Heat Transfer Characteristics Research Of The Loop Heat Pipe Solar Water Heating System

Based on the loop heat pipe technology and solar hot water system related theory and experimental research, this paper studies a kind of using the loop heat pipe technology, double-layer vacuum glass plate and endothermic heat pipe wall of the loop heat pipe plate solar hot water system, this system within the loop heat pipe working medium inside the heat pipe cavity heat water evaporation and condensation heat back into the wall of the liquid core, evaporation condensation noninterference, unique design can effectively reduce the contact thermal resistance. The system structure is simple, beautiful, and material consumption, simple and convenient installation steps, to solve the existing solar in installation and operation of the installation program trival, complex operation and so on many issues. In addition, this system has to reduce heat loss and improve the conversion efficiency of solar energy, help to solve the traditional winter in the system of solar heat pipes freeze, such problems as uneven. At the same time, the system of endothermic heat pipe can be closely contact with the balcony metope, on the basis of guarantee the building beautiful sex, realize the real structure and the building integration system.The project completed the research and development of the loop heat pipe wall plate solar hot water, and the heat transfer characteristics were analysed. Through this system structures, experimental platform, the experiment to test and obtain its in system, the temperature parameters of different simulating radiation intensity through analyzing the experimental data for basic data of the system; Theoretical analysis model is established, this system to carry on the numerical simulation and analysis of heat transfer characteristics of the system, and carries on the economic and environmental benefit evaluation, the feasible path for building solar energy hot water supply. In this paper, the main results are as follows:(1) This system in the simulation of the radiation strength under various temperature change tendency, and increase with the increase of the temperature with the radiation intensity. Tank under low simulating radiation intensity eventually reach the temperature of 37℃, ultimately reached under high simulating radiation intensity of temperature is 61 ℃, basically meet the need of daily life with hot water. The efficiency of the solar experiment system is negatively related to the normalization of temperature difference effect is stronger, it is better to return, when simulating radiation intensity of 150 w/m2, maximum efficiency, maximum efficiency is 65%; When simulating radiation intensity of 300 W/m2, minimum heat loss coefficient, is 843.9 W/(℃·m2).(2) The loop heat pipe wall plate solar hot water system with the theory of temperature simulation of the radiation intensity increases, the highest theoretical water temperature is 65.5 ℃. According to the results of theoretical analysis and experimental test, the error is within 10%, the operation of basic conform to the actual test this system.(3) Through the loop heat pipe wall plate solar hot water system and the economic benefits of gas water heaters, electric water heater system were analyzed, it can be seen that during the service life of the period, the solar energy hot water system than gas hot water system saves 984.37 Yuan per year, than in system saves 1224.81 Yuan a year, has the good economic advantage; Through this loop heat pipe wall plate solar hot water system to evaluate the environmental benefits, compared with other two kinds of hot water system, can effectively reduce carbon dust, sulfur dioxide, and nitrogen oxide emissions of pollutants, both the use of renewable energy, and protecting the natural environment.