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LOOP HEAT PIPES Loop Heat Pipes (LHPs) are robust, self-starting, and passive two-phase thermal transport devices. They utilize the latent heat of vaporization of a working fluid to transfer heat, and the surface tension forces formed in a fine-pore wick to circulate the working fluid. They are used to transport excess heat from a heat source such as payload instruments in a spacecraft to a low temperature heat sink, while maintaining the temperature within specified limits. Recent articles on LHPs published by GSFC include:
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