شبیه سازی و تجزیه و تحلیل عملکرد در کویل کندانسور در بخاری آب گرم بخاری خانگی

A numerical investigation of performance analysis on heat pump water heater (HPWH) was carried out. In this study, a coupling model containing both vapor-compression cycle and water heater was established, in which model of vapor-compression cycle was developed in MATLAB to obtain the heat flux boundary condition for helically coil and then the two-dimensional flow and heat transfer of water tank was simulated by CFD. Water temperature distribution, heat transfer coefficient and COP were three main characteristics to evaluate the performance of HPWH. The results of the coupling simulation showed good agreement with experimental results. Then with help of this coupling model, system performance of variable-diameter coil and constant-diameter coil were compared. Results indicated that heat transfer coefficient of variable-diameter coil was 19.06% higher and average COP was 3.97% higher for this coil type. Hence, it was found that by reducing coil pitch and properly designing coil diameter, maximum temperature difference in altitude direction was no more than 3 °C, average water temperature was about 1 °C higher and Nuw,d was at least 3.05% higher. This work could provide some guideline on optimization of condenser coil designs.