Study and optimization of heat transfer performance of multi-heat source water tank with double helical tubes

 Helical tube water tank is the core component of multi-heat source heating system, and its heat transfer effect has a great influence on the performance of whole system. In order to optimize the structure of multi-heat source double helical tube water tank, establishes a model by the ICEM and Fluent modules of ANSYS software, and verifies the accuracy of the model by experiments. Studies the effects of the flow direction of the fluid in the helical tubes of the main body in the water tank, the position of the straight inlet tube of the water tank and the outlet direction of the water inlet, the diameter of the straight inlet tube of the water tank and the height-diameter ratio of the water tank on the heat transfer performance of the water tank. The results show that adjusting the flow direction of the working fluid in the helical tube to countercurrent and the direction of the inlet tube can form a wider range of high temperature and low temperature areas. Expanding the diameter of the straight inlet tube can increase the intake water temperature of domestic hot water and increasing the height-diameter ratio of the water tank is beneficial to form a wider range of hot and cold zones.