ISO 22975-2:2016规定了太阳能热应用热管耐久性和性能的定义和试验方法。 ISO 22975-2:2016适用于与真空管一起使用的热管，包括玻璃金属密封真空管和双玻璃真空管，以及平板收集器。 ISO 22975-2:2016提供了确定热管耐久性的试验方法，包括耐高温性和抗冻性。 ISO 22975-2:2016还提供了测量热管性能的试验方法，包括热管的启动温度、温度均匀性和传热功率- 管 ISO 22975-2:2016仅适用于重力热管。

ISO 22975-2:2016 specifies definitions and test methods for durability and performance of heat-pipes for solar thermal application. ISO 22975-2:2016 is applicable to heat-pipes for use with evacuated tubes, including glass-metal sealed evacuated tubes and double-glass evacuated tubes, as well as with flat plate collectors. ISO 22975-2:2016 provides test methods for determining durability of the heat-pipe, including high temperature resistance and freeze resistance. ISO 22975-2:2016 also provides test methods for measuring performance of the heat-pipe, including starting temperature, temperature uniformity and heat transfer power of the heat-pipe. ISO 22975-2:2016 is only applicable to gravity heat-pipes.