| 摘要 |
PROBLEM TO BE SOLVED: To securely suppress the arising of a problem associated with a short circuit made because the interval between an outgoing pipe and a return pipe is narrow.SOLUTION: An underground heat exchanger having three or more pipes inserted in an excavation hole formed perpendicularly in the foundation and having pipe axial directions along a perpendicular direction includes three or more support parts which support the three or more pipes respectively. The support parts hold the three or more pipes on the circumference of a virtual circle having a normal direction in the perpendicular direction. |
