Experimental Investigation of the Heat Transfer Characteristics of a Helical Coil Heat Exchanger for a Seawater-Source Heat Pump

AbstractIn this study, a high-density polyethylene helical coil heat exchanger (HCHE) is firstly adopted by a seawater-source heat pump system (SWHP) and experiments are conducted to determine the thermal performance of the heat exchanger in the Bohai Sea, Tianjin, North China. To study the effects of seawater flow on the convective heat transfer, experiments are performed at the bottom and surface of the seawater. The heat transfer coefficients of the HCHE in seawater are studied in this article in consideration of the flow of seawater. The effects of parameters such as the water-inlet temperature and the velocity in the HCHE on heat transfer are discussed with respect to cooling and heating conditions. In addition, the heat transfer analysis of the HCHE in icy conditions in winter is performed. The results show that 90% of the transferred heat energy is transported on the first 50 m of the HCHE. The external convective heat transfer coefficients under various conditions are calculated iteratively.

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