According to the characteristics of energy storage air conditioning system, a physical model of regenerative process for the energy-storage air conditioning heat storage device(double coil heat storage water tank) was established.Performance testing and energy consumption analysis were completed in consideration of the structure characteristics of the energy storage tank.The results show that installing the heat coil in the upper part of the heat storage tank and making the heat releasing diameter be half of the heat coil diameter can make the heat release process more effective than the traditional, and the double coil immersion heat storage tank can improve the stratifying phenomenon of the traditional single coil structure.Date analysis based on establishing a payback period model of investment confirms that the proposed design has good economic efficiency.