JP2005241145A - Heat exchanger and solid phase separating method for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing the impairing of heat transfer property caused by the attachment of a solid phase of a heat storage substance to a surface of a heat transfer face. <P>SOLUTION: This heat exchanger comprises a medium A capable of changing its phase from liquid phase to solid phase or from solid phase to liquid phase, a medium B for exchanging the heat with the medium A, and the heat transfer face 2c (outer peripheral face of collapsible tube 2) mounted between the medium A and the medium B and kept into contact with the medium A. Whereby the heat transfer face 2c can be deformed to separate the solid phase of the medium A attached to the heat transfer face 2c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchange device that performs heat exchange between a medium A and a medium B, and in particular, a heat exchange device that uses a heat storage material that changes phase from a liquid phase to a solid phase or from a solid phase to a liquid phase as the medium A, and The present invention relates to a solid phase peeling method of a heat exchange device.

  A latent heat regenerator is known as a heat exchange device using latent heat generated when a heat storage material undergoes phase change. The latent heat accumulator is composed of a heat storage material that can change from a liquid phase to a solid phase or from a solid phase to a liquid phase according to temperature, a heat exchange unit that has a heat transfer surface in contact with the heat storage material, and an interior of the heat exchange unit. And a medium for performing heat exchange with the heat storage material.

  In the case of heat storage with a high melting point, in the latent heat accumulator, a medium having a temperature higher than the melting point of the heat storage material is flowed into the heat exchange part, and heat is transferred from the medium to the heat storage material through the heat transfer surface, thereby the heat storage material. Is changed from a solid phase to a liquid phase. On the other hand, in the case of heat dissipation, a medium having a temperature lower than the melting point of the heat storage material is allowed to flow into the heat exchanging part, and heat is transferred from the heat storage material to the medium through the heat transfer surface, thereby transferring the heat storage material from the liquid phase to the solid phase. Change the phase.

  However, particularly in the case of heat dissipation, the heat storage material in the portion in contact with the heat transfer surface is cooled, so that the solid phase of the heat storage material adheres to the heat transfer surface. Since this solid phase generally has a lower thermal conductivity than the liquid phase, it acts like a heat insulator, resulting in poor heat transfer from the heat storage material to the medium, making it difficult to extract heat. Has occurred.

  In order to eliminate such poor thermal responsiveness, it has been performed to meander the heat medium flow path or to increase the area of the heat transfer surface by providing fins on the iron pipe as the heat exchange part ( For example, see Patent Document 1 and FIG.

JP 2003-240465 A

  However, in the technique of providing fins on the iron pipe, not only the volume of the heat storage tank in which the heat storage material is stored is reduced, but also the solid phase of the heat storage material is attached to the fins. This technique cannot solve the fundamental problem that the solid phase of the heat storage material adheres to the heat transfer surface, resulting in poor heat transfer.

  Then, an object of this invention is to provide the heat exchange apparatus which can prevent that the solid phase of a thermal storage substance adheres to the surface of a heat-transfer surface, and heat transfer property worsens.

  In order to solve the above-described problems, the present invention is configured to peel the solid phase adhering to the heat transfer surface by deforming the heat transfer surface, thereby improving the heat transfer performance of the heat exchange device.

  Specifically, the invention described in claim 1 includes a medium A that can change phase from a liquid phase to a solid phase or from a solid phase to a liquid phase, a medium B that exchanges heat with the medium A, and the medium A. A heat transfer surface provided between the medium B, and the heat transfer surface can be deformed so that the solid phase of the medium A attached to the heat transfer surface can be peeled off. The above-described problems are solved.

  According to a second aspect of the present invention, in the heat exchange device according to the first aspect, the heat transfer surface is an outer peripheral surface of a tube through which the medium B flows, and the medium B passes through the inside of the tube. The tube is deformed by flowing.

  The invention according to claim 3 is a medium A that can change phase from a liquid phase to a solid phase or from a solid phase to a liquid phase, a medium B that exchanges heat with the medium A, and the medium B flows through the inside. The outer peripheral surface as a heat transfer surface is provided with a tube in contact with the medium A, and the medium B flows through the tube so that the solid phase of the medium A attached to the heat transfer surface can be peeled off. Thus, the above-described problem is solved by a heat exchange device in which the tube is deformed.

  The invention according to claim 4 is a heat transfer surface that comes into contact with the medium A when heat exchange is performed between the medium A and the medium B that can change from a liquid phase to a solid phase or from a solid phase to a liquid phase. In the solid phase peeling method of the heat exchange apparatus for peeling the solid phase of the medium A attached to the medium, the heat transfer surface in contact with the medium A is deformed to change the solid phase of the medium A attached to the heat transfer surface. The above-mentioned problem is solved by a solid phase peeling method of a heat exchange device characterized by peeling.

  According to this invention, since the solid phase adhering to the heat transfer surface of the heat exchange device can be peeled off, the heat transfer property can be improved.

  The heat exchange apparatus of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a principle diagram of a heat exchange device. The heat storage tank 1 is filled with a heat storage material A as a medium A that can change phase from a liquid phase to a solid phase or from a solid phase to a liquid phase. A collapsible tube 2 whose outer peripheral surface 2c serves as a heat transfer surface passes through the heat storage tank 1. Inside the collapsible tube 2, a fluid B flows in the axial direction as a medium B that exchanges heat with the heat storage material A.

  Such a heat exchange device uses latent heat generated when the heat storage material A undergoes a phase change (liquid / solid) and is also called a latent heat storage device. As the heat storage method, for example, ice heat storage using latent heat of water, or heat storage using latent heat of a heat storage material having a melting point of 80 ° C., for example, can be considered. In the case of ice heat storage, water is used as the heat storage material A, and a coolant that does not freeze up to −20 ° C., for example, is used as the fluid B flowing inside the collapsible tube 2. In the case of the thermal storage, the heat storage material A is a material having a melting point of 80 ° C., and the fluid B is water, for example.

  In the case of heat storage, a fluid B having a temperature higher than the melting point of the heat storage material A is caused to flow into the collapsible tube 2. As a result, heat is conducted from the fluid B to the heat storage material A through the collapsible tube 2, and the heat storage material A changes from a solid phase to a liquid phase. On the other hand, in the case of heat dissipation, a fluid B having a temperature lower than the melting point of the heat storage material A is caused to flow into the collapsible tube 2. Thereby, heat is conducted from the heat storage material A to the fluid B through the collapsible tube 2, and the heat storage material A changes from a liquid phase to a solid phase.

  In this principle diagram, the heat storage material A is stored inside the heat storage tank 1 and does not flow, but the heat storage material A may flow. In this case, the heat storage tank 1 is provided with an inlet and an outlet for the heat storage material A. The liquid heat storage material A enters from the inlet of the heat storage tank 1, and the slurry heat storage material A mixed with the solid phase and the liquid phase exits from the outlet of the heat storage tank 1.

  In the case of heat dissipation, a solid phase in which the heat storage material A has changed in phase adheres to the outer peripheral surface 2 c of the collapsible tube 2. The present embodiment is characterized in that the solid phase attached to the outer peripheral surface 2 c of the collapsible tube 2 is peeled off by deforming the collapsible tube 2.

  The collapsible tube 2 will be described. The collapsible tube 2 is a tube having elastic properties, such as a vein, airway, urethra, etc. in a living body, and is easily deformed and crushed when the tube external pressure becomes relatively higher than the tube internal pressure.

  As shown in FIG. 1, when a pressure difference (P1> P2 or P1 <P2) occurs between the pressure P1 on the upstream side of the collapsible tube and the pressure P2 on the downstream side, the collapsible tube 2 may partially expand. The parts 2 a and 2 b that are crushed are generated, and the parts 2 a and 2 b that are swelled and crushed propagate in the axial direction of the collapsible tube 2. Even if there is no pressure difference between the upstream and downstream of the collapsible tube 2, a similar phenomenon occurs when the fluid flowing inside the collapsible tube 2 pulsates. This phenomenon is also called self-excited vibration of the collapsible tube 2 in which the fluid flowing inside the collapsible tube 2 and the deformation of the collapsible tube 2 interfere with each other. In the present embodiment, the solid phase attached to the outer peripheral surface 2 c of the collapsible tube 2 is peeled off by utilizing the deformation phenomenon of the collapsible tube 2.

  The material, thickness, pipe diameter, etc. of the collapsible tube 2 are not particularly specified as long as the collapsible tube 2 can be crushed by applying an upstream / downstream pressure difference. As the material of the collapsible tube 2, a resin-based material having elasticity such as silicon can be used.

  FIG. 2 shows a heat exchange device according to the first embodiment of the present invention. The heat storage tank 1 is filled with a heat storage material A. The collapsible tube 2 passing through the inside of the heat storage tank 1 forms a part of the circulation circuit 3. A fluid is input to the circulation circuit 3 via the input three-way valve 4 and a fluid is output via the output three-way valve 5. The fluid B is the same as that described in FIG.

  The pump 6 incorporated in the circulation circuit 3 generates a steady flow. Due to the steady flow by the pump, a pressure difference is generated between the upstream side and the downstream side of the flow inside the collapsible tube 2. On the other hand, the external pressure of the collapsible tube 2 is substantially constant. The collapsible tube 2 partially swells or collapses due to the pressure difference between the upstream and downstream inside the collapsible tube 2. Due to the deformation of the collapsible tube 2, the solid phase attached to the surface of the collapsible tube 2 is peeled off.

  A flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. In FIG. 2, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 3 shows a heat exchange device according to the second embodiment of the present invention. About the thermal storage tank 1, the thermal storage substance A, the collapsible tube 2, and the fluid B, since it is the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In this embodiment, a pump capable of generating a pulsating flow is used for the pump 6, and the collapsible tube 2 is deformed using the pulsating flow of the pump 6.

  In the heat exchange apparatus according to the second embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. Further, in FIG. 3, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 4 shows a heat exchange device according to the third embodiment of the present invention. About the thermal storage tank 1, the thermal storage substance A, the collapsible tube 2, the fluid B, and the pump 6, since it is the same structure as the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In the third embodiment, a branch pipe 8 is provided between the pump 6 and the collapsible tube 2 in order to deform the collapsible tube 2 using the natural frequency of the collapsible tube 2. Sound waves are introduced into the fluid from

  In the heat exchange apparatus according to the third embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. In FIG. 4, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 5 shows a heat exchange device according to a fourth embodiment of the present invention. When there is a density difference between the solid phase and the liquid phase of the heat storage material A (density solid phase> liquid phase), it is desirable to arrange the collapsible tube 2 at the top of the heat storage tank 1 as in this embodiment. When arranged in this way, the area for storing the solid phase peeled below the collapsible tube 2 can be made large, so that the heat storage efficiency is improved.

  In the heat exchange device according to the fourth embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. In FIG. 5, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 6 shows a heat exchange device according to the fifth embodiment of the present invention. When there is a density difference between the solid phase and the liquid phase of the heat storage material A (density solid phase <liquid phase), it is desirable to arrange the collapsible tube 2 at the lower part of the heat storage tank 1 as in this embodiment. If arranged in this way, the area for storing the separated solid phase above the collapsible tube 2 can be made large, so that the heat storage efficiency is improved.

  In the heat exchange apparatus according to the fifth embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. In FIG. 6, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 7 shows a heat exchange device according to the sixth embodiment of the present invention. In this embodiment, a fluid inlet 9 and an outlet 10 are provided in a container covering the outside of the collapsible tube 2 so that the fluid flows also outside the collapsible tube 2. As an embodiment, the fluid B is allowed to flow outside the collapsible tube 2, and the heat storage material A is allowed to flow inside the collapsible tube 2.

  On the contrary, the heat storage material A may be flowed outside the collapsible tube 2 and the fluid B may be flowed inside the collapsible tube 2. In this case, the liquid heat storage material A enters from the inlet 9 of the container, and the slurry heat storage material A in which the solid phase and the liquid phase are mixed exits from the outlet 10 of the container. The collapsible tube is deformed by the pressure difference between the upstream and downstream.

  In the heat exchange apparatus according to the sixth embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. In FIG. 7, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side.

  FIG. 8 shows a heat exchange apparatus according to the seventh embodiment of the present invention. This heat exchange device is for performing heat exchange more quickly, and a plurality of collapsible tubes 2 are installed in parallel inside the heat storage tank 1. The plurality of collapsible tubes 2 are connected in parallel in the circulation circuit. In other words, the circulation circuit is branched into a plurality of portions in the vicinity of the connection points with both ends of the collapsible tube 2, and the branch pipes are respectively connected to the end portions of the collapsible tube 2. As in this embodiment, the number and arrangement of the collapsible tubes 2 can be variously set according to the degree of heat exchange.

  In the heat exchange apparatus according to the seventh embodiment, a flow rate adjusting device 7 such as a valve may be disposed between the pump 6 and the collapsible tube 2. Further, in FIG. 8, the pump 6 and the flow rate adjusting device 7 are arranged on the upstream side of the collapsible tube 2, but may be arranged on the downstream side. Further, the collapsible tube is oriented in the vertical direction, but may be oriented in the horizontal direction.

  The present invention is not limited to the above embodiment and can be variously modified. For example, the tube is not limited to a collapsible tube as long as it can be deformed by a pressure difference between upstream and downstream. Further, the heat transfer surface is not formed in a cylindrical shape (the outer peripheral surface 2c of the collapsible tube), and may be a flat surface, for example. Further, the heat transfer surface may be deformed using a drive mechanism such as a piezo actuator.

The principle diagram of a heat exchange device. The system diagram which shows the heat exchange apparatus in the 1st Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 2nd Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 3rd Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 4th Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 5th Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 6th Embodiment of this invention. The system diagram which shows the heat exchange apparatus in the 7th Embodiment of this invention.

Explanation of symbols

2. Collapsible tube A ... Thermal storage material (medium A)
B ... Fluid (medium B)

Claims (4)

A medium A that can change phase from a liquid phase to a solid phase or from a solid phase to a liquid phase; a medium B that exchanges heat with the medium A; and a heat transfer surface provided between the medium A and the medium B. With
The heat exchange device, wherein the heat transfer surface can be deformed so that the solid phase of the medium A adhering to the heat transfer surface can be peeled off. The heat transfer surface is an outer peripheral surface of a tube through which the medium B flows,
The heat exchange apparatus according to claim 1, wherein the tube is deformed when the medium B flows inside the tube. A medium A that can change phase from a liquid phase to a solid phase or from a solid phase to a liquid phase, a medium B that exchanges heat with the medium A, the medium B flows through the inside, and an outer peripheral surface serving as a heat transfer surface A tube in contact with the medium A,
The heat exchange apparatus, wherein the tube is deformed by flowing the medium B inside the tube so that the solid phase of the medium A attached to the heat transfer surface can be peeled off. When performing heat exchange between the medium A and the medium B that can change phase from the liquid phase to the solid phase or from the solid phase to the liquid phase,
In the solid phase peeling method of the heat exchange apparatus for peeling the solid phase of the medium A attached to the heat transfer surface in contact with the medium A,
A method for solid phase separation of a heat exchange device, wherein the heat transfer surface contacting the medium A is deformed, and the solid phase of the medium A adhering to the heat transfer surface is peeled off.

Images