| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground heat exchanger capable of being applied to buildings such as a detached house, a multiple dwelling house and a building, in particular, remarkably increasing a coefficient of performance of energy. SOLUTION: In this underground heat exchanger having a structure that a double pipe of a structure obtained by freely fitting an inner pipe opened at its both ends into an outer pipe sealed at its tip end and opened at the other end is buried in the ground in a state that the tip end of the outer pipe is directed downward, and the air is allowed to flow to a clearance between the inner pipe and the outer pipe to exchange the heat with geothermal heat, the outer pipe is buried in the ground by an underground depth of 5 m, and a heat insulating material is laid on an outer peripheral part of the outer pipe and its peripheral area from the earth's surface to an underground depth of 0.3-1 m. Further the heat insulating material is inserted between the outer peripheral face of the outer pipe and the earth's surface by an underground depth of 0.5-1 m to insulate the heat. COPYRIGHT: (C)2006,JPO&NCIPI
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