Abstract
In order to solve the problem of soil thermal imbalance of ground source heat pump (GSHP), a new method of using heat source tower (HST) to absorb heat from air and store heat to soil through borehole heat exchange (BHE) in summer was proposed. The finite element iteration calculation of heat and mass transfer of HST was realized by MATLAB. The results show that the heat storage capacity increases obviously with the increasing of air temperature and relative humidity and the decreasing of soil temperature. Increasing the number of BHE and reducing the water flow rate of each BHE are also beneficial to heat storage. Among the total heat storage, the ratio of air latent heat even reaches 70%. Under the average meteorological parameters in July of Changchun and the water flow rate of 5 kg/s in HST, the heat storage demand of a 1000 m2 building can be completed in 34 days and the coefficient of performance (COP) of the HST system is up to 27.54. Heating the soil out of season by HST is a high efficiency and low cost method to solve the problem of soil thermal imbalance of GSHP.
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