JP2006071134A - Pile type heat exchanging device and heat storage system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile type heat exchanging device filled with latent heat storage material for improving heat exchanging efficiency and heat storage efficiency, and to provide a heat storage system using the same in combination with a heat exchanger pipe for a solar collector for maintaining a good heat energy giving-receiving balance throughout the year. <P>SOLUTION: The pile type heat exchanging device 5 utilizes underground heat in the state that a heat exchanger pipe body 2 is arranged in a hollow portion of a pile 1 embedded in the ground of a predetermined depth for circulating and distributing heat medium and the latent heat storage material 3 filled in the hollow portion of the pile 1. The heat storage system uses the same in the state that heat medium circulating and distributing part of the solar collector 10 utilizing solar heat is inserted and embedded as a heat exchange portion 22 into the latent heat storage material 3 filled in the pile type heat exchanging device 5 and combined therewith to form an integrated heat storage region F including the pile type heat exchanging device 5 embedded in the ground and surrounding soil. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pile-type heat exchange device that uses geothermal heat with little temperature change throughout the year and a heat storage system using the pile-type heat exchange device.

  In recent years, geothermal energy utilization systems such as building air-conditioning facilities and snow-melting facilities using geothermal heat have attracted attention.

  In the geothermal heat utilization system, there is known a method of using a foundation pile to be used as a place for heat exchange when constructing a building. In the system using this foundation pile, a new heat exchange well is required. Therefore, the site and construction costs can be reduced and the construction period can be shortened. There are a method using a concrete foundation pile, a method using a steel pipe foundation pile, and a cast-in-place pile method. For example, in the case of a concrete foundation pile or a steel pipe foundation pile, a U-shaped tube (U tube) is inserted inside, and the heat medium Is a system that circulates in the U-tube and absorbs (releases) underground heat for use.

In addition, as a steel tube pile for heat exchange that can transmit the underground heat more efficiently to the inside of the pile and has excellent workability, the blade has an outer shape 1.5 to 3 times the outer diameter of the pile body. A steel pipe pile with one or more turns of a spiral wing for screwing a pile projecting on the outer peripheral surface of the pile body and having at least a drilling claw at the lower end of the pile, and having a heat exchange pipe inside the pile hollow Has been disclosed (for example, see Patent Document 1).
Japanese Patent Application Laid-Open No. 2004-177012

  However, in the conventional example according to the above-mentioned Patent Document 1, there is no idea as a heat storage material, and the filler filled in the space portion of the pile constituting the heat exchange device is described only as a filler, Furthermore, there is no description about the combination technology with the solar heat utilization system, and there remains a problem.

  The present invention has been made in view of the above-described situation. A pile-type heat exchange device in which a heat exchange part is arranged in a hollow part of a pile and the heat exchange efficiency and the heat storage efficiency are increased by filling a latent heat storage material. This pile-type heat exchange device is embedded at a predetermined depth in the ground and combined with the heat exchanging part of the solar collector to increase the overall thermal efficiency and maintain a good balance of heat energy exchange throughout the year. An object of the present invention is to provide a simple pile-type heat exchange device and a heat storage system using the pile-type heat exchange device.

  This invention can solve the said subject by providing the following structure.

  (1) A heat exchanging tubular body that circulates and circulates a heat medium is arranged in a hollow portion of a pile buried in the ground at a predetermined depth, and a latent heat storage material is filled in the hollow portion of the pile to use ground heat. Pile-type heat exchange device.

  (2) A portion of the piping that circulates and circulates the heat medium of the solar collector using solar heat is inserted and embedded in the latent heat storage material filled in the pile described in (1) above, and embedded in the ground. A heat storage system using a pile-type heat exchange device that forms an integrated heat storage region including the pile and surrounding soil.

  The present invention provides a pile-type heat exchange device in which a heat exchange part is arranged in a hollow part of a pile and the latent heat storage material is filled to increase heat exchange efficiency and heat storage efficiency. A pile-type heat exchange device that is buried at a predetermined depth in the ground, combined with the heat exchange part of the solar collector, increases the overall thermal efficiency, and can maintain a good balance of thermal energy throughout the year, and the pile-type heat exchange A heat storage system using the device can be provided.

  Hereinafter, embodiments of a pile type heat exchange device according to the present invention and a heat storage system using the pile type heat exchange device will be described.

  FIG. 1 is a cross-sectional view of a main part of a pile-type heat exchange device according to the present invention, and FIG. 2 shows an example in which a solar collector is incorporated in a heat storage system using the pile-type heat exchange device according to the present invention. It is a typical whole block diagram.

  A predetermined depth H is set to 1 to 3 m from the ground surface E, for example, and a pile 1 (steel pipe pile) having an outer diameter D of approximately 150 to 200 mm and a length of 6 to 7 m is buried in the ground. For example, a heat exchange section composed of a heat exchange tubular body (pipe) 2 wound in a spiral shape for circulating a heat medium such as water or an antifreeze liquid is arranged, A latent heat storage material 3 encapsulating the latent heat storage material of the system is filled to form a pile-type heat exchange device 5 using underground heat.

  Connection portions 6 a and 7 a for connecting the delivery pipe 6 and the return pipe 7 through the load equipment 8 and the pump 9 are provided on the upper part of the spirally wound heat exchange tubular body (pipe) 2. . In addition, the existing steel pipe pile used for a foundation pile can be used for a pile.

  Examples of the heat medium for carrying heat include water, antifreeze liquid whose concentration is adjusted in consideration of local environmental characteristics, and medium such as oil having low viscosity and good fluidity.

  The latent heat storage material 3 is a latent heat storage material in which, for example, an organic latent heat storage material is housed in a capsule made of a synthetic resin that has high heat resistance and is strong, and the size of the capsule can be freely selected, for example, 50 μm or less and 1 μm. Atomization is possible to the extent. However, the size of the capsule is not limited.

  The capsule capsule made of resin is excellent in heat resistance and durability, the heat storage material in the capsule can be freely selected at a melting point of 70 ° C or less, and the heat storage material repeatedly melts and solidifies in the capsule to store latent heat. And heat dissipation.

  For example, the latent heat storage material 3 can be dispersed and liquefied in an antifreeze solution (concentration adjusted) containing a rust preventive agent, and filled into a hollow portion of a steel pipe pile.

  Note that Icenon (registered trademark) can also be used as the latent heat storage material.

  The tip portion of the pile-type heat exchange device 5 has a conical shape 5a, and has a blade shape formed by crushing and twisting the tip of the pipe on both sides of the conical shape 5a at the tip, and a drilling blade 5b having a similar shape to the drill tip. It has a shape that is easy to embed by excavating while rotating when buried in the ground.

  5c is a cap part, and in order to prevent that a foreign material mixes in the pile-type heat exchange apparatus 5, it is fitted and used for the top part of a pile.

  The thickness and length of the pile can be appropriately determined according to installation conditions, regional characteristics, and scale.

  In Example 2, a part of a pipe for circulating the heat medium of the solar collector 10 using solar heat was inserted and buried in the latent heat storage material 3 filled in the pile 1 as a heat exchanging portion 22 and buried in the ground. An integral heat storage region F is configured including the pile 1 and the surrounding soil.

  That is, for example, a primary-side delivery pipe 11 for delivering a heat medium of a solar collector 10 using solar heat S into a latent heat storage material 3 filled in a hollow portion of a pile 1 constituting a pile-type heat exchange device 5 using geothermal heat. A heat exchange section (in this case, a U-shaped pipe) 22 that forms a middle pipe portion of the secondary return pipes 12a, 12b after heat exchange with the load equipment 13 (in this case, hot water supply equipment) Furthermore, the pile-type heat exchange device 5 buried in the ground and the heat storage capacity of the surrounding soil are added, and an integrated heat storage region F is configured including this soil.

  The hot water supply facility forming the load facility 13 includes a water supply unit 15 and a hot water supply unit 16, and is connected to the heat medium and the heat exchange unit 14 that are sent from the delivery pipe connection part 10 a of the solar collector 10 through the primary delivery pipe 11. Heat is exchanged, and the temperature of the water supply is raised to supply hot water. At this time, the heat medium after the heat exchange is returned to the solar collector 10 via the pump 19 via the heat exchange part that forms the intermediate pipe part 22 of the secondary return pipes 12a and 12b via the return pipe connection part 10b. .

  The hot water supply equipment is provided with a bypass circuit (pipe) for supplying the heat medium supplied from the solar collector directly to the pile-type heat exchange device via the switching valve and pump when the hot water supply temperature reaches a predetermined temperature. It is.

  That is, when the hot water supply temperature reaches, for example, 45 ° C., by setting the control means 20 so as to bypass the heat medium, the excess heat medium passes through the bypass pipe 21 and the U of the pile-type heat exchange device 5. Heat is stored in the latent heat storage material 3 at the heat exchanging part 22 forming the character pipe and returns to the solar collector 10 from the return pipe connecting part 10b via the return pipe 12b.

  When the hot water supply temperature reaches a predetermined temperature, for example, 45 ° C. and is switched to the bypass pipe, the normal flow in the order of arrows A, B, C, D, E, F is the first switching valve (three-way valve) 17 and the first flow. By the switching operation of the 2-switch valve (3-way valve) 18, the flow of the heat medium is switched to the flow path via the bypass pipes A, G, D, E, F. The operation in the summer when the outside air temperature is high shows the above-described mode. When the outside air temperature is low or the weather is not good, the heat stored in the pile heat exchanger 5 and the heat storage region F is used as, for example, the load facility 8. The heat exchange unit 22 that forms a U-shaped tube serves as a preheating unit for the solar collector 10 that uses solar heat, and is used for heating equipment such as hot water supply facilities. It will function as a heating medium for heating. Reference numeral 9 denotes a heat medium circulation pump.

  The heat exchanging part 22 forming the U-shaped tube may have a coil shape wound spirally.

  In addition, according to the magnitude | size of a scale and environmental conditions, the number of the pile-type heat exchange apparatuses 5 can select two or more pieces suitably.

  In addition, in order to distinguish the heat storage region F around the integral heat storage region F including the pile type heat exchange device 5 and surrounding soil, for example, an appropriate distance is placed around the pile type heat exchange device 5. It may be surrounded by a concrete wall. By carrying out like this, it can prevent that heat is radiated in the surrounding soil from the thermal storage area | region F heated up from the surrounding soil temperature, and can improve thermal storage efficiency.

  That is, the present invention provides a heat efficient pile-type heat exchange device filled with a latent heat storage material, and also provides a heat storage system that efficiently stores heat by combining underground heat and solar heat. The medium is sent to a hot water supply facility to exchange heat, and the heat medium after the heat exchange is sent to the heat exchange section forming the U-shaped tube of the pile-type heat exchange device via a pump to exchange heat. The heat medium after heat exchange is returned to the solar collector to form a solar heat circulation closed circuit, while a heating panel such as a floor heating panel and a pile-type heat exchange device buried in the ground are connected via a pump. A pile-type heat exchanger that forms a closed circuit for underground heat circulation and can maintain a good balance of heat transfer throughout the year by offsetting a period of high heat storage in summer and a period of high heat utilization in winter A heat storage system can be provided.

  Furthermore, when the pile-type heat exchange device according to the present invention is also used as a foundation pile of a building, it is necessary to use the pile-type heat exchange device main body part under the condition that the main part of the pile-type heat exchange device is buried in the ground by 1 to 3 m and is not affected by the outside temperature. In addition, it is desirable to use foundation piles along the outer wall of the building in consideration of maintenance.

Main part structure sectional drawing of the pile type heat exchange apparatus which concerns on this invention Schematic general configuration diagram showing an example when a solar collector is incorporated in a heat storage system using a pile heat exchanger according to the present invention

Explanation of symbols

1 Pile (pile body)
2 Tubular body for heat exchange (pipe)
3 Latent heat storage material 5 Pile type heat exchange device 5a Conical shape 5b Excavation blade 5c Cap parts 6, 11 Delivery pipe (primary side delivery pipe)
7, 12a, 12b Return piping (secondary return piping)
8. Load equipment (heating panel)
9, 19 Pump 10 Solar collector 10a Sending pipe connection 10b Return piping connection 13 Load equipment (hot water supply equipment)
14 Heat exchange part 15 Water supply part 16 Hot water supply part 17 1st switching valve (3-way valve)
18 Second switching valve (3-way valve)
20 Control means 21 Bypass piping (bypass circuit)
22 heat exchange part E ground surface F heat storage area S solar heat

Claims (2)

  A heat exchanging tubular body for circulating and circulating a heat medium is arranged in a hollow portion of a pile buried in the ground at a predetermined depth, and a latent heat storage material is filled in the hollow portion of the pile to use ground heat. Pile-type heat exchange device.   A pile of pipes that circulate and circulate the heat medium of a solar collector using solar heat in the latent heat storage material filled in the hollow part of the pile according to claim 1 as a heat exchange part, and the pile embedded in the ground A heat storage system using a pile-type heat exchange device, characterized in that an integrated heat storage region including the surrounding soil is constructed.

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