JP2006317055A - Underground heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground heat exchanger improved in heat exchange efficiency and durability. <P>SOLUTION: The underground heat exchanger A comprises a soil cement wall 10 constructed underground from the ground surface GL, and a tube assembly 20 embedded in the soil cement wall 10 so that the respective upper ends of an inflow tube 21 and an outflow tube 22 are exposed from the ground surface GL. The tube assembly 20 has a plurality of thin inflow tubes 23 thin compared to the inflow tube 21 and connected in communication with the lower end of the inflow tube 21, and a plurality of thin outflow tubes 24 thin compared to the outflow tube 22 and connected in communication with the lower end of the outflow tube 22 and the outflow side ends of the thin inflow tubes 23 respectively. A medium can flow from the upper end of the inflow tube 21 to the upper end of the outflow tube 22 through the inflow tube 21, each thin inflow tube 23, each thin outflow tube 24 and the outflow tube 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention absorbs heat from the underground through the underground heat exchanger, that is, a medium (for example, air, water, etc.) flowing from the inflow pipe to the outflow pipe of the pipe assembly embedded in the ground. The present invention relates to an underground heat exchanger capable of releasing heat.

This type of underground heat exchanger is disclosed in Patent Document 1 below, for example. The underground heat exchanger described in Patent Document 1 includes two forward pipes that allow a medium to pass from the surface side toward the deep underground, and a medium that has passed through these forward pipes on the ground side as heat transfer pipes. These are provided with two return pipes that pass toward the center, and these are arranged in a vertical shaft having a circular cross-sectional shape, with the center-to-center distance being all equal.
Japanese Patent Application Laid-Open No. 11-182942

  In the conventional underground heat exchanger described above, heat is exchanged mainly at the lower ends of the two outgoing pipes and the lower ends of the two return pipes. By the way, the two forward pipes and the two return pipes have the same pipe diameter from the upper end to the lower end, and are arranged so as to be bundled in a circular vertical shaft in a state where the center-to-center distances are all equal. Therefore, it is difficult to obtain a heat exchange area that functions effectively, and there is a possibility that sufficient heat exchange cannot be expected.

  The present invention has been made to cope with the above-described problems, in which a ground heat exchanger includes a soil cement wall constructed from the ground surface to the ground, and upper ends of the inflow pipe and the outflow pipe each having the above-mentioned soil. A pipe assembly embedded in the soil cement wall so as to be exposed to the outside of the cement wall is provided, and the pipe assembly is thinner than the inflow pipe and is connected to the lower end portion of the inflow pipe. A plurality of inflow tubules that are narrower than the outflow tube and are connected to the lower end portion of the outflow tube and the outflow side end portion of the inflow tubule, respectively. The medium can flow from the upper end portion of the inflow tube to the upper end portion of the outflow tube through the inflow tube, the inflow thin tubes, the outflow thin tubes, and the outflow tube.

  In the underground heat exchanger according to the present invention, a plurality of inflow tubules and a plurality of outflow tubules in the pipe assembly can be reinforced and protected by a soil cement wall. It is possible to reduce the diameter to a necessary and sufficient level, and it is possible to increase the heat exchange area obtained by each inflow tubule and each outflow tubule and to function effectively to increase the heat exchange efficiency. It is possible to improve the durability of the intermediate heat exchanger.

  Further, when carrying out the present invention, the connecting portion between the lower end portion of the inflow pipe and the inflow side end portion of each inflow thin tube has a connection portion between the connection portion with the inflow tube and each inflow thin tube. And a confluencer having a connection portion between the outflow tube and a connection portion between the outflow tubules at a communication connection portion between a lower end portion of the outflow tube and an outflow side end portion of each outflow tubule. A connecting connection portion between the outflow side end portion of each inflow thin tube and the inflow side end portion of each outflow thin tube has a connection portion between each inflow thin tube and each outflow thin tube. It is also possible that a vessel is interposed.

  In this case, using the above-described diverter, merger and coupler, the inflow pipe and the multiple inflow tubules, the outflow pipe and the multiple outflow tubules, the multiple inflow tubules and the multiple outflow tubules, respectively, It is possible to easily communicate and connect, and it is possible to easily manufacture a pipe assembly including an inflow pipe, a plurality of inflow tubules, a plurality of outflow tubules and an outflow pipe.

  In carrying out the present invention, the soil cement wall has a rectangular cross-sectional shape, and the inflow tubules and the outflow tubules of the tube assembly are arranged in a staggered manner along the longitudinal direction of the rectangle. It is also possible. In this case, it is possible to improve the heat exchange efficiency between the inflow tubules and the outflow tubules as compared to the case where the inflow tubules and the outflow tubules of the tube assembly are bundled.

  In carrying out the present invention, it is also possible to provide a drain pipe that is connected to the bottom of the pipe assembly at the lower end and exposes the upper end to the ground surface. In this case, drain (for example, dew condensation collected at the bottom of the pipe assembly or cleaning liquid after washing the pipe assembly) can be discharged from the pipe assembly through the drain pipe. Maintenance and inspection can be performed easily.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an underground heat exchanger A according to the present invention, which includes a soil cement wall 10, a pipe assembly 20, and a drain pipe 30. The soil cement wall 10 is constructed in the ground from the ground surface GL by kneading excavated soil and cement milk using a known excavator kneader, and the cross-sectional shape is shown in FIGS. As shown in FIG.

  The tube assembly 20 includes an inflow tube 21 and an outflow tube 22 as heat transfer tubes, and includes a plurality (13) of inflow tubules 23 and a plurality of (13) outflow tubules 24. The pipe assembly 20 includes a flow divider 25 for connecting the lower end portion of the inflow tube 21 and the inflow side end portion (upper end portion) of each inflow narrow tube 23, the lower end portion of the outflow tube 22, and each outflow narrow tube 24. The outflow side end portion (upper end portion) of the inflow tubule 23 and the outflow side end portion (lower end portion) of each inflow thin tube 23 and the inflow side end portion (lower end portion) of each outflow thin tube 24 are connected in communication. A connector 27 is provided.

  The inflow pipe 21 and the outflow pipe 22 are pipes having the same diameter and the same length, and are embedded in the upper part of the soil cement wall 10 so that each upper end portion is exposed to the outside of the soil cement wall 10 and exposed to the ground surface GL. Has been. As shown in FIGS. 1 and 2, each inflow narrow tube 23 is narrower than the inflow tube 21 and has a passage area of about 1/13 of the inflow tube 21, and is shown in FIGS. 4 and 5. As described above, the cross section of the soil cement wall 10 is arranged in a staggered manner along the longitudinal direction of the rectangle, and is connected to the lower end portion of the inflow pipe 21 through the flow divider 25.

  As shown in FIGS. 1 and 2, each outflow narrow tube 24 is narrower than the outflow tube 22 and has a passage area of about 1/13 of the outflow tube 22, and is shown in FIGS. 4 and 5. As described above, the cross section of the soil cement wall 10 is arranged in a staggered manner along the longitudinal direction of the rectangle, and is connected to the lower end portion of the outflow pipe 22 via the merger 26, and The outflow side end is connected in communication via a coupler 27.

  The flow divider 25 is interposed in a communication connection portion between the lower end portion of the inflow pipe 21 and the inflow side end portion of each inflow thin tube 23, and has a connection portion with the inflow tube 21 at the upper portion. And a connecting portion at the bottom. The merger 26 is interposed in a communication connection portion between the lower end portion of the outflow tube 22 and the outflow side end portion of each outflow thin tube 24, and has a connection portion with the outflow tube 22 at the upper portion. And a connecting portion at the bottom. The coupler 27 is interposed in a communication connection portion between the outflow side end of each inflow tubule 23 and the inflow side end of each outflow tubule 24, and is connected to each inflow tubule 23 and each outflow tubule 24. The connection part is provided in the upper part.

  The material of the flow divider 25, the merger 26, and the coupler 27 is preferably a heat transfer material, similar to the material of the inflow pipe 21, the outflow pipe 22, the inflow thin tube 23, and the outflow thin pipe 24 described above. In addition, each connection part (for example, connection part with the inflow tube 21 which the flow divider 25 has, and connection part with each inflow narrow tube 23) which the flow divider 25, the merger 26, and the connector 27 have is connected to the flow divider 25, the merger. It may be a mounting hole (not shown) provided in the vessel 26 and the coupler 27, or may be a connection pipe (not shown) pre-assembled in the flow divider 25, the merger 26 and the coupler 27.

  The drain pipe 30 is connected to the bottom of the pipe assembly 20, that is, the bottom of the coupler 27 at the lower end, and the upper end is exposed to the ground surface GL. Similar to the tube 22, each inflow tubule 23, each outflow tubule 24, etc., it is embedded in the soil cement wall 10. The drain pipe 30 is assembled to the integrated pipe assembly 20 before being embedded in the soil cement wall 10, and together with the pipe assembly 20 when the soil cement wall 10 is uncured. It is stood in the soil cement wall 10 and is held in the position shown in FIGS. 1 and 2 by using a cage (not shown) together with the pipe assembly 20 until the soil cement wall 10 is hardened. ing.

  In the underground heat exchanger A of the present embodiment configured as described above, from the upper end of the inflow pipe 21, the inflow pipe 21, the flow divider 25, the respective inflow thin tubes 23, the coupler 27, the respective outflow thin tubes 24, the merger 26 and the outflow pipe 22, a medium (for example, air) can flow to the upper end portion of the outflow pipe 22. By flowing the medium from the upper end portion of the inflow pipe 21 to the upper end portion of the outflow pipe 22, the flowing medium It is possible to absorb heat from the ground or release heat into the ground.

  By the way, in the underground heat exchanger A having the above-described configuration, the plurality of inflow thin tubes 23 and the plurality of outflow thin tubes 24 in the tube assembly 20 can be reinforced and protected by the soil cement wall 10. The diameters of the inflow tubules 23 and the outflow tubules 24 can be made sufficiently small, and the heat exchange areas obtained and effectively functioning in the inflow tubules 23 and the outflow tubules 24 are increased to perform heat exchange. The efficiency can be increased and the durability of the underground heat exchanger A can be improved.

  Further, in the underground heat exchanger A having the above-described configuration, a flow divider 25 is interposed to connect the lower end portion of the inflow pipe 21 and the inflow side end portions of the respective inflow thin tubes 23, and the lower end of the outflow pipe 22. Is connected to the outflow side end of each outflow thin tube 24, and the outflow side end of each inflow thin tube 23 and the inflow side end of each outflow thin tube 24 are connected in communication. A coupler 27 is interposed.

  For this reason, using the flow divider 25, the merger 26, and the connector 27, the inflow pipe 21, the plurality of inflow tubules 23, the outflow pipe 22, the plurality of outflow tubules 24, the plurality of inflow tubules 23, and the plurality The outflow thin tubes 24 can be easily connected to each other, and the tube assembly 20 including the inflow tube 21, the plurality of inflow thin tubes 23, the plurality of outflow thin tubes 24, the outflow tube 22, and the like can be easily manufactured. Is possible.

  Further, in the underground heat exchanger A having the above-described configuration, the soil cement wall 10 has a rectangular cross-sectional shape, and the inflow tubules 23 and the outflows of the tube assembly 20 extend along the longitudinal direction of the rectangle. The thin tubes 24 are arranged in a staggered manner. For this reason, it is possible to improve the heat exchange efficiency between the inflow tubules 23 and the outflow tubules 24 as compared to the case where the inflow tubules 23 and the outflow tubules 24 of the tube assembly 20 are arranged in a bundle. .

  In the underground heat exchanger A having the above-described configuration, a drain pipe 30 is provided that is connected to the bottom of the pipe assembly 20 at the lower end and exposes the upper end to the ground surface GL. For this reason, drain (for example, condensed water collected at the bottom of the pipe assembly 20 or cleaning liquid after washing the pipe assembly 20) is drained from the pipe assembly 20 through the drain pipe 30 using a drain pump or the like (not shown). The pipe assembly 20 can be easily maintained and inspected.

  In the above-described embodiment, the example in which air (gas) is used as the medium that flows from the upper end of the inflow pipe 21 to the upper end of the outflow pipe 22 has been described. However, liquid (for example, water) is used as the medium. Is also possible. In the above-described embodiment, the soil cement wall 10 has a rectangular cross-sectional shape, and the 13 inflow tubules 23 and the outflow tubules 24 of the tube assembly 20 are arranged along the longitudinal direction of the rectangle. Although an example of staggered arrangement has been described, the diameter (passage area), number, and arrangement of each inflow tubule 23 and each outflow tubule 24 can be changed as appropriate.

  When the diameters (passage areas) and the numbers of the inflow tubules 23 and the outflow tubules 24 are increased as compared with the above-described embodiment, the flow rates in the inflow tubules 23 and the outflow tubules 24 are changed to the inflow tubes 21. And the flow velocity in the outflow pipe 22 can be reduced, and the diameter (passage area) and the number of the inflow thin tubes 23 and the outflow thin tubes 24 are reduced as compared with the above embodiment. It is possible to increase the flow velocity in each inflow tubule 23 and each outflow tubule 24 as compared with the flow velocity in the inflow tube 21 and the outflow tube 22. The heat exchange efficiency can be changed.

  Further, in the above-described embodiment, the inflow pipe 21 and the plurality of inflow tubules 23, the outflow pipe 22, the plurality of outflow tubules 24, and the plurality of inflows using the flow divider 25, the merger 26, and the coupler 27. The thin tube 23 and the plurality of outflow thin tubes 24 are connected in communication. The inflow tube and the plurality of inflow thin tubes, the outflow tube and the plurality of outflow thin tubes, and the plurality of inflow thin tubes and the plurality of outflow thin tubes are connected to each other. Can be appropriately changed.

  In the above-described embodiment, the upper ends of the soil cement wall 10 in the underground heat exchanger A according to the present invention substantially coincide with the ground surface GL, and the upper ends of the inflow pipe 21 and the outflow pipe 22 are soiled. Although it implemented so that it might expose outside the cement wall 10 and may be exposed to the ground surface GL, it is also possible to implement so that the upper end of the soil cement wall 10 may be a predetermined amount below (or above) the ground surface GL. . In addition, when it implements so that the upper end of the soil cement wall 10 may be a predetermined amount below the ground surface GL, the soil cement wall 10 is buried in the ground (a part of each upper end portion of the inflow pipe 21 and the outflow pipe 22 is embedded. It can also be buried in the ground).

  Moreover, in the above-described embodiment, the underground heat exchanger A according to the present invention is provided alone, but it is also possible to provide a plurality of underground heat exchangers A according to the present invention. In the case where a plurality of underground heat exchangers A are provided, the underground heat exchangers A are connected in parallel, that is, the upper ends of the inflow pipes 21 are connected to each other and the outflow pipes 22 are connected. It is preferable that the upper ends of the two are connected in communication with each other. In this case, it is possible to ensure a large amount of medium flow.

1 is a longitudinal front view schematically showing an embodiment of a ground heat exchanger according to the present invention. It is a vertical side view of the underground heat exchanger shown in FIG. FIG. 3 is a cross-sectional plan view taken along line 3-3 in FIG. 1. FIG. 4 is a cross-sectional plan view taken along line 4-4 of FIG. FIG. 5 is a cross-sectional plan view taken along line 5-5 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Soil cement wall, 20 ... Pipe assembly, 21 ... Inflow pipe, 22 ... Outflow pipe, 23 ... Inflow tubule, 24 ... Outflow tubule, 25 ... Shunt, 26 ... Merger, 27 ... Coupler, 30 ... Drain Tube, A ... Ground heat exchanger, GL ... Ground surface

Claims (4)

  A soil cement wall constructed from the ground surface into the ground, and a pipe assembly embedded in the soil cement wall such that upper ends of the inflow pipe and the outflow pipe are exposed outside the soil cement wall, The pipe assembly has a plurality of inflow tubules that are narrower than the inflow pipe and are connected to the lower end of the inflow pipe, and are narrower than the outflow pipe and have a lower end of the outflow pipe. A plurality of outflow tubules connected to the outflow side end of the inflow tubule, respectively, through the inflow pipe, the inflow tubules, the outflow tubules and the outflow pipe from the upper end of the inflow pipe; An underground heat exchanger characterized in that a medium can flow at an upper end portion of the outflow pipe.   2. The underground heat exchanger according to claim 1, wherein a communication connection portion between a lower end portion of the inflow pipe and an inflow side end portion of each of the inflow thin tubes has a connection portion between the inflow tube and each of the inflow thin tubes. A shunt having a connecting portion is interposed, and a connecting portion between the lower end portion of the outflow tube and the outflow side end portion of each outflow thin tube is connected to the outflow tube and each outflow thin tube And a connecting portion between the outflow side end of each of the inflow tubules and the inflow side end of each of the outflow tubules is connected to the connection portion of each of the inflow tubules and each of the outflow tubules. A geothermal heat exchanger characterized in that a coupler having a connecting portion is interposed.   The underground heat exchanger according to claim 1 or 2, wherein the soil cement wall has a rectangular cross-sectional shape, and each of the inflow tubules and each of the tube assemblies along a longitudinal direction of the rectangle. An underground heat exchanger characterized in that outflow tubules are arranged in a staggered manner. The underground heat exchanger according to claim 1, 2, or 3, further comprising a drain pipe connected to the bottom of the pipe assembly at the lower end and exposing the upper end to the ground surface. Medium heat exchanger.

Images