| 摘要 |
PROBLEM TO BE SOLVED: To improve workability by enabling going and returning heat collecting pipes to be identified by visual observation during burial construction.SOLUTION: Provided is a heat collecting pipe 1 for earth thermal in which upper ends 1a of a plurality of sets of going-side heat collecting pipes 1A and 1C and returning-side heat collecting pipes 1B and 1D, which are buried in the ground, are connected to going ground piping 15 and returning ground piping 16. A fluid is flowed into the heat collecting pipes so that heat exchange can be performed between the heat collecting pipes and an environment around the heat collecting pipes. The going-side heat collecting pipes 1A and 1C and the returning-side heat collecting pipes 1B and 1D are provided with identification means for identifying going-side heat collecting pipes and returning-side heat collecting pipes, respectively. |
