| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump system utilizing inexpensive underground water with a simplified structure and without causing any trouble such as land subsidence. SOLUTION: In the present heat pump system, there are provided a pumping well (12) and a reduction well (13) in the ground(11) with the aid of a driving method, and underground water in an aquifer (30) pumped from the pumping well (12) is utilized for heat exchange with a refrigerant, and then it is injected into the return well (13) to return to the aquifer (30).
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