| How to use clean energy effectively has become a highly concerned issue in today's society.Heat pump technology has been widely applied in most parts of the country.In Western Sichuan,because of many factors,the living standard and quality of the people are relatively low.It is imminent to improve the living standard of the people in the west of Sichuan Province.The Western Sichuan Plateau belongs to the cold region,and the heating demand exists objectively.The Western Sichuan Plateau has abundant solar and groundwater resources.This paper,taking the buildings in the county town in Ganzi area of West Sichuan as the research object,calculated the heat index and the time by hour heat load of typical building design by using Design Builder software and the time by hour heat load calculation method proposed in this paper,compared the calculation results of the two methods.It is found that there is a difference between 5-10%,which proves that the result of the latter has a certain reference value,and puts forward a correction method to add the correction coefficient to the engineering calculation method.Based on the using and weather conditions of the county buildings,a solar underground water source heat pump system is designed.A mathematical model of the groundwater temperature field is set up to simulate the change of the underground water temperature.The calculation results show that the variation of the corresponding groundwater temperature field is up to 5 after ten years of system operation.The temperature of ten years after the fixed point is reduced to 1.55 degrees,showing a trend of decreasing year by year.The heat imbalances caused by the separate groundwater system can be reduced by the cross season heat storage of the solar auxiliary heating system.The simulation model of solar energy underground water source heat pump system is set up with TRNSYS as the simulation platform,and the system performance of two modes in series parallel mode of solar subsystem and underground water source heat pump subsystem under different load side water supply temperature and underground water temperature are simulated and analyzed.On the basis of two different operating modes,the operating conditions of the system in the 36 operating conditions are studied.With the same water temperature,the unit COP will gradually decrease with the decrease of the temperature of the underground water.The increase of the water supply temperature makes the decrease of the unit COP greater than the decrease of the temperature of the underground water.The decrease of the COP of the unit is the water supply.The influence of temperature change on the COP of the unit is greater than that of the underground water temperature.The best operation condition of the system is the water temperature of the load side is 46 degrees.The operation of the unit is stable.The highest COP of the unit is 4.97,and the minimum COP of the unit is 4.78.The energy consumption of parallel operation mode is better than that of series mode operation.The heating mode of the solar energy underground water source heat pump system combines the local natural resources organically,and the unit operates under the best working conditions.The average value of the unit COP reaches 4.88,which ensures the stability of the unit operation,not only satisfies the local heating demand,but also meets the basic national policy of our country. |
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