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loop heat pipe
A loop heat pipe (LHP) is a two-phase heat transfer device that uses capillary action to remove heat from a source and passively move it to a condenser or radiator. LHPs are similar to heat pipes but have the advantage of being able to provide reliable operation over long distance and the ability to operate against gravity. They can transport a large heat load over a long distance with a small temperature difference. Different designs of LHPs ranging from powerful, large size LHPs to miniature LHPs (micro loop heat pipe) have been developed and successfully employed in a wide sphere of applications both ground based as well as space applications.
==Construction==
The most common coolants used in LHPs are anhydrous ammonia and propylene.〔(Loop Heat Pipe – LHP )〕 LHPs are made by controlling the volumes of the reservoir carefully, condenser and vapor and liquid lines so that liquid is always available to the wick. The reservoir volume and fluid charge are set so that there is always fluid in the reservoir even if the condenser and vapor and liquid lines are completely filled.
Generally small pore size and large capillary pumping capability are necessary in a wick. There must be a balance in the wick pumping capability and the wick permeability when designing a heat pipe or loop heat pipe.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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