Study On Operation Strategy And Energy Saving For GSHP System With A Mixing Water Storage Device

After decades of development, the technology is more mature, but there are still some problems. The most prominent is the overflow issue caused by recharging blockage such as suspended solids, the growth of microorganisms. It directly affect GSHP system can run well and groundwater resources wasted or not. Preprocessing on groundwater and pickling makes a lot of damage for wells, and none solve the recharge problem fundamentally. This paper choose from the view of relieving recharge load and improving the quality of recharge to analyze recharge problem. Using the new mixing water storage device to reduce the instantaneous flow rate and total amount of water flow rate of recharging groundwater and recharge load. Using the mixing and storage technology and the deep well pump frequency conversion technology to guide the GSHP system operating and to save energy.First, this paper introduces the system structure and the mixing and storage technology of GSHP system with a mixing water storage device. Using the mixing and storage technology, groundwater will be stored and reused for heat transfer when heat load is small. When the heat load become large,we can still use the heat exchanged groundwater mix with deep well pumped groundwater in mixing storage pool, then enter the heat pump unit for heat exchanging. The mixing storage pool stored part of the groundwater that can not be recharged immediately after heat exchanging and be recharged in the late, that can reduce the instantaneous flow rate and relieve the dependence on heat pump system with pumping wells and recharge wells.Using the mixing and storage technology will cause the inlet temperature of theheat pump units in groundwater side deviates from the design value, and make some impact on the energy efficiency of heat pump. It increases energy consumption of heat pump, but saves part of energy consumption of deep well pump for transporting fluids.For different loads, the new GSHP system operating mode is divided in different form,then using FLUENT 6.3.26 to simulate the value of the inlet temperature of heat pump units in groundwater side caused by the different operating modes. Secondly, through the establishment of a heat pump system model and compared to test results, this paper obtained the heat pump units energy efficiency influence of the system external parameters change at different capacity of units, such as inlet temperature of the heat pump units in groundwater side and in the users side, then use Visual Basic6.0 make the calculation results visible. Finally, after the establishment of pump energy consumption model, this paper obtained energy consumption of variable frequency submersible pumps in different operating modes.In this paper, through calculating the energy consumption of the heat pump system under different operating modes in cooling season and heating season, and comparing to the traditional GSHP system, gives the optimal control strategy of GSHP system with a mixing water storage device. The results show that the system reduces the total energy consumption in the case of system also greatly reduces the amount of deep well pumping flow rate, effectively alleviate the recharge pressure.