| 摘要 |
<p>An outer pipe (11), which is buried under the ground, is provided, and a heat transfer pipe (12), in which heat exchange fluid flows, is inverted into the outer pipe (11). A heat medium (13) is sealed in the outer pipe (11). At least a part of the heat transfer pipe (12) is formed by a flat body (12e, ...) that is formed by a flat pipe (12e, 14) or a composite pipe (15) in which a plurality of pipes (15a) are arranged in a flat shape. A flat side of the flat body (12e, ...) contacts an inner peripheral surface of the outer pipe (11).</p> |
