Abstract
A numerical study on transient heat transfer of shell and tube type ice thermal storage system is carried out based on the concept of a single u-tube borehole thermal network. Two tubes are arranged in the thermal storage tank in which glycol solution flows in one of the tubes, while a refrigerant flows in the other tube. In this study a boiling heat transfer of the refrigerant is considered to model the heat exchange among the ice storage, the refrigerant and the glycol solution which can be used for air-conditioning application. Temperature variation of all the three substances of the ice thermal storage system (i.e. the ice/water, glycol solution and the refrigerant) with depth has been determined for specified times. Also temperature history of all the three substances has been determined at specific depth of the thermal storage system. Finally the effect of mass flow rate of the refrigerant on the solidification process has been investigated with the numerical method. The transient boiling heat transfer of the refrigerant in the saturated region, the transient single-phase heat transfer process of the glycol solution and the refrigerant at the superheated region, and the solidification process of the ice thermal storage system were all investigated in this study.
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