JPH0960982A - Radiating pipe arrangement for utilization of geothermal energy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiating pipe arrangement for utilization of geothermal energy, in which outgoing heat is made uniform in distribution over an entire area where a radiating pipe is laid and which is much effective in, for example, elimination of uneven melted snow on the road surface and uneven temperature distribution in floor heating and the like. SOLUTION: A radiating pipe arrangement for utilization of geothermal energy permits discharge of heat retained by a heat medium M which is indirectly heated by a heat exchanging concentric duplex tube 1 embedded vertically under the ground. A radiating pipe 9b is provided to weave on a plane in a hairpin-like manner, and a feed side portion 9d amounting to a half the full length of the radiating pipe 9b is made adjacent to and in parallel to a return side portion 9e amounting to the remainder of the full length of the radiating pipe 9b over the full length of the feed side portion 9d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiation pipe arrangement structure which utilizes abundant low level geothermal power that does not change throughout the four seasons, such as air conditioning, hot water supply, hot water pool, plant cultivation, animal breeding, and snow melting.

[0002]

2. Description of the Related Art Conventionally, although abundant in quantity, which is sprinkled in various places, the use of low-level geothermal heat, especially low-level hot water is pumped from the underground, air conditioning, hot water supply, hot water pool, plant cultivation, etc.
Effective utilization for animal breeding, snow melting, etc. has not progressed so much. The main reason for this is that the amount of groundwater pumped out during use is large, which causes ground subsidence and groundwater reduction, and difficulty in wastewater treatment and management.
There is a risk of causing environmental damage and pollution.

As a countermeasure, a heat exchanger for geothermal heat extraction is buried underground and water or other heat medium is sent to the heat exchanger.
Indirect heat exchange between the heat source and the heat medium via the heat transfer surface, collecting the heat source and using it for snow melting, as an array of heat sink tubes, the heat sink tubes generally meander in a hairpin shape on the horizontal surface of the asphalt layer of the road. Are used.

However, in the conventional arrangement structure of the radiation pipes utilizing geothermal heat, since the temperature of the heat medium in the radiation pipes decreases as it goes downstream, unevenness occurs on the asphalt layer or in the amount of heat radiation, resulting in uneven snow melting. There is a problem to say.

[0005]

The problem to be solved is that in the arrangement structure of the radiation pipes utilizing the geothermal heat, the temperature of the heat medium in the radiation pipes 9b decreases as it goes downstream.
The present invention provides a geothermal heat dissipation pipe array structure with less unevenness in the distribution of heat radiation, which solves the above-mentioned problems because unevenness occurs in the amount of heat radiation on the asphalt layer and unevenness in snow melting.

[0006]

The invention according to claim 1 is a heat dissipation using geothermal heat for radiating the heat held by a heat medium M indirectly heated by a concentric double tube for heat exchange 1 vertically buried in the ground. In the tube arrangement structure, the radiating pipe 9b is meandered in a hairpin shape on a flat surface, and the sending side portion 9d corresponding to half of the entire length of the radiating pipe 9b and the remaining return side portion 9e are adjacent to each other over the entire length and are parallel to each other. They are arranged side by side.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
1 to 3, reference numeral 1 is a concentric double pipe for heat exchange vertically buried in the ground for collecting geothermal heat, and a heating medium M of 20 to 25 liters / min is provided below each concentric double pipe. The heat medium M is heated by the geothermal heat while being inverted and guided upward, and then sent to the heat radiating section 9 for melting snow on the road. The outer pipe (diameter 90 mm), the inner pipe (56
Both are made of hard polyethylene.

Reference numeral 2 denotes a heat medium supply pump, and one unit is provided for 14 to 6 concentric double tubes except for a spare (one of two units is a spare), and 3 is a heat medium M. A heat medium circulation path for circulation, 3a is a feed pipe main pipe, 3b is a return pipe main pipe, 3d is a flow meter, and 3e is an automatic air bleeding valve. Reference numeral 4 denotes an expansion tank communicating with the heat medium circulation path 3 for absorbing a volume change of the heat medium M, 4
a is a pressure gauge, 4b is a relief valve, 4c is an automatic air bleeding valve, 5
Is a pressure switch for stopping the operation of the pump 2 when a pressure lower than the set pressure lower limit value due to leakage of the heat medium M or the like is detected.

Reference numeral 9 is a heat radiating portion for passing through the heat medium M sent from the plurality of concentric double tubes 1 to radiate heat to melt snow or the like, and three headers 9a and a plurality of heat radiating tubes 9b are connected. It is a thing. More specifically, as shown in FIG. 1 to FIG. 3, each radiating pipe 9b has the radiating pipe 9b meandering like a hairpin on a flat surface, and the remaining portion of the radiating pipe 9b and the feeding side portion 9d that corresponds to half the entire length of the radiating pipe 9b. And the return side portion 9e of the above are arranged parallel to each other along the entire length.

When one of the heat medium circulation pumps 2 is driven, the heat medium M is distributed to each concentric double pipe 1 through the heat medium circulation passage 3 and is fed downward by the inner pipe of each concentric double pipe 1. Then, it is inverted and guided by the inside of the outer tube, and is heated by receiving geothermal heat. The heat medium M exiting each concentric double pipe 1 is sent to the heat radiating section 9 through the feed pipe main pipe 3a of the heat medium circulating passage 3 and distributed to a plurality of headers 9a. After being distributed to the heat radiation pipes 9b and used for snow melting or the like, the heat medium circulation pump 2 returns them to the respective concentric double pipes 1 through the return pipe main pipe 3b.

Meanwhile, 20 to 25 per concentric double tube
When the heating medium M is controlled to flow at liter / min and the volume of the heating medium M changes due to temperature change, the change in volume is absorbed by the expansion tank 4. Further, when the pressure lower than the set pressure lower limit value due to leakage of the heat medium M or the like is detected, the pressure switch 5 is activated and the operation of the pump 2 is stopped.

In particular, as shown in FIG. 2, each radiating pipe 9b is meandered in a hairpin shape on a flat surface, and a sending side portion 9d corresponding to half of the entire length of the radiating pipe 9b and the remaining return side portion 9e.
Since and are arranged side by side in parallel over the entire length,
The highest temperature part and the lowest temperature part are arranged in parallel, the intermediate temperature part is arranged in parallel in the turnaround area, and the heat radiation amount part is made uniform throughout, so that, for example, uneven snow melting when used for snow melting on the road surface is eliminated. The arrangement structure of this radiation pipe is also effective for floor heating. FIG. 3 shows three heat radiation tubes 9b arranged side by side.

[0013]

Since the present invention is configured as described above,
The heat radiation amount distribution is made uniform over the entire area where the heat radiation pipes are laid, and it is extremely effective in, for example, eliminating uneven snow melting on the road surface and eliminating uneven temperature in floor heating.

[Brief description of drawings]

FIG. 1 is a device configuration diagram showing an embodiment of the present invention.

FIG. 2 is a plan view showing a main part of an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment in which three radiating pipes are connected to a header.

[Explanation of symbols]

 1 concentric double pipe 2 pump 3 heat medium circulation path 3a feed pipe main pipe 3b return pipe main pipe 3d flow meter 3e automatic air vent valve 4 expansion tank 4a pressure gauge 4b relief valve 4c automatic air vent valve 5 pressure switch 9 heat dissipation part 9a Header 9b Radiating tube 9d Sending side part 9e Returning side part M Heat medium

Claims (1)

[Claims] 1. A geothermal heat radiation pipe array structure for radiating the retained heat of a heat medium (M) indirectly heated by a concentric double pipe for heat exchange buried vertically in the ground (radiation pipe) While making (9b) meander like a hairpin on a flat surface, the sending side portion (9d), which corresponds to half of the entire length of the heat radiating tube (9b), and the remaining return side portion (9e) are arranged side by side in parallel along the entire length. Arrangement structure for geothermal heat dissipation pipes.