a numerical and experimental investigation of flow and heat transfer in a gas- liquid thermosyphon heat exchanger THE with built in heat pipes and aluminum plate fins for moderate Reynolds numbers has been carried out.. It s module is composed of 6 rows and 15 columns copper pipes with aluminum plate fins with dimensions of 130cm height , 47cm width and 20cm depth . The tubes have been filling by water with filling ratio of 30%, 50% and 70%. The density and thickness of fins are 300 fin/m and 0.4mm, respectively. The configuration of tubes is in-line with 30mm pitch. This paper presents the distribution of temperature and thermal performance of THE by using CFD modeling. A good comparison of the present CFD modeling results for the modeling thermosyphon heat exchanger with experimental results of hydrodynamic and thermal behavior achieved.

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