Abstract
In this study, a coil heat exchanger with an ice storage system is analyzed by theoretical analysis, numerical analysis, and experimental analysis. The dynamic characteristics of ice thickness variation is studied by means of unstable heat conduction theory in cylindrical coordinates, and the change rule of the ice layer thickness is obtained. The computational fluid dynamics method is employed to simulate the flow field and ice melting process of the coil heat exchanger. The effect of the agitator height on the flow characteristics and heat transfer characteristics is investigated. The numerical results show that the turbulence intensity of the fluid near the wall of the heat exchanger is the largest with an agitator height of 80 mm. Furthermore, the process of ice melting is analyzed. The ice on the outer side of the evaporator tube close to the container wall melts faster than the inner side and this agrees well with the experimental result. The experimental study on the process of the operational period and deicing of the coil heat exchanger is conducted and the temperature variation curves are obtained by the arrangement of thermocouples. It is found that the temperature of the evaporating tube increases with increasing height in the process of ice storage.
Highlights
Coil heat exchangers have many advantages and superior performance, and they exist widely in many engineering fields for enhanced heat transfer
The purpose of this paper is to develop the practical application of ice storage based on the analytical solution
The solidification and melting model is used for the phase change of the coil heat exchanger with an ice storage system
Summary
Coil heat exchangers have many advantages and superior performance, and they exist widely in many engineering fields for enhanced heat transfer. The study of coil heat exchangers is significant to the optimization of engineering problems. Marija et al [1] analyzed the performance of a helical coil heat exchanger by experiment, and the different operating conditions were discussed. Ghorbani et al [2] established the coiler experimental model, and the convective heat transfer of a coiler was studied. Based on the experimental data, the relationship between geometric size, operating conditions, and heat transfer performance were analyzed. Al-Hasan et al [3] studied the coiled heat exchanger, which is embedded in a packed bed of spherical glass particles. In [4], the effects of the coil pitch and the curvature ratio on the pressure drop and heat transfer behavior were analyzed experimentally with the Al2 O3 /water nanofluid laminar flow
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