Abstract
The thermal performance of a wickless heat pipe receiver for parabolic trough solar collector applications is investigated in this study. For three filling ratios of 30%, 50%, and 90%, nine different heat flux profiles were examined. The normal heat flux range was chosen to be between 58 and 288 W/m2. The influence of the non-homogeneity of the thermal flux on the receiver tube was numerically analysed for various filling ratios. The maximum average wall temperature of 390 K was observed for heat transfer profile 7 and a fill ratio of 30%. For a filling ratio of 90%, the heat flux profile 7 had a minimum thermal resistance of 0.245 K/W, and a correlation was proposed to calculate the thermal resistance. A maximum thermal resistance of 1.722 K/W was calculated for the heat flux profile 3 and a filling ratio of 30%.
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