Abstract
Based on the basic principle of water-heat transferring in aquifer, this paper establishes a three-dimensional couple numerical model of groundwater flow, heat transferring and solute movement in advantage of the significant variation of groundwater density and viscosity coefficient in energy storage and recovery in brackish aquifer. The revised numerical model is applied to predict the evolution process of the groundwater flow and geo-temperature fields in one brackish aquifer energy storage and recovery system in Tianjin Binhai New Area for the next five years. The results show that: the Darcy velocity of fluid increases when groundwater temperature grows in heat storage season in summer and decreases with the descent of groundwater temperature in cold storage season in winter, which brings some influences on the geo-temperature field in brackish aquifers. At the end of the cold storage season in the 5th year, heat transfixion occurs when the water temperature of 3rd pumping well increases for 0.5°C. In conclusion, as the coefficient of hydraulic conductivity having a same change with the geo-temperature and concentration in brackish aquifers when the hydrogeology condition of brackish aquifer remains the same. the coefficient of hydraulic conductivity will increase or decrease for 35% when the groundwater temperature has a 10°C increase or decrease compared to the initial one.
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