Abstract
We experimentally studied thermal conductance of an inclined loop heat pipe for a solar collector. Length of the evaporator is 1 m, inclination angle is 30°, and working fluid is water. Effects of heat input, saturation temperature of the working fluid, and liquid fill ratio on the thermal conductance, the average evaporation heat transfer coefficient and the average condensation heat transfer coefficient are examined. We found that the thermal conductance of the inclined loop type heat pipe is 40〜50 W/K. There is an optimum liquid fill ratio. When the liquid fill ratio is too small, dry-out portion appears in the evaporator. When the liquid fill ratio is too large, the liquid enters in the condenser to decrease heat transfer area.
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