Study On A Technology Of Heat Pump Coupled With Seasonal Thermal Energy Storage In An Aquifer

Heat pump coupled with Seasonal Thermal Energy Storage in an aquifer is a technology of combining heat pump air-conditioning system with Aquifer Thermal Energy Storage (ATES), which uses shallow underground water as the heat source (or sink) for space heating (or cooling), and then recharges the cooled (or warmed) ground water into the underground and stored to provide the heat sink (or source) for the next summer (or winter).The principle and type of ATES technology, several hydro geological parameters of aquifer, theory which the simulation model of aquifer based on and the numerical method was introduced in this paper. The Heat Pump coupled with two wells'ATES system of Tianjin Mining Jewellery Firm was studied. The changes in Geo-temperature field from winter of 2002 to summer of 2005 and four years later were simulated by Flowheat1.0. Then the energy storage effectiveness of the system and the impact on underground environment were discussed according to the simulation results. The Geo-temperature fields of different models were also simulated which included different spacing of wells, and different hydro geological parameters. Also, how these factors affected the energy storage effectiveness was analyzed. Moreover, the influence that the groundwater dynamic field (natural flow of groundwater and well flow) hade on the energy storage effectiveness was studied. According to the measured data, the Energy Storage Efficiency of the system were defined and calculated, the energy storage effectiveness of the system was evaluated according to the value of energy storage efficiency. The COP (Coefficient of Performance) and electricity consumption of heat pump with and without ATES system were caculated and compared. At last several advices were given for the application of the technology of heat pump coupled with ATES.