UNDERGROUND HEAT UTILIZATION SYSTEM

To provide an underground heat utilization system that allows the number of pumps to be decreased when upper and lower aquifers are utilized.SOLUTION: An underground heat utilization system comprises: a well comprising an upper opening part, a lower opening part, a water chamber inside which groundwater can be stored, and a pump provided inside the water chamber and capable of pumping the groundwater; and a water suction pipe extending from the pump toward a heat exchanger. The water chamber comprises an upper suction valve capable of opening/closing toward the upper opening part, and a lower suction valve capable of opening/closing toward the lower opening part, and is constituted so that when one of the upper suction valve and the lower suction valve is opened, the other is closed.SELECTED DRAWING: Figure 1 【課題】上下帯水層の利用において、ポンプの台数を減らすことができる地中熱利用システムを提供する。【解決手段】地中熱利用システムは、上部開口部と、下部開口部と、内部に地下水を貯留可能な水室と、水室の内部に設けられ、地下水を揚水可能なポンプと、を有する井戸と、ポンプから熱交換器に向かって延びる吸水配管と、を備え、水室は、上部開口部に向けて開閉可能な上部吸込弁と、下部開口部に向けて開閉可能な下部吸込弁と、を有し、上部吸込弁と下部吸込弁とのうち、いずれか一方が開いているとき、他方が閉じるように構成されている。【選択図】図１