太阳能-地源热泵系统控制策略及运行特性研究

STUDY ON CONTROL STRATEGYAND OPERATION CHARACTERISTICS OF SOLAR-GROUND SOURCE HEAT PUMP SYSTEM

为解决西北村镇地源热泵系统应用中土壤温度逐年降低的问题,设置太阳能-地源热泵系统(SGSHP),分析SGSHP的适用区域。以某小学为测算对象,使用文献调研、数字化模拟等方法,仿真模拟运行策略。结果表明,农业设施和学校适合采用SGSHP,非供暖季太阳能为土壤补热,供暖季优先太阳能供暖为最佳控制策略,太阳能集热器面积86 m^(2),水箱容积3.9 m^(3),换热器截面积0.4 m^(2),循环泵流量6.6 m^(3)/h,换热管长度120 m,可在1个自然年恢复土壤温度。

In order to solve the problem of soil temperature decreasing year by year in the application of ground source heat pump system in China Northwest villages and towns,a solar assisted system is added,and the control strategy of the solar-ground source heat pump system(SGSHP)is setup,and the applicable areas of SGSHP are analyzed.Taking a primary school as the measurement object,literature research and digital simulation are used to propose and simulate operation strategy.The results show that SGSHP is suitable for agricultural facilities and schools.The optimal control strategy is that solar energy heats soil in non-heating seasons and solar heating is preferred in heating seasons.The optimized area of solar collector is 86 m^(2),and the volume of water tank is 3.9 m^(3).The sectional area of heat exchanger is 0.4 m^(2),and the flow of circulating pump is 6.6 m^(3)/h.The heat exchange tube is 120 m long,and the soil temperature can be restored in a natural year.