CFD Simulation of Heat Transfer in Helically Coiled Tube Heat Exchanger for Water Heating

In order to improve the heat transfer in helically coiled tube heat exchanger immersed in the water tank, we have developed a new coupled model containing both domestic refrigerator and water heater. In the numerical simulation, the three dimensional storage tank with immersed helical coil heat exchanger was simplified as an axisymmetric two dimensional model in order to reduce the calculated capacity and a total of mesh volumes. According to the obtained results, this model is able to predict the effect of condenser coil designs on the heating process of the domestic refrigerator coupled with water heating system. The results indicated that the heating characteristics in the variable pitch coil were improved in comparison with that of normal coil.