20 September 2011

AIR CONDITIONING SYSTEM WITH GROUNDWATER HEAT PUMP BY AQUIFER THERMAL ENERGY STORAGE (ATES)


The air-conditioning system with groundwater heat pump using the aquifer thermal energy storage (ATES) is still quite rare domestically in Japan. Japan Groundwater Development., Co Ltd (JGD) started utilizing this system in 1983. It creates less heat emissions, which is believed to be one of the major causes of the heat island effect than
conventional systems. However, we realized that we do not have sufficient data to prove this system is actually
environmental load reducing. Therefore we have decided to reevaluate its environmental load and impact by monitoring groundwater consumption, groundwater temperature and amount of electrical energy. Five wells were situated, three for studying the influence to the ground and groundwater, the other two with the temperature sensor and the water level indicator for the background
information. From these results, we have reevaluated the change in ground temperature caused by inter annual operation of this system.