| Aiming at the phenomena of poor heating capacity,serious energy consumption and easy frost in winter heating of air source heat pump system in cold areas,this thesis puts forward the two heat sources of solar energy and air source.By switching the combined heating heat pump system,the experimental equipment and test device are built in the laboratory,and the simulation model is established by using TRNSYS software,The simulation system analyzes the operation characteristics and energy consumption during heating in the laboratory.The accuracy of the model is verified by comparing the experimental data with the simulation data.The system is analyzed and optimized by the combination of experiment and simulation.The experimental equipment parameters and control strategy of dual heat source heat pump are optimized and analyzed.The experimental results show that the dual heat source compound heat pump system has better economy and environmental protection than the single air source winter heating in Handan area.According to the experimental data,the maximum outdoor temperature of air source heat pump system on January 2 is 4.4℃,and the maximum solar radiation intensity is 452 w/m~2.The maximum outdoor temperature of the system is 4.8℃on January 3,and the maximum solar radiation intensity is 480 w/m~2.The heating situation of the laboratory in winter is simulated by TRNSYS software.The results show that the solar water source heat pump system operates for 1712h and the solar heat pump system operates for 1098h in the whole heating period.The monthly average COP(November to March)of the dual heat source heat pump system in the heating period is 2.88,2.66,2.76,3.12 and 3.13,and the monthly cumulative power consumption is 332.21,1281.62,1227.17,888.8 and 150.65.Using TRNSYS software to change the equipment parameters of the experimental equipment and the control strategy of the heat pump system,it is concluded that according to the heating situation of the laboratory,the inclined angle of the solar flat plate collector should be 30°～40°,the solar flat plate collector should adopt 4 flat plate collectors,the volume of the hot water storage tank should be 1m3,and the flat plate collector should be opened when the inlet and outlet water temperature difference is greater than 3℃,When it is less than 0℃,the water source heat pump system should be turned on when the temperature of the heat storage tank reaches 6℃.Finally,compared with the single air source heat pump system,the system has better economy and environmental protection. |
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