JP2003302109A - Underground heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground heat exchanger capable of obtaining high heat collection efficiency as compared with a conventional polyethylene underground heat exchanger and capable of collecting a large amount of heat and cold. SOLUTION: An upper end and a lower end of a plurality of straight pipes (1) made of a material having higher thermal conductivity than polyethylene, which are arranged in parallel, are respectively connected to a hollow container (2) and a hollow container (3),
The straight tube (4) is connected to the upper hollow container (2), and the straight tube (5) is connected to the lower hollow container (3), and the hollow portion is formed as a series.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground heat exchange using a material having a high thermal conductivity and having an increased contact area in order to efficiently collect underground heat. It is about a vessel. 2. Description of the Related Art Conventionally, a polyethylene U-shaped tube or a double U-shaped tube has been used as an underground heat exchanger inserted into a heat collecting hole. [0003] This has the following disadvantages. I. Since the thermal conductivity of polyethylene is lower than the thermal conductivity of the ground, the transfer of underground heat to the heat transfer medium was hindered. B. Due to the small contact area with the ground, sufficient heat was not given to the heat transfer medium in the pipe. C. Heat collection efficiency was kept low due to Lee Ro. The present invention has been made to solve these disadvantages. [0004] A plurality of straight pipes (1) made of a material having higher thermal conductivity than polyethylene are arranged in parallel. Then, the upper end of the straight pipe (1) is connected to the hollow container (2), and the lower end is connected to the hollow container (3). Further, a straight pipe (4) is connected to the upper hollow container (2), and the lower hollow container (3) is connected.
And a straight pipe (5). At this time, the joining is performed so that the hollow portions are formed in series, and the end (6) of the straight pipe (4) and the end (7) of the straight pipe (5) are left open. The present invention is an underground heat exchanger having the above configuration. An embodiment of the present invention will be described below. (B) Open a hole in the upper hollow container (2),
The straight pipe (4) is connected so that is continuous. The joining position is appropriately determined depending on the condition of the heat sampling hole to be used. (B) Open a hole in the lower hollow container (3),
The straight pipe (5) is connected so that 0) is continuous. In FIGS. 1-4, a straight tube (5) is connected to the center of the upper surface of the lower hollow container (3) because a donut-shaped hollow container (2) is used in the upper portion. Can be connected to the side or lower surface. (C) A plurality of straight pipes (1) made of copper, aluminum or the like having higher thermal conductivity than polyethylene are arranged in parallel with each other. The diameter of the tube and the number of tubes used are determined as appropriate. (D) A hole is made in the lower surface of the hollow container (2) processed in (a), and the upper end of the straight pipe (1) is connected so that the hollow portion (9) is continuous. Similarly, the lower end is connected to the upper surface of the hollow container (3) processed in (b). (E) Welding and joints are appropriately used for the joint (8) in accordance with the material in order to ensure airtightness. When the present invention is used in the above structure, the underground heat exchanger (13) of the present invention is used by inserting it into a heat sampling hole (12) drilled in the ground (11). The open end (6) of the underground heat exchanger (13) of the present invention is connected to the heat transport medium forward path (1).
A pipe serving as the heat transporting medium return path (15) is connected to the pipe serving as 4) and the end (7), and water and antifreeze are circulated. In the hole (1
6) may be filled with cement or gravel or filled with groundwater. Water and antifreeze flowing from the heat transport medium outward path (14) through the straight pipe (4) are distributed in the hollow vessel (2), flow down in the straight pipe (1) having a high thermal conductivity and a large specific surface area, and quickly. It is heated and cooled by the warm or cold heat of the ground. The water and antifreeze flowing down are collected in the hollow container (3) and rise up the straight pipe (5) to reach the heat transport medium return path (15). The heat-exchanged water and antifreeze are taken out of the heat transport medium return path (15) and used as a hot / cold heat source. By using the present invention, a higher heat collection efficiency can be obtained as compared with a conventional polyethylene underground heat exchanger, and a large amount of heat and cold can be collected.

[Brief description of the drawings] FIG. 1 is a perspective view of the present invention. FIG. 2 is a plan view of the present invention. FIG. 3 is a perspective sectional view taken along line a of FIG. 2; FIG. 4 is a sectional view of a heat collecting hole showing a use state of the present invention. [Explanation of symbols] 1 straight pipe 2 hollow container 3 hollow container 4 Straight pipe 5 Straight pipe 6 end 7 end 8 Joint 9 hollow part 10 hollow part 11 Ground 12 Heat collection hole 13 Underground heat exchanger 14 Outbound heat transfer medium 15 Heat transport medium return path 16 Inside the hole

Claims (1)

Claims 1. An upper end and a lower end of a plurality of straight pipes (1), which are made of a material having higher thermal conductivity than polyethylene, are arranged in parallel with a hollow container (2) and a hollow container (3). ), A straight pipe (4) is connected to the upper hollow vessel (2), and a straight pipe (5) is connected to the lower hollow vessel (3).