JPH0132428B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an underground heat generating system for heating and cooling using geothermal heat, which maintains an almost constant underground temperature throughout the year (approximately 14 degrees Celsius at 10 meters underground in Tokyo). Relating to a switching device.

[Background technology]

Conventionally, as shown in Fig. 1, a heat exchange pipe 1 with a substantially U-shaped conduit was directly buried in the soil, but as shown in Fig. 2, the outer periphery of the heat exchange pipe 1 was A space 6 is likely to be formed between the heat exchanger pipe 1 and the soil 5, and the heat resistance increases due to the heat insulating space 6 holding the air, which deteriorates the heat exchange efficiency between the inside of the heat exchange pipe 1 and the heat in the soil. Ta. For example, if the thickness of the space 6 is 0 mm, the amount of heat acquired is 100%.
When the thickness of the space 6 is 2 mm and 4 mm, it decreases to 81% and 63%, respectively. This space 6 is small above the heat exchange pipe 1 due to earth pressure, but since a foundation 7 was placed below the heat exchange pipe 1 to prevent its deformation, the heat exchange pipe 1 does not sink and the space 6 There was a tendency for it to gradually become larger.

[Purpose of the invention]

The present invention was made in view of the drawbacks of the conventional examples described above, and eliminates the space created between the soil and the heat exchange pipe when the heat exchange pipe is buried in the soil. The purpose is to improve heating and cooling efficiency by improving heat conduction between the two.

[Disclosure of the invention]

Reference numeral 1 denotes a metal heat exchange pipe having a conduit bent into a substantially U-shape, and the outer periphery of the heat exchange pipe 1 is a flexible pipe having a diameter larger than the outer diameter of the heat exchange pipe 1 over the entire length. It is surrounded by a soft pipe 2 made of film and has a double pipe structure. This heat exchange pipe 1 is placed on a foundation 7 by digging soil 5 and exposing the pipe ports 3 at both ends to the ground surface.
It is buried in the soil by backfilling soil 5. Next, soil 5
After compacting the soft pipe 2, a fluid thermally conductive medium 4, such as water, is injected into the gap between the outer periphery of the heat exchange pipe 1 and the inner periphery of the soft pipe 2 from one end of the soft pipe 2. Close and block. As a result, the soft pipe 2 is brought into close contact with the soil 5, and the thermally conductive medium 4 is filled between the soft pipe 2 and the heat exchange pipe 1, so that heat is transferred between the soil and the heat exchange pipe 1. This allows you to move smoothly between them. For example, when using water, the thermal resistance of water is less than one-twentieth that of air, so even if the water layer is 4 mm thick, the amount of heat acquired in the air space is equivalent to 0.2 mm (98 %).

Air or water is forced into the heat exchange pipe 1 through one pipe port 3, and heat is exchanged with geothermal heat in the heat exchange pipe 1 in the soil.In the summer, the air or water is cooled and the other pipe port 3 and used for air conditioning, and in winter it is used for heating air or water by heating it.

〔Effect of the invention〕

Since the present invention is constructed as described above, the space created between the heat exchange pipe and the soil during construction can be filled with a thermally conductive medium filled in the soft pipe, thereby eliminating air space. This has the advantage of preventing the occurrence of heat exchange and improving heat exchange (cooling and heating) efficiency. Further, since the thermally conductive medium has fluidity, it can be injected into the soft pipe after the thermally conductive pipe is buried in the soil, which has the advantage of easy construction.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional example, FIG. 2 is an enlarged sectional view taken along the line X-X of FIG. FIG. 2 is an enlarged sectional view taken along YY line. 1...Heat exchange pipe, 2...Soft pipe, 3...
...Pipe opening, 4...Thermal conductive medium, 5...Soil.

Claims (1)

[Claims] 1. The outer periphery of a heat exchange pipe with a substantially U-shaped conduit is surrounded by a flexible soft pipe over the entire length, and this heat exchange pipe is buried in the soil, with the pipe ports at both ends connected to the ground surface. An underground heat exchange device characterized in that the outer periphery of the heat exchange pipe and the inner periphery of the soft pipe are then filled with a fluid thermally conductive medium to bring the outer periphery of the soft pipe into close contact with the soil. Buried construction method.