Use Of Groundwater For Residential Central Air Conditioning System

Based on illuminating the urgency and significance of energy conservation and indoor air quality in residential air-conditioning, the benefits from the utilization of natural cooling / heating sources are illustrated. Then two air-conditioning systems using groundwater, Groundwater-Source Residential Central Air-conditioning System (GSRCAS) and Aquifer Thermal Energy Storage Residential Central Air-conditioning System (ATESRCAS), are proposed.Groundwater-source Residential Central Air-conditioning System that is invented by Changde Tianshu Air-conditioning Company Ltd. is tested. After analyzing the testing data, the conclusions are reached to: (a) it is a "green" air-conditioning system which is energy-conserving and pollution-free; (b) to accommodate future demands of residents, the system must improve on indoor air quality and fulfill heating in the winter.To reach the above improvements, a new system named as Aquifer Thermal Energy Storage Residential Central Air-conditioning System is proposed. And its technological feasibility and design principles are discussed.On the base of the basic concepts of aquifer thermal energy storage (ATES), the mathematical models of the ground part and their dimensionless forms are presented. Adapting a special model (Steady Flow Model), a computer program, GWSF (Ground-Water Simulation File), is used to simulate the ground part of ATESRCAS. Making use of the computer program, the results of ATES when sole-house reinjection and ten-house central reinjection under three different reinjection temperature are in practice are thus simulated respectively. Through the analysis of simulation results, (a) the efficiencies of ATES under sole-house reinjection and ten-house central reinjection are contrasted, and the benefits of central reinjection are discussed; (b) the results of ATES under big groundwater flow small reinjection temperature difference and small groundwater flow-ii -big reinjection temperature difference in operation are compared, then advantages of small groundwater flow big reinjection temperature difference in operation are set forth; (c) the effects of geologic conditions on ATES are discussed, then the solving technological measures are proposed.