Part 12 and a clause is also dedicated to providing details on existing systems.All current amendments available at time of purchase are included with the purchase of this document.