Study On Application Of Solar Coupled Ground-source Heat Pump System

The solar-coupled ground source heat pump technology combines solar energy with ground source heat pump,that is,The soil is used to convert solar energy,which is abundant in summer and in transitional seasons like spring and autumn,into heat energy and store it underground.It is then removed to provide heat for the building during the heating season.This is not only beneficial to the application of green energy,but also saving primary energy.The way used in this paper is the way of soil heat storage.Gambit software was used to establish different buried pipe models,Vc++ editing UDF program was used to complete the control of inlet velocity and solar radiation time and Fluent fluid simulation software was finally used for simulation calculation.During the simulation process,the temperature changes at the inlet and outlet as well as the surrounding soil temperature changes were detected and analyzed,the data after system equilibrium was finally analyzed.In this paper,the overall soil model is cylindrical and symmetrical,so in order to save computing time,a quarter of the whole model is taken for simulation study,so as to obtain the heat transfer of the whole model.There are two groups of single u-shaped pipes in series with each other,and then they are connected in parallel with the external pipes.The outer side is the backfill material and soil,the parameters of each part are set according to the actual situation.Respectively simulating the buried pipe spacing of 2 m,3 m and 4 m,and the temperature of backwater of 30 ?,35 ? and 40 ?.According to the data obtained from the numerical simulation,we can analyze the effect of different situation on the heating effect.Than we combine with the concrete building heating and analyze its economy and rationality through the corresponding calculation.The shijiazhuang area of hebei province is suitable for this mode because of its abundant solar energy,environmental pollution and energy waste,it not only avoids the defect that the underground soil temperature field cannot be recovered normally caused by the use of GSHP heating alone,but also rationally uses renewable energy,which is beneficial to the long-term effective operation of GSHP,and is worth popularizing in engineering practice.