scope:

NEN-EN-ISO 22975-2 specifies definitions and test methods for durability and performance of heat-pipes for solar thermal application. This part of ISO 22975 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. This part of ISO 22975 provides test methods for determining durability of the heat-pipe, including high temperature resistance and freeze resistance. This part of ISO 22975 also provides test methods for measuring performance of the heat-pipe, including starting temperature, temperature uniformity and heat transfer power of the heat-pipe. This part of ISO 22975 is only applicable to gravity heat-pipes.