| 摘要 |
PURPOSE: An open type underground heat exchange system with a return pipe in a bottom of a geothermal hole is provided to improve productivity by uniformly controlling loads on geothermal holes when underground water is supplied. CONSTITUTION: An open type underground heat exchange system comprises a geothermal hole(10), a water feeding unit(20), a heat pump(30), and a return pipe(40). The geothermal hole is bored on the ground. The water feeding unit comprises a supply pumpe(21) and a supply pipe(22), and supplies underground water to the geothermal hole. The heat pump is connected to the supply pipe, and recovers heat from supplied underground water. The return pipe returns the underground water to the geothermal hole from the heat pump. The return pipe comprises unit return pipes, a weight connection socket, and a weight cover. The weight connection socket connects the unit return pipes. The weight cover covers the unit return pipes. The return pipe is dipped in a geothermal return hole(12) by the specific gravity.
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