The performance of air-cooled heat exchangers consisting of several kinds of tubes were experimentally investigated and compared in this study. The experiments were performed with the heat exchanger installed in the inner unit of an actual air-conditioner for residential use. It was confirmed that the heat capacity of the heat exchanger consisting of inner grooved tubes during condensation was evidently higher than that of smooth tubes and significantly affected by the deformation of the groove profile due to the tube expanding with bullets. For evaporation, the capacity of the heat exchanger consisting of inner grooved tubes was approximately equal to that of the smooth tubes and the effect of the deformation on the capacity was smaller than that during condensation.
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