The present study aimed to improve a model to predict thermal performance of a heat pipe heat exchanger (HPHX) as pre-heater of the absorption system. The prediction was performed by utilizing thermal resistance and ε-NTU method. Numerical modeling used an effective thermal conductivity (keff) without using measured data. Temperature profiles around heat pipes of the HPHX were predicted and compared with measured data. They agreed within the maximum deviation of 16 %. Thermal performances of the HPHX were predicted with the measured data within approximately 4 %. Calculated heat transfer coefficients for the evaporator of the heat pipe showed the similar with the values predicted by the literature correlation, while those inside the condenser of the heat pipe showed larger than the values predicted by the literature correlation.

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