JP2010270986A - Air conditioning device using geo-heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply outside air which has undergone heat exchange with geo-heat efficiently to two adjacent houses. <P>SOLUTION: This air conditioning device 1 using geo-heat includes: a heat exchange part 5 for interconnecting first and second main pipes 2, 3 embedded in the ground approximately horizontally and in parallel by a plurality of branch pipes 4; introduction parts 6 each having one end communicated with the main pipe 2 or 3 and the other end communicated with outside air; and supply parts 7 each having one end communicated with the main pipe 2 or 3 and the other end communicated with inside of a building. The heat exchange part 5 includes; a buffer region B where no branch pipes 4 are provided between the adjacent houses H1, H2; and first and second heat exchange regions C1, C2 located on both sides of the buffer region B. The buffer region B includes: the introduction parts 6; the first supply part 7a for supplying outside air which has undergone heat exchange in the first heat exchange region C1 to the first house H1; and the second supply part 7b for supplying outside air which has undergone heat exchange in the second heat exchange region C2 to the second house H2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air-conditioning apparatus using geothermal heat, and more particularly to an air-conditioning apparatus using geothermal heat that can efficiently supply outside air heat-exchanged by underground heat to two adjacent houses.

  In response to the recent demand for energy saving, various air conditioners using geothermal heat have been proposed (see, for example, Patent Documents 1 to 3 below). As a typical air conditioner of this type, one that supplies outside air to a building via a heat exchange pipe buried in the ground is known (such a method is called “cool tube” Also called “method”.)

  The underground temperature at a depth of about 2 to 3 m from the ground surface is stable at about 15 ° C. regardless of the season. Therefore, the air conditioner has an advantage that high temperature outside air can be cooled through a heat exchange pipe in summer, and conversely, in winter, cold outside air can be heated by the pipe and supplied into the building.

  By the way, in recent years, as shown in FIG. 11, an air conditioner has been proposed that supplies outside air heat-exchanged to a plurality of dwelling units from one heat exchanging unit U buried in the ground. For example, the heat exchanging unit U includes first and second main pipes a1 and a2 embedded in parallel with each other along the adjacent direction A of the adjacent first dwelling unit H1 and second dwelling unit H2. The first and second main pipes a1 and a2 are configured to include a plurality of branch pipes b that are orthogonally connected to the main pipe.

  Further, the first main pipe a1 has a first end for taking outside air into the heat exchanging unit U by having one end communicating with the first main pipe a1 and the other end opening on the ground. An introduction part e1 and a second introduction part e2 are provided. Similarly, at both ends of the second main pipe a2, a first supply portion f1 and a second supply portion f2 each having one end communicating with the second main pipe a2 and the other end extending inside the dwelling unit are respectively provided. Provided. Further, for example, a suction fan (not shown) is connected to the other end side of the first and second supply parts f1 and f2.

  In such a heat exchange unit U, the outside air taken in from the first introduction unit e1 is heat-exchanged by the first main pipe a1, the branch pipe b, and the second main pipe a2, and the first supply unit f1. To the inside of the first dwelling unit H1. Similarly, the outside air taken in from the second introduction part e2 is heat-exchanged by the first main pipe a1, the branch pipe b, and the second main pipe a2, and is then supplied from the second supply part f2 to the second dwelling unit H2. Supplied into the interior.

JP 2003-35456 A JP 2007-333360 A JP 2008-76015 A

  However, as a result of various experiments by the inventors, in the structure of the conventional heat exchange unit U, the air conditioner is stopped (for example, the suction from the first supply unit f1 is stopped) in one of the dwelling units, for example, the first dwelling unit H1. When the first introduction e1 is closed), it has been found that almost no air flows through the branch pipe b arranged on the first dwelling unit H1 side, resulting in a large variation in flow rate. For this reason, the branch pipe b having a small air flow rate has a problem that condensation is likely to occur inside, and mold is generated at an early stage, and there is a possibility that a strange odor is generated in the heat-exchanged air.

  The present invention has been devised in view of the above-described problems, and reduces the variation in the air flow rate flowing through each branch pipe of the heat exchange section, effectively reducing the heat exchange performance and condensation in the branch pipe. The main purpose is to provide an air-conditioning system using geothermal heat that can be prevented.

  The invention according to claim 1 of the present invention is a plurality of branch pipes in which the first main pipe and the second main pipe embedded in the ground substantially horizontally and parallel to each other extend perpendicularly to the main pipe. A connected heat exchanging portion, an introduction portion with one end communicating with the first main pipe and the other end communicating with the outside air, one end communicating with the second main pipe and the other end communicating with the interior of the building. An air conditioner using geothermal heat that exchanges heat with the heat exchange unit and supplies the outside air taken in from the introduction unit to the interior of the dwelling unit via the supply unit, and the heat exchange unit includes: The first main pipe and the second main pipe extend along the adjacent direction of the adjacent first dwelling unit and the second dwelling unit, and the branch pipe is not provided between the adjacent dwelling units. A first heat exchange in which a plurality of branch pipes are arranged on the buffer area and the first dwelling unit side And a second heat exchange region in which a plurality of branch pipes are arranged on the second dwelling side of the buffer region, and the buffer region includes at least one introduction section and the first heat exchange. A first supply unit that supplies outside air heat-exchanged in the region to the first dwelling unit, and a second supply unit that supplies outside air heat-exchanged in the second heat exchange region to the second dwelling unit And is provided.

  The invention according to claim 2 is the geothermal heat utilization air conditioner according to claim 1, wherein both ends of the first main pipe and the second main pipe are closed.

  According to a third aspect of the present invention, the introduction unit includes: a first introduction unit that takes outside air into the first heat exchange region; and a second introduction unit that takes outside air into the second heat exchange region. It is an air conditioner using geothermal heat according to claim 1 or 2.

  In the air conditioner using geothermal heat of the present invention, the heat exchanging unit includes a buffer region in which the branch pipe is not provided between adjacent dwelling units, and a plurality of branch pipes arranged on the first dwelling unit side. 1 heat exchange area and a second heat exchange area in which a plurality of branch pipes are arranged on the second dwelling unit side of the buffer area. The buffer area includes at least one outside air introduction section, a first supply section that supplies the outside air heat-exchanged in the first heat exchange area to the first dwelling unit, and a second heat exchange area. And a second supply unit that supplies the heat exchanged outside air to the second dwelling unit. In such a heat exchange unit, even when one dwelling unit stops using the air conditioner, the variation in the air flow rate flowing through each branch pipe of the heat exchange unit is significantly smaller than in the past, and the heat exchange performance Is effectively prevented from occurring and condensation in the branch pipe.

It is a top view of the air-conditioner which shows embodiment of this invention. It is sectional drawing of FIG. It is a detailed top view of the heat exchange part of this embodiment. It is sectional drawing which shows the connection part of the main pipe and branch pipe of this embodiment. It is sectional drawing which shows the connection part of the main pipe and branch pipe of other embodiment. It is a top view which shows other embodiment of this invention. It is a top view explaining the heat exchange part (two-door operation state) of a comparative example. It is a top view explaining the heat exchanging part (only one house is in operation state) of a comparative example. It is a top view explaining the heat exchange part (two-door operation state) of an Example. It is a top view explaining the heat exchange part (only one house is driving | running state) of an Example. It is a plane schematic diagram of the conventional heat exchange part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of an air conditioner 1 using geothermal heat according to the present invention. The air conditioner 1 includes two adjacent dwelling units, that is, both a first dwelling unit H1 and a second dwelling unit H2. Shows what can supply air heat-exchanged with underground heat.

  The air conditioner 1 of the present embodiment includes first and second main pipes 2 and 3 embedded in the ground parallel to each other along the adjacent direction A of the adjacent first dwelling unit H1 and second dwelling unit H2. The heat exchanger 5 includes a plurality of branch pipes 4 that connect the first and second main pipes 2 and 3 perpendicularly to the main pipe, and the heat exchange section 5 is configured in a ladder shape in plan view. In addition, the heat exchange unit 5 can supply the introduction unit 6 that can introduce outside air into the heat exchange unit 5 and the outside air heat-exchanged by the heat exchange unit 5 to the inside of the respective dwelling units H1 and H2. And a supply unit 7.

  The heat exchanging unit 5 is provided adjacent to the dwelling units H1 and H2. In this embodiment, the heat exchanging unit 5 is embedded in the ground G of the garden Y provided on the front side of each dwelling unit.

  The first main pipe 2, the second main pipe 3 and the branch pipe 4 are buried in the ground where the temperature is almost constant regardless of the season, for example, the ground G having a depth of about 2 to 3 m from the ground surface. Is desirable. In the present embodiment, each of the main pipes 2 and 3 and the branch pipe 4 is a pipe having a circular cross section. The pipes 2, 3 and 4 can be made of various materials, and in view of moldability, durability, rust prevention and thermal conductivity, non-metallic materials, especially resins such as hard vinyl chloride resins. It is desirable to be formed of a material.

  In this embodiment, the 1st main pipe 2 and the 2nd main pipe 3 are embed | buried in parallel mutually with the substantially horizontal and the same depth. Since it is “substantially horizontal”, the main pipes 2 and 3 do not have to be buried exactly horizontally. In the present embodiment, the main pipes are configured such that the condensed water generated on the inner surfaces of the main pipes 2 and 3 is collected in drain pipes 9 (shown in FIG. 2) provided at both ends of the main pipes 2 and 3. 2 and 3 are each provided with a gradient of about 3 to 10 degrees. The main pipes 2 and 3 of the present embodiment are each provided with a substantially inverted V-shaped gradient that descends outward in FIG. 1, but it goes without saying that it may be a unidirectional gradient. In addition, a pump or the like (not shown) is inserted into the drain pipe 9 from the ground surface side, and condensed water is sucked up appropriately.

  FIG. 3 shows a detailed enlarged plan view of the heat exchanging section 5, and FIG. 4 shows an enlarged cross-sectional view of a portion X in FIG. Each of the main pipes 2 and 3 of the present embodiment includes a first portion 20 having a pipe shape, and is connected to the first portion 20 and extends in the axial direction. The branch pipe 4 extends in the middle at a right angle to the axial direction. The second portions 22 having the branch portions 22c to be connected are alternately connected in the axial direction. In such main pipes 2 and 3, the connection position between the main pipes 2 to 3 and the branch pipe 4 can be freely set by changing the axial length of the first portion 20. Therefore, the versatility of the heat exchanging unit 5 is improved, and it is useful for keeping the manufacturing cost low. Note that both end portions of the first and second main pipes 2 and 3 are respectively closed by caps 15.

  The first portion 20 is configured, for example, as a simple pipe extending with a substantially constant inner diameter d1.

  In addition, as shown in FIG. 4, the second portion 22 includes a main portion 22a extending in the axial direction with an inner diameter equal to the inner diameter d1 of the first portion 20, and the first portion 20 that is provided at both ends thereof. And an enlarged diameter portion 22b that can be inserted into the housing. Thereby, the main pipes 2 and 3 extend in the axial direction substantially continuously with the inner diameter d1.

  The second portion 22 has, for example, the branch portion 22c protruding at a substantially middle portion in the axial direction. The branch part 22c has an inner diameter d2 substantially equal to the branch pipe 4 to be connected, and a diameter-enlarged part 22d into which the branch pipe 4 can be inserted densely is provided at the tip of the branch part 22c. Thus, the inner diameter d2 is continuous between the branch pipe 4 and the branch portion 22c. In addition, the inner diameter of the branching portion 22c does not gradually change from the connecting portion with the main pipe 2, and in this embodiment, the branching portion 22c is branched with a sudden decrease in the cross-sectional area.

  The ratio (d2 / d1) between the inner diameter d2 of the branch pipe 4 and the inner diameters d1 of the main pipes 2 and 3 is set in the range of, for example, 0.15 to 0.45, more preferably 0.20 to 0.40. Preferably it is done. As described above, when the inner diameter d2 of the branch pipe 4 is significantly reduced as compared with the inner diameter d1 of each of the main pipes 2 and 3, the variation in the air flow rate flowing through each branch pipe 4 of the heat exchange unit 5 is reduced. As a result, heat can be efficiently exchanged between the branch pipes 4. The inner diameter d1 of each of the main pipes 2 and 3 is desirably set to, for example, about 100 to 300 mm, more preferably about 100 to 150 mm.

  In the embodiment of FIG. 4, the branch portion 22 c of the second portion 22 is connected to the main pipe 2 at a right angle and straight. However, the branch portion 22c can be curved in an arc shape as shown in FIG. Needless to say, such a branching portion 22c is bent in such a direction that the resistance at the time of the branching of the air is reduced when the air flow of the main pipe 2 is indicated by N, for example.

  Each of the branch pipes 4 extends straight and connects the first main pipe 2 and the second main pipe 3 via the branch portion 22c.

  Further, the heat exchanging unit 5 includes a buffer region B in which the branch pipe 4 is not provided in a certain section between the first dwelling unit H1 and the second dwelling unit H2, and a branch pipe on the first dwelling unit H1 side. 4 includes a first heat exchange region C1 in which a plurality of branch pipes 4 are arranged, and a second heat exchange region C2 in which a plurality of branch pipes 4 are arranged on the second dwelling unit H2 side of the buffer region B.

  In the present embodiment, the branch pipes 4 are provided at a constant arrangement pitch P (shown in FIG. 3) in the first and second heat exchange regions C1 and C2. Moreover, each branch pipe 4 and the main pipes 2 and 3 are connected so that the heights of their centerlines are aligned as shown in FIG. In order to make the flow velocity of the branch pipe 4 uniform, the arrangement pitch P of the branch pipe 4 is preferably set in the range of 450 to 1800 mm.

  On the other hand, the buffer area B is an area where the branch pipe 4 is not provided between the first main pipe 2 and the second main pipe 3, which is located substantially in the middle of the heat exchange section 5. More specifically, the branch pipe 4 is not provided in a range larger than the arrangement pitch P. In other words, as shown in FIG. 3, in the buffer area B, the arrangement pitch Pb of the branch pipes 4 is the arrangement pitch of the branch pipes 4 in the first heat exchange area C1 and the second heat exchange area C2. It can be said that the portion is formed larger than P. Although not particularly limited, the arrangement pitch Pb of the branch pipes 4 on both sides of the buffer area B is equal to the arrangement pitch P of the branch pipes 4 in the second heat exchange area C1 and the second heat exchange area C2. 1.5 times or more, more preferably 3 times or more is desirable, and preferably 6 times or less, more preferably 4 times or less.

  And in the buffer area | region B, the 1st supply part 7a which supplies the 1st dwelling unit H1 with the at least 1 said introduction part 6, the external air heat-exchanged in the 1st heat exchange area | region C1, and 2nd There is provided a second supply unit 7b that supplies the outside air heat-exchanged in the heat exchange region C2 to the second dwelling unit H2.

  The introduction unit 6 of the present embodiment includes a first introduction unit 6a that takes outside air into the first heat exchange region C1, and a second introduction unit 6b that takes outside air into the second heat exchange region C2. . As shown in FIG. 2, each of the introduction portions 6 a and 6 b has a pipe shape extending up and down, and its lower end is buried in the underground G and communicated with the first main pipe 2. The upper ends of the introduction portions 6a and 6b are exposed to the ground and curved downward by about 180 degrees and open downward. Such a downward opening can prevent rainwater or the like from entering. In addition, for example, a filter or the like is disposed in the opening. This is useful for preventing insects and foreign substances from entering the introduction portion 6.

  The introduction portions 6a and 6b are provided at a small distance from each other in the first main pipe 2 of the buffer region B. The first introduction part 6a is provided on the first dwelling unit H1 side of the buffer area B, and the second introduction part 6b is provided on the second dwelling unit H2 side of the buffer area B.

  Each of the supply portions 7a and 7b has a pipe shape, and a lower end thereof is buried in the ground G and connected to and communicates with the second main pipe 3 of the buffer region B. Moreover, while the 1st supply part 7a extends in the underground G toward the 1st dwelling unit H1, the upper end is opened by the underfloor space 11a of the 1st dwelling unit H1. Similarly, the 2nd supply part 7b extends in the underground G toward the 2nd dwelling unit H2, and the upper end is opened in the underfloor space 11b of the 2nd dwelling unit H2.

  In addition, in each of the underfloor spaces 11a and 11b, for example, an intake fan 10 that forcibly sucks air from the heat exchange unit 5 is connected to the openings of the supply units 7a and 7b. In the present embodiment, the underfloor spaces 11a and 11b of the dwelling units H1 and H2 are spaces surrounded by the foundation and insulated from the outside air, and the air in the underfloor space is obtained from the openings O1 or O2 provided in the floor portion. It is supplied to the interior of the living room, and is supplied to each part through the air flow path in the house, as shown by an example of the air flow in the arrow.

  In the present embodiment, the branch pipes 4 in the first and second heat exchange regions C1 and C2 are laid out substantially symmetrically in plan view, and the introduction part 6 and the supply part 7 are also symmetrical. Is arranged. However, the present invention is not limited to such an embodiment.

  The operation of the air conditioner 1 configured as described above will be described. In both the first dwelling unit H1 and the second dwelling unit H2, when the intake fan 10 is driven, the outside air is taken into the buffer region B via the introduction parts 6a and 6b. The outside air taken into the buffer region B branches right and left into the first heat exchange region C1 and the second heat exchange region C2, and is in the direction indicated by the arrows in FIG. 3 (that is, the first main pipe). 2 and the second main pipe 3 in opposite directions) from the first supply section 7a and the second supply section 7b, respectively, the underfloor space 11a of the first dwelling unit H1 and the underfloor space of the second dwelling unit H2. 11b.

  In addition, when the air conditioner 1 is not used in one of the dwelling units, for example, the first dwelling unit H1, the intake fan 10 may be stopped and the opening on the ground side of the first introduction unit 6a may be blocked. is there. Even in such a case, in the air conditioner 1 of the present embodiment, the second introduction unit 6b and the second supply unit 7b are buffers between the first heat exchange region C1 and the second heat exchange region C2. Since it is provided in the region B, both the heat exchange regions C1 and C2 can be used in a balanced manner. That is, when only the intake fan 10 of the second dwelling unit H2 is in operation, the outside air taken into the buffer region B from the second introduction part 6b is converted into the first heat exchange region C1 and the second It is possible to supply the outside air branched into the right and left heat exchange area C2 from the second supply section 7b to the underfloor space 11b of the second dwelling unit H2.

  Thus, in the air conditioner 1 of the present embodiment, even when a single house stops using the geothermal air conditioner, compared to the case where air is drawn from one side as shown in FIG. The variation in the air flow rate flowing through each branch pipe 4 of the heat exchanging unit 5 is reduced, and as a result, heat is efficiently exchanged in each branch pipe 4. Therefore, since air flows uniformly through each branch pipe 4, it is possible to suppress the occurrence of condensation on the inner surface of the branch pipe 4, and thus effectively suppress the generation of mold and off-flavors over a long period of time.

  In the above embodiment, the introduction unit 6 is composed of the first introduction unit 6a and the second introduction unit 6b. However, the introduction part 6 may be only one provided in the middle part of the buffer area B, for example. Moreover, in embodiment of FIGS. 1-3, although what is called two adjacent dwelling units is object, as shown in FIG. 6, for example, the air conditioner 1 of this embodiment is object for even or more than four houses. It can also be installed. In this case, the air conditioner 1 can be provided in the above-described manner with two dwelling units H1-H2 and two dwelling units H3-H4 adjacent to each other as one set.

  In order to clarify the effects of the present invention, experiments conducted by the present inventors will be described below. 7 to 10 show layouts in plan view of the heat exchange unit 5 used in this experiment. The reference numerals correspond to those of the above-described embodiment.

[Comparative device]
In FIG. 7, as a comparative example, air is sucked in (IN) from the introduction portions 6a and 6b at both ends of the first main pipe 2, and air is discharged from the supply portions 7a and 7b at both ends of the second main pipe 3. (OUT). That is, in the comparative example of FIG. 7, the buffer region B is not provided with the introduction unit and the supply unit, and the air conditioner is operated in two dwelling units. In addition, the number of branch pipes 4 was set to three for each of the first and second heat exchange regions C1 and C2 for experimental purposes. FIG. 8 shows a state where the operation of the air conditioner is stopped in the first dwelling unit and the air conditioner is used only in the second dwelling unit. That is, the first introduction part 6 a and the second supply part 7 b are both closed with the cap 15. Moreover, the flow of air is shown with a broken line.

[Device of Example]
In FIG. 9, as an embodiment, air is sucked (IN) from the introduction portions 6 a and 6 b provided in the first main pipe 2 in the buffer area B and provided in the second main pipe 3 in the buffer area B. The air was discharged (OUT) from the supply sections 7a and 7b. That is, in the Example of FIG. 9, the air conditioner is operated by two dwelling units. FIG. 10 shows a state where the operation of the air conditioner is stopped in the first dwelling unit and the air conditioner is used only in the second dwelling unit in the embodiment. That is, both the second introduction part 6 b and the second supply part 7 b are closed by the cap 15.

Further, the air is forcibly exhausted from the (OUT) side of the supply unit 7a and / or 7b by a blower fan (not shown), and the air volume on the supply side (IN) is adjusted to be 50 m ³ / h. Went. The fan voltage (which is a function of the fan speed) and the wind speed (proportional to the air volume) flowing through each branch pipe 4 (referred to as branch pipes 4a to 4f sequentially from the right in the figure) were measured.

  Each of the pipes 2, 3, and 4 is made of a hard vinyl chloride resin. Other main dimensions are as follows.

Total length of the first and second main pipes L1: 3200 mm
Distance between the axes of the first and second main pipes L2: 1200 mm
Distance L3 from the other end of the first and second main pipes to the branch pipe: 1000 mm
Distance L4 from one end of the first and second main pipes to the branch pipe: 1000 mm
Branch pipe arrangement pitch P: 300 mm (constant)
Buffer area B length L5: 1000 mm
Distance L6 between branch pipe and introduction part (or supply part): 300mm
The test results are shown in Table 1.

  As a result of the test, it was confirmed that in the example, the variation in the wind speed was significantly reduced while increasing the average flow velocity of each branch pipe as compared with the comparative example. In particular, in the examples, it was also confirmed that the average wind speed of the branch pipe was improved. In addition, although another experiment was performed by changing the inner diameter and the number of the branch pipes 4, it was confirmed that any of the effects of the present invention was achieved.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 1st main pipe 3 2nd main pipe 4 Branch pipe 5 Heat exchange part 6 Introduction part 6a 1st introduction part 6b 2nd introduction part 7 Supply part 7a 1st supply part 7b 2nd Supply section A Adjacent direction B of the dwelling unit Buffer area C1 First heat exchange area C2 Second heat exchange area G Underground

Claims (3)

A heat exchange section in which a first main pipe and a second main pipe embedded in the ground substantially horizontally and parallel to each other are connected by a plurality of branch pipes extending perpendicularly to the main pipe;
An introduction portion having one end communicating with the first main pipe and the other end communicating with outside air;
A supply portion having one end communicating with the second main pipe and the other end communicating with the interior of the building,
It is an air conditioner using geothermal heat that exchanges heat with the outside air taken in from the introduction part and supplies it to the inside of the dwelling unit through the supply part,
The heat exchange part is
The first main pipe and the second main pipe extend along the adjoining direction of the adjacent first dwelling unit and second dwelling unit; and
A buffer area where the branch pipe is not provided between the adjacent dwelling units, a first heat exchange area where a plurality of branch pipes are arranged on the first dwelling unit side, and a second dwelling side of the buffer area And a second heat exchange region in which a plurality of branch pipes are arranged, and at least one of the introduction section and the outside air heat-exchanged in the first heat exchange region in the buffer region. The underground characterized in that a first supply unit for supplying to the dwelling unit and a second supply unit for supplying outside air heat-exchanged in the second heat exchange region to the second dwelling unit are provided. Heat-utilizing air conditioner.   The air conditioner using geothermal heat according to claim 1, wherein both ends of the first main pipe and the second main pipe are closed.   The ground according to claim 1 or 2, wherein the introduction unit includes a first introduction unit that takes outside air into the first heat exchange region, and a second introduction unit that takes outside air into the second heat exchange region. An air conditioner using medium heat.

Images