| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat utilization system that can enhance energy saving performance.SOLUTION: A heat utilization system 1 comprises an underground heat exchange system 10, a loop pipe 21, a pump 22, a check valve 23, a four-way valve 24, heat pumps 30, and solar heat pumps 31. In the underground heat exchange system 10, a heat medium fluid that is circulated in the loop pipe 21 to exchange heat in heat exchange parts 30a of the heat pumps 30 is stored in double pipes 13. In association with the heat exchange, the temperature of the heat medium fluid increases or decreases, and the temperature of the ground around the double pipes 13 changes. In order to make a recovery from the changed ground temperature, the temperature of the heat medium fluid is first changed in heat exchange parts 31a of the solar heat pumps 31 located in the middle while the heat medium fluid is circulated in the loop pipe 21, and the operation of the solar heat pumps 31 is then stopped to recover the ground temperature using the heat medium fluid with the changed temperature. |
