This paper presents the heat transfer performance of a Flexible Looped Heat Pipe (FLHP) using R134a as a working fluid. In our evaluation system, an evaporator and a condenser are connected by long flexible tubes with a diameter of 3 mm, and the total piping length of this looped heat pipe system is approximately 7500 mm. We selected porous Teflon with an effective pore diameter of 2rcw = 1.2 µm to overcome high gravitational heads. Elevation of the evaporator above the condenser (∆H = He -Hc) was changed in three conditions [1 Top heat mode (∆H = +1 m), 2 Horizontal mode (∆H = 0), 3 Bottom heat mode (∆H = -1 m)] considering the terrestrial application and the influence of gravity on the FLHP performance was investigated. FLHP provided high thermal transport capacities over long distances through small cross-sectional flexible tubes compared with conventional heat pipes. We also proposed an analysis method to predict the maximum heat transfer rate of FLHP.
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