To improve durability by basically disposing a protecting means that reduces a bending moment of a branch pipe section with respect to a vertical pipe section.
An air conditioning device 1 using geo-heat heat exchanges heat of external air A with geo-heat heat and supplies the air to the inside of a building. The air conditioning device 1 includes a pipe-like geo-heat heat exchanging part 1A, which is buried in the ground and exchanging heat of external air A with geo-heat heat. The geo-heat heat exchanging part 1A includes branch pipe sections 22A to 22D having vertical pipe sections 25A to 25D that vertically extend and branch pipe sections 26A to 26D that are branched from the vertical pipe sections 25A to 25D and laterally protruding, respectively. The branch section 22 is provided with a protecting means 27 for reducing a bending moment of the branch pipe sections 26A to 26D with respect to the vertical pipe sections 25A to 25D, respectively.
NAKAGAWA HIROSHI
NISHIO KAZUNORI
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