Heat storage blind

Abstract

To provide a heat storage blind in which slats can maintain a stable shape in spite of phase transition of heat storage materials.SOLUTION: A heat storage blind 1 is provided with multiple slats 2-2 with a heat storage function. Each of the slats 2-2 is configured to be front-back reversible, has a heat storage layer 4 on one side in the front-back direction, and has an insulating layer 5 on the other side. The heat storage layer 4 includes multiple capsule heat storage materials 6-6, and each of the capsule heat storage materials 6-6 includes, inside a solid capsule, a heat storage body which undergoes a phase transition so that it dissipates heat to the surroundings when solidifying and absorbs heat from the surroundings when melting.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a heat storage blind that stores heat by daytime sunlight and dissipates the heat at night.

Background Art

[0002] As a heat storage blind, for example, there is one described in Patent Document 1. The heat storage blind described in Patent Document 1 is a blind in which a large number of slats arranged in parallel can be reversed front and back. One side of the slat is a heat storage layer containing a latent heat storage material, and the other side is a heat insulation layer. The latent heat storage material used in the heat storage layer utilizes the latent heat required for the phase transition between the solid phase and the liquid phase to store and dissipate heat. According to this configuration, during the time when sunlight hits the heat storage blind during the day, the slats themselves store heat due to the solar heat received by the slats. At night or the like, the slats are rotated front and back, and the heat insulation layer suppresses the dissipation of heat to the outside, while allowing the stored heat to be released to the inside.

[0003] In the configuration described in Patent Document 1, the heat storage layer is formed by kneading the latent heat storage material and molding it into a board shape. In this configuration, the volume and shape of the latent heat storage material change with the phase transition. Therefore, there is a problem that the shape of the heat storage layer itself is not stable, resulting in the heat storage layer peeling off from the heat insulation layer or the appearance becoming poor due to unevenness on the surface of the slats.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, an object of the present invention is to provide a heat storage blind in which the slats can maintain a stable shape regardless of the phase transition of the heat storage material.

Means for Solving the Problem

[0006] The present invention is a heat storage blind including a plurality of slats having a heat storage function, wherein each of the plurality of slats is configured to be reversible in front and back, with a heat storage layer on one side in the front and back direction and a heat insulation layer on the other side. The heat storage layer includes a plurality of capsule heat storage materials, and each of the plurality of capsule heat storage materials has a heat storage body encapsulated therein that undergoes a phase transition so as to release heat to the surroundings when solidifying and absorb heat from the surroundings when melting.

[0007] According to this configuration, the shape of the heat storage layer can be made constant both during heat release and heat absorption by the capsule heat storage material.

[0008] Further, the heat storage layer can include a case that is hollow and has rigidity sufficient to maintain its outer shape, and the plurality of capsule heat storage materials disposed in the internal space of the case.

[0009] According to this configuration, by putting a plurality of capsule heat storage materials in the case, it is easy to form a heat storage layer having a certain form.

[0010] Also, the case can be made of metal.

[0011] According to this configuration, heat transfer inside and outside the case (such as heat absorption and heat release to the outside of the case by the capsule heat storage material) is made efficient by the metal case.

Effects of the Invention

[0012] According to the present invention, since the shape of the heat storage layer can be made constant both during heat release and heat absorption by the capsule heat storage material, the slat can maintain a stable shape regardless of the phase transition of the heat storage material.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0014] Regarding the present invention, an embodiment will be taken up and described below together with the drawings showing the outline. The heat storage blind 1 of the present embodiment is provided along a lighting window provided in a living room such as a house. As shown in FIG. 1, the heat storage blind 1 includes a plurality of slats 2 to 2 having a heat storage function. As shown in FIG. 1, the heat storage blind 1 of the present embodiment is a Venetian blind in which a plurality of slats 2 to 2 extend in parallel in the horizontal direction. However, it is not limited to this, and it can also be a vertical blind in which a plurality of slats 2 to 2 extend in parallel in the vertical direction. As a configuration for supporting the plurality of slats 2 to 2, a general blind configuration can be used.

[0015] Each of the plurality of slats 2 to 2 (hereinafter simply referred to as "slat 2") is an elongated strip-shaped body and is rotatably supported around the center in the width direction by a support string 3. The slat 2 is configured to be able to be reversed front and back by rotating by operating the support string 3. The slat 2 has a two-layer structure having a heat storage layer 4 on one side in the front and back directions and a heat insulation layer 5 on the other side.

[0016] In a state where the heat storage blind 1 is provided on the window, during the daytime, as shown in FIG. 2, the heat storage layer 4 of the slat 2 is directed to the outdoor side (the left side in the figure / the side facing the sun in the state of FIG. 2). With the slats 2 in such a direction, during the time period when sunlight hits the slats 2, heat is stored in the heat storage layer 4 by the solar heat received by the slats 2.

[0017] On the other hand, in a time period when the room temperature has decreased compared to a time period when sunlight was hitting the window, such as at night, as shown in FIG. 3, the slats 2 are rotated so as to reverse the front and back. In the heat storage blind 1 in which a plurality of slats 2 to 2 are in this state, the heat insulating layer 5 facing the outdoor side suppresses the heat dissipation to the outside, and at the same time, the heat stored in the heat storage layer 4 can be released to the inside of the room. Thereby, the temperature inside the room can be raised, and the heating cost can be saved accordingly.

[0018] As shown in FIG. 4, the heat storage layer 4 of the present embodiment includes a plurality (a large number) of capsule heat storage materials 6 to 6 (note that FIG. 4 shows the capsule heat storage material 6 deformed for understanding and enlarged compared to the actual size). The heat storage layer 4 is hollow and includes a case 7 having a rigidity sufficient to maintain its outer shape without causing bending, buckling, etc. under the usage conditions as a blind. The plurality of capsule heat storage materials 6 to 6 are arranged in the internal space of the case 7. That is, the case 7 holds the plurality of capsule heat storage materials 6 to 6. The case 7 of the present embodiment is configured to cover the heat storage layer 4 and the heat insulating layer 5 together. The thickness dimension of the heat storage layer 4 is set to, for example, 1.5 mm to 5 mm.

[0019] The heat insulating layer 5 of the present embodiment is formed by molding a heat insulating material into a plate shape. As the heat insulating material, for example, various foamed resins can be used. In the present embodiment, the heat insulating layer 5 is flat, and the plate thickness is set to, for example, 1.5 mm to 5 mm.

[0020] Case 7 has a heat transfer performance that enables heat transfer between a plurality of capsule heat storage materials 6 to 6 supported outside and inside the heat storage layer 4, and between the heat insulation layer 5. In this embodiment, it is made of metal with a higher thermal conductivity than resin or the like, for example, made of an aluminum alloy. Note that case 7 is not limited to being made of metal, and other materials can also be used. The material to be adopted is preferably a member having a thermal conductivity as high as that of metal and a small amount of deformation due to heat (similar to that of metal). With this metal case 7, heat absorption and heat dissipation to the outside of case 7 by the plurality of capsule heat storage materials 6 to 6 are made efficient, and heat insulation by the heat insulation layer 5 is made efficient. Case 7 can be manufactured, for example, by extrusion molding. The thickness of the peripheral portion (the portion surrounding the internal space) in case 7 is preferably thin from the viewpoint of heat transfer, but if it becomes thin, the rigidity decreases and there is a risk of deformation, so a reinforcing portion such as a rib may be provided inside to ensure rigidity.

[0021] Also, in the internal space of case 7, it is preferable that the plurality of capsule heat storage materials 6 to 6 are filled so that the remaining space is minimized. Specifically, it is preferably filled in a state where the spherical (substantially spherical) capsule heat storage materials 6 are always in contact with each other. This is because if the space between the capsule heat storage materials 6 and 6 is large, the plurality of capsule heat storage materials 6 to 6 can move (flow) in the internal space of case 7 with a certain degree of freedom, and there is a possibility that the heat storage performance varies depending on the position in case 7.

[0022] Each of the capsule heat storage materials 6-6 is integrated with a solid capsule (microcapsule) 61 that contains a heat storage body 62 that undergoes a phase transition to dissipate heat to the surroundings when solidifying and absorb heat to the surroundings when melting. The capsule 61 is made of resin, and for example, melamine resin or acrylic resin can be used. Other resins can also be used. The heat storage body 62 is a material that becomes gel-like or liquid when melted, and is mainly made of inorganic hydrate, specifically, in this embodiment, paraffin (more specifically, normal paraffin), which is a common heat storage material. Materials other than paraffin can also be used. The capsule heat storage material 6 in which the heat storage body 62 is contained has a powdery appearance macroscopically and a spherical (approximately spherical) shape microscopically. The particle size of each capsule is 50 to 100 μm, but is not particularly limited to this. A large number of capsule heat storage materials 6-6 in powder form are filled in the case 7. For this filling, the case 7 can be configured to have, for example, an openable and closable lid at the longitudinal end, so that the lid is opened when the capsule heat storage material 6 and the insulating layer 5 are enclosed, and closed after the enclosing is complete.

[0023] In this way, in the capsule heat storage material 6, the heat storage body 62, which is a relatively soft material (gel or liquid when melted), is enclosed inside the capsule 61, which is a relatively hard material (resin), so that the capsule 61 absorbs the volume change accompanying the phase transition of the heat storage body 62. Moreover, since the capsule 61 is spherical, even if the internal pressure increases with the phase transition of the heat storage body 62, this internal pressure can be absorbed by the capsule 61. Therefore, the size of the capsule 61 itself can be made not to change regardless of the phase transition of the heat storage body 62. Therefore, the capsule heat storage material 6 can keep the shape of the heat storage layer 4 constant both during heat release and heat absorption.

[0024] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the present invention.

[0025] For example, the plurality of capsule heat storage materials 6 to 6 may not be limited to being encapsulated in the case 7 as in the above embodiment, but may be kneaded into a support material (such as putty) such as resin and the heat storage layer 4 may be formed by applying it to the heat insulation layer 5 or the like. However, if the blending ratio of the support material increases and the capsule heat storage material 6 is buried in the support material, it will affect the function (heat storage and heat release) of the heat storage layer 4. Therefore, the capsule heat storage material 6 in this form is preferably exposed on the surface of the heat storage layer 4.

[0026] Also, the case 7 in the above embodiment is in a form that collectively covers the heat storage layer 4 and the heat insulation layer 5, but it may be in a form that covers only the heat storage layer 4, for example. In this case, the case 7 is superposed and integrated with the heat insulation layer 5 in the front-back direction. The integration can be performed by various methods, for example, by adhesion to the heat insulation layer 5 or pin fixing.

[0027] Also, the heat insulation layer 5 in the above embodiment is a heat insulation material formed into a plate shape (such as a foamed resin plate), but it is not limited to this, and for example, it can have various structures such as providing a vacuum layer inside to have a heat insulation effect.

Explanation of reference numerals

[0028] 1 Heat storage blind 2 Slat 3 Support string 4 Heat storage layer 5 Heat insulation layer 6 Capsule heat storage material 61 Capsule 62 Heat storage body 7 Case

Claims

Claim 1 A heat storage blind comprising a plurality of slats having a heat storage function, each of the plurality of slats is configured to be reversible in front and back, and has a heat storage layer on one side in the front and back direction and a heat insulation layer on the other side, the heat storage layer comprises a plurality of capsule heat storage materials, each of the plurality of capsule heat storage materials is a heat storage blind in which a heat storage body that undergoes a phase transition so as to radiate heat to the surroundings when solidifying and absorb heat from the surroundings when melting is enclosed inside a capsule made of a solid. Claim 2 The heat storage blind according to claim 1, wherein the heat storage layer comprises a case that is hollow and has rigidity sufficient to maintain its outer shape, and the plurality of capsule heat storage materials disposed in the internal space of the case. Claim 3 The heat storage blind according to claim 2, wherein the case is made of metal.

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