Study On The Solar Heating Storage By PCM Assisted Ground Source Heat Pump System

The positive results of Solar Assisted Ground Source Heat Pump System in china lay particular emphasis on the proportion of two heat source,coupling characteristics and energy-saving analysis,etc,which lacks consideration on matching problem of heating load of building and heat source. When the scale of heating in winter includes rooms in south, heating load is affected by solar radiation, and the load in daytime is less than in night. In addition, because solar energy have characteristics of intermittent and instability ,if it is used as assisted source ,heat storage can be considered.First, in this paper, solar radiation intensity in Shi jia zhuang is researched. The program of total radiation intensity of collectors in vertical surface is made using Matlab. And choosing the least average daily radiation , the analysis of sensible thermal storage was performed, putting forward that if the efficiency of collectors in sensible thermal storage is improved, the volume of thermal storage water tank can be increased to solve it, but it is affected by heat loss and restriction of space. So in this paper, phase change storage is considered as the assisted heat source .Second, according to investigation of phase change material, paraffin of No.20 is considered. Because the process of phase change storage includes moving boundary problem ,there is some limitation in analytical solution. So at home and abroad enthalpy formulation method and effective heat capacity formulation method is used. In this paper effective heat capacity formulation method is used as to solve phase change model. The program of phase change storage is made using Matlab and process of phase change storage is simulated with program of sensible thermal storage. In the condition of constant temperature , characteristics of heat charge and discharge and solar heating storage by PCM are studied.Finally, based on the experimental table, device of phase change storage is built. The instance of benchmark simulation is considered as the designing scheme,and the operation mode of heating storage in daytime and operating device of heat storage combined with GSHPs in night is used. The characteristic of heat charge and discharge of storage of solar energy and the impact on GSHPs is researched.