| 摘要 |
In order to prevent collapse and stress cracking of heat transfer devices, such as those devices utilized in solar energy systems, a container, particularly one made of plastic, is partially filled with a solid or liquid heat transfer medium which evaporates and condenses over the working temperature range of the device, in an amount sufficient to leave a void space in the device at the highest temperature to which the device is subjected, an inert, solidifiable or liquifiable pressurizing material, such as solid carbon dioxide, which undergoes phase transition to a gaseous state at a temperature at least as high as the lowest temperature to which the device is subjected, in an amount sufficient to create a positive pressure within the void space at the lowest temperature to which the device is subjected, is added and the container is sealed to produce a gas and vapor impervious device. A heat transfer device manufactured in this manner is also disclosed.
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