Experimental And Theoretical Study On Performance Of Soil Source Absorption Heat Pump System

By means of the Trnsys simulation platform,this paper established the simulation model of multi well heat transfer model which based on vertical underground pipe and the soil source absorption heat pump system of mathematical model of absorption heat pump unit.The simulation model provides a analysis of factors affecting soil thermal balance of ground source heat pump,and the compression system which aimed at different load cases comparatively analyzed.The increase of buried tube spacing and soil thermal conductivity contribute to slower the variation of long-term running soil system temperature.The decrease of buried pipe spacing will increase the long-term running soil temperature fluctuation range.The influence of thermal conductivity has a little influence on the short term soil temperature within certain range.According to the different situation of cold and heat accumulation in soil,the drilling depth direction will form a certain temperature gradient.Changing the layout of drilling can reduce soil temperature change in the long run to a certain extent.Comparison of two different forms system,the design of buried pipe absorption system are often tend to depend on the summer condition,the design of buried pipe compression system were affected greatly by building load changes,and the design length of buried pipe absorption system are longer than compression system.For the heating-dominated building,absorption system solve the underground soil temperature decreased year by year effectively.For the cooling-dominated or only heating load building,for cooling load or heating load of the building,under the condition of their buried pipe design length,the absorption system and compression system has basically the same influence of soil heat balance.