Model Establishment And Simulation Analysis Of The Heat Exchanger Solar Water Heater

With the background of the rapid growth of economic, an urgent problem which is the excessive consumption of energy will be needed to solve by mankind.The new energy industry is driven by national policy, which increasingly powerful. In the development plan of our country, it is clearly stated to promote the development of solar thermal utilization vigorously, especially for solar water heaters. The solar water heating industry has broad prospects for development. Currently, there are two kinds of solar water heater have been wider application which are all-glass vacuum tube and flat plate solar water heater. These two water heaters have a lot of inadequacies. They had poor efficiency. Water cleanliness cannot be guaranteed. And hot water use is not continuous. Therefore, a heat exchanger solar water heater will be designed in response to those issues.Firstly, the load condition has been set. We designed heat exchanger solar water heater based on heat transfer theory and practical application of engineering. We determined the size and model of each component and completed the heat exchanger solar collector’s experimental platform structures. Secondly, we analyzed the fluid heat transfer characteristics according to the physical model. We established a corresponding mathematical model, including the all-glass vacuum tube model, vacuum tube and tank model, and system models. Thirdly, the associated heat transfer parameters would be tested through experimental platform. It include the fluid temperature variation within the water tank insulation, different flow rates coil inlet and outlet fluid temperature variation. The results prove that the theoretical calculations and measured values are more consistent. The error range of tank temperature is2%to4%. The error range of coil outlet temperature is5%. Then, we established reasonable and correctness of the mathematical model. Finally, we used the finite element method to analyze the internal heat transfer process of the coil heat exchanger. A deviation is appeared between the coil outlet temperature and measured temperature. The deviation range is from3%to5.6%. The visualization of coil heat transfer effects can be achieved by cloud map of the temperature.