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루프 히트 파이프의 작동유체 선정을 위한 성능계수 도출
정욱철(Wukchul Joung),이진호(Jinho Lee),류태우(Taeu Yu) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Despite outstanding performance of loop heat pipes (LHPs) over other two-phase heat transfer devices, widespread applications of these devices are limited due to ambiguities on their operation. Among these, of particular interest is a figure of merit for working fluid selection. As for the selection of working fluids of LHPs, the figure of merit for heat pipes has usually been used, and qualitative approaches, such as choosing a working fluid of steep saturation curve slope, etc, has additionally been employed. However, as the figure of merit for heat pipes only concerns a maximum heat transfer capacity, it is not appropriate for assessing thermal performance of a working fluid with respect to steady state thermal performance of the LHPs. In this work, a figure of merit for LHPs, which quantitatively evaluates thermal performance of a working fluid regarding the steady state operation of the LHPs, is theoretically derived and experimentally verified.