WO2020138534A1

WO2020138534A1 - Solar collector

Info

Publication number: WO2020138534A1
Application number: PCT/KR2018/016713
Authority: WO
Inventors: 김윤정
Original assignee: 김윤정
Priority date: 2018-12-26
Filing date: 2018-12-27
Publication date: 2020-07-02
Also published as: KR20200079966A

Abstract

The present invention relates to a solar collector. The present invention provides a solar collector comprising: a heat collection part which is made of a flexible material and in which a heat collection medium is received; a heat insulation part which is made of a flexible material and surrounds the heat collection part and in which a heat insulation gas is received; and a protection film which surrounds the heat insulation part, wherein the protection film is spaced a predetermined distance apart from the heat insulation part in all positions of the heat insulation part.

Description

Solar collector

The present invention relates to a solar heat collector, and more particularly, to a solar heat collector capable of improving heat collecting performance by minimizing heat loss.

In general, a solar heat collector is a device that converts direct sunlight or scattered light into heat energy, and is the most important part in constructing a solar heat collection system. The collector is fixed in shape and installed in a limited place such as the roof of the building (hereinafter referred to as'fixed collector' for convenience) and the collector is free to install and disassemble, so the collector is not limited to a specific place (hereinafter referred to as'non-fixed' for convenience) Collector'). Air or water is mainly used as a heat collecting medium for the solar heat collector.

Referring to Figure 1, a description of the fixed collector 100 using the conventional air as a heat collecting medium is as follows.

Inside the case 110, a heat collecting duct 120 through which air, which is a heating medium, flows is arranged, and an inlet and an outlet are provided for air in and out. The heat collecting duct 120 is formed by bending in a zigzag manner inside the case 110 using a material having good heat transfer efficiency, such as aluminum. The heat collecting surface of the heat collector 100 is covered with transparent glass or polycarbonate. The collector 100 is usually installed at a certain angle with respect to the ground, but is also installed to be perpendicular to the ground when the reflector 130 is placed as shown in FIG. 1.

The process of collecting the heat using the fixed solar heat collector is as follows. When direct sunlight, reflected light or scattered light of the sun passes through the glass cover and contacts the heat collection duct 120, it is converted into thermal energy. In addition, some sunlight heats the air inside the case 110 due to the greenhouse effect, and heat is transferred to the heat collection duct 120 by convection and conduction of the heated air. The heat transferred to the heat collecting duct 20 heats the air inside the heat collecting duct 120. The heated air exits the collector 100 through the outlet, and is used for heating or hot water production if necessary.

However, these fixed solar collectors are expensive to manufacture and must be installed in a limited place because the shape is fixed, and there is a problem in that it is not free to move the collector to another place after installing the collector. Also, it is not possible to install and disassemble the collector.

The non-fixed collector is intended to solve the above-mentioned disadvantages of the fixed solar collector. Non-fixed collectors are proposed in Korean Patent Publication No. 10-2008-0089954, Korean Patent Publication No. 10-2012-0046945, and the like.

2 and 3, a conventional non-fixed solar heat collector 200 will be described.

The non-fixed solar heat collector 200 is provided with a heat collecting part 210 made of a flexible material that accommodates the heat collecting medium therein. Surrounding the heat collecting part 210, a heat insulating part 220 made of a flexible material that accommodates a heat insulating gas is provided. A part of the heat insulating part 220 is provided with a first reflective part 230 made of a flexible material that reflects sunlight around the heat collecting part 210 to the heat collecting part 210. On the other hand, a protective film 240 of a flexible material surrounding the thermal insulation unit 220 and accommodating a thermal insulation gas is provided between the thermal insulation unit 220 and the ground. In addition, the base film 250 is provided on the ground to prevent moisture penetration from the ground and reduce heat loss. In addition, a part of the base film 250 is provided with a reflector 260 for reflecting sunlight.

As the heat collecting medium accommodated in the heat collecting part 210, it is preferable to use water or air that can be easily obtained from the surroundings, and it is preferable to use air for the heat keeping gas accommodated in the heat keeping part 220. In addition, the heat collecting part 210 and the heat insulating part 220 are preferably made of a flexible material such as vinyl-based resin so as to swell when the heat collecting medium or the heat insulating medium is inserted. The protective film 240 may also be made of a flexible material, for example, vinyl-based resin, and air may be accommodated in the protective film 240.

The sunlight passes through the protective film 240 and the warming part 220 and goes directly to the heat collecting part 210 (A), or is repeatedly reflected and goes to the heat collecting part 210 (B, C, D).

Referring to FIG. 3, the problem of the conventional non-fixed solar heat collector will be described.

The solar heat collector 200 ultimately collects heat with a heat collecting medium inside the heat collecting part 210. Therefore, in order to maximize the heat collection performance, it is necessary to minimize not only maximizing heat collection with the heat collecting medium, but also heat dissipated from the heat collecting medium and heat loss.

However, in the conventional solar heat collector 200, there is a problem that there is a lot of heat discharged from the heat collecting medium to the outside again. The reason is as follows.

The temperature (T1) inside the heat collecting part 210, the temperature (T2) inside the heat keeping part 220, the temperature (T3) inside the protective film 240, and the outside temperature (T4) will be different depending on each location, of course, From a qualitative point of view, approximately T2> T3> T4. (In FIG. 3, in order to qualitatively compare each temperature, for convenience, each temperature is displayed in a vertical direction from the ground.)

Due to this temperature difference, it is difficult to avoid heat generated by heat collected in the heat collecting part 210 being transferred to the outside through the heat keeping part 220 and the protective film 240. However, it is desirable to minimize heat loss even if heat loss due to the temperature difference cannot be avoided.

By the way, as shown in FIG. 3, in the conventional solar heat collector, a part of the protective film 240, that is, the upper side, is in direct contact with the heat insulating part 220. The temperature difference is (T2-T4) in a portion where the protective film 240 and the thermal insulation part 220 are in direct contact. However, the temperature difference between the portion where the insulating part 220 and the protective film 240 does not directly contact is (T3-T4). That is, the temperature difference is relatively large in a portion where the protective film 240 and the thermal insulation part 220 are in direct contact. Therefore, there is a problem that heat loss through this part is particularly large. In addition, if the heat loss is large, there is a problem that the heat collection efficiency of the solar heat collector also decreases.

The present invention is to solve the above-mentioned problems, the object of the present invention is to provide a solar heat collector capable of minimizing the heat loss caused by heat transfer back to the outside.

Another object of the present invention is to provide a solar heat collector that can improve heat collection efficiency by minimizing heat loss.

According to an exemplary embodiment of the present invention, the present invention includes a heat collecting portion of a flexible material for receiving a heat collecting medium therein; A flexible heat insulating part surrounding the heat collecting part and accommodating a heat insulating gas therein; It includes a protective film surrounding the insulating portion, and the protective layer provides a solar heat collector provided at a predetermined distance from all positions of the insulating portion.

According to an exemplary embodiment, the protective film may have a curvature corresponding to the warming portion.

According to an exemplary embodiment, in the case of the same separation distance between the insulating film and the upper portion of the insulating film, the insulating film preferably has a shape in which a space between the insulating film and the protective film is maximized. The space formed of the protective film and the ground may be formed in a square shape. The space formed of the protective film and the ground may be configured in a pentagonal shape.

According to an exemplary embodiment, a support member for supporting the protective film may be further provided. The support member may have a curvature corresponding to the protective film.

According to an exemplary embodiment, the support member is provided with a pipe having a small diameter, and the support member may be arranged with a plurality of spaced apart predetermined intervals.

Each feature of the above-described embodiments may be implemented in combination in other embodiments, unless contradictory or exclusive to the other embodiments.

The solar collector according to the present invention described above has the following effects.

First, according to the present invention, there is an advantage in that heat collected in the heat collecting portion of the solar heat collector can be minimized due to heat transfer back to the outside.

Second, according to the present invention, there is an advantage that can maximize the heat collection efficiency of the solar collector.

Third, according to the present invention, it is possible to freely gradient the protective film using a support member. Therefore, there is an advantage in that a gradient that can prevent contamination due to collapse of the protective film or rainwater can be freely determined.

Third, according to the present invention, there is an advantage that the protective film can be firmly supported by using a support member.

1 is a perspective view showing a conventional fixed solar collector.

Figure 2 is a perspective view showing a conventional non-fixed solar collector.

3 is a cross-sectional view of FIG. 2.

4 is a cross-sectional view showing an embodiment of a solar heat collector according to the present invention.

5 is a cross-sectional view showing another embodiment of a solar heat collector according to the present invention.

Hereinafter, preferred embodiments of the solar heat collector according to the present invention will be described with reference to the accompanying drawings. Hereinafter, the components and the like of the present invention will be described with reference to specific drawings and examples, which are merely used to help the understanding of the present invention. In addition, in the embodiments below, specific components may be exaggerated or reduced for illustration convenience, and may be illustrated or described, but this is also for understanding the present invention. Therefore, the present invention is not limited to the form described in the embodiments or drawings to be described below, and those skilled in the art to which the present invention pertains can make various modifications and variations from these descriptions, and such modifications and variations It is the scope of the present invention.

4, an embodiment of a solar heat collector according to the present invention will be described.

Among the components of this embodiment, the same components as in the prior art use the same names and drawing numbers as in the prior art. In addition, in order to avoid the complexity of the description, detailed descriptions of the components substantially the same as those of the prior art among the components of the present embodiment are omitted, and description will be limited to contents related to the subject matter of the present embodiment.

Also in this embodiment, the heat insulating part 220 of the flexible material is provided to surround the heat collecting part 210 of the flexible material. A first reflective portion 230 made of a flexible material that reflects sunlight around the heat collecting portion 210 to the heat collecting portion 210 may be provided on a portion of the heat keeping portion 220. In addition, a base film 250 may be provided on the ground, and a reflective part 260 may be provided on a part of the base film 250.

Water or air may be used as the heat collecting medium accommodated in the heat collecting part 210, and air may be used as the heat keeping gas accommodated in the heat keeping part 220.

On the other hand, in the present embodiment, a protective film 240a is provided to surround the heat insulating part 220. The protective film 240a is preferably a flexible material. However, in the present embodiment, the insulating part 220 and the protective film 240a are separated from each other by a predetermined distance. That is, unlike the prior art, there is no part in which the heat insulating part 220 and the protective film 240a are in direct contact.

The details are as follows.

In FIG. 4, the other non-fixed solar heat collectors (the heat collectors of FIG. 3) have the same conditions, and only a portion where the heat insulating part 220 and the protective film 240a directly contact each other is separated by a predetermined distance (L). .

In the conventional non-fixed solar heat collector, the space (hereinafter referred to as'protected space' for convenience) formed by the heat insulating part 220 and the protective film 240 (the protective film of FIG. 3 and the dotted line in FIG. 4) is S1. However, according to the present embodiment, a protection space of S2 is additionally secured. That is, the protection space in this embodiment becomes [S1 + S2].

On the other hand, the relationship between the temperature (T2) inside the thermal insulation section, the temperature (T3) inside the protective film, the temperature (T3a) and the outside temperature (T4) of the additional protection space is T2> T3> T3a> T4.

In addition, in the present embodiment, heat loss is generated at the upper portion of the heat insulating part 220 through the additional protection space S2. That is, heat loss occurs between the additional protection space S2 and the outside. However, the difference between the additional protection space S2 and the outside temperature is (T3a-T4). On the other hand, in the prior art, direct heat transfer occurs between the upper part and the outer part of the warming part 220, and the temperature difference between the two is (T2-T4).

By the way, (T3a-T4) is smaller than (T2-T4). Therefore, in the case of this embodiment, heat loss due to heat transfer to the outside is reduced compared to the prior art.

Meanwhile, the space between the heat keeping part 220 and the protective film 240a may serve as a kind of heat insulating space. However, in the case of the prior art, this space is S1, but in this embodiment, it becomes [S1 + S2], which is as large as S2. Therefore, even from this point of view, heat loss is reduced.

In summary, according to the present embodiment, since the heat insulating part 220 and the protective film 240a do not directly contact each other, heat loss caused by heat transfer from the heat insulating part 220 to the outside can be minimized. In addition, a sufficient space between the insulating portion 220 and the protective layer 240a is secured to minimize heat loss caused by heat transfer from the insulating portion 22 to the outside.

On the other hand, as described above, when the protective film 240a is installed spaced apart from the insulating part 220 in all parts, a support member 300a for supporting the protective film 240a may be provided.

The support member 300a is preferably formed with a pipe having a small diameter at a desired curvature, and a heat insulating film is preferably installed outside the support member 300a. The curvature of the support member 300a may correspond to the curvature of the protective film 240a. For example, the curvature of the support member 300a is preferably the same as the curvature of the protective film 240a.

In addition, it is preferable that a plurality of support members 300a are spaced apart from each other by going from front to back.

On the other hand, in this embodiment, the protective film 230a is provided using a support member 300a corresponding to the shape of the protective film 240a. Therefore, the gradient of the protective film 230a can be made free. Therefore, the gradient of the protective film 230a can be freely determined so as to prevent contamination of the protective film 230a or contamination due to rainwater.

In addition, in this embodiment, the protective film 240a is supported using the support member 300a. Therefore, the protective film 240a can be firmly supported.

5, another embodiment of a solar heat collector according to the present invention will be described.

This embodiment is similar in principle to the above-described embodiment. However, the shape of the protective film 240b of this embodiment is different from the shape of the protective film 240a of the above-described embodiment.

The details are as follows.

In this embodiment, it is possible to maximize the space between the protective film and the warm portion. For example, in the case of the same width (W) and the upper separation distance (L) of the lower portion, it is desirable to secure the maximum possible protection space. That is, it is preferable that the protective space is maximized when the distance L spaced apart from the upper portion of the insulating portion 220 is the same based on the width W of the same lower portion.

The shape of the protective film is not limited, but the cross section of the space formed of the protective film 240b and the ground may be formed in a substantially rectangular shape. When configured in this way, when based on the same lower width (W), it is possible to maximize the space between the protective film 240b and the warm portion 220.

The details are as follows.

When comparing the prior art, the above-described embodiment and this embodiment will be described.

The protection space of the prior art is S1, the protection space of the above-described embodiment is [S1 + S2], and the protection space of the present embodiment is [S1 + S2 + S3]. Therefore, when it is based on the same width (W), the protection space of the present embodiment is the largest. Therefore, according to the present embodiment, it is possible to minimize not only the heat loss at the upper portion of the heat insulating portion 220, but also the heat loss at the side (approximately diagonal direction) of the heat insulating portion 220.

Meanwhile, in the present embodiment, it is preferable that a supporting member 300b for supporting the protective film 240b is provided. The support member 300b may include a vertical member 310 and a horizontal member 320. The vertical member 310 extends from the bottom of the point spaced a predetermined distance from the warming part 220 to the top. It is preferable that the vertical member 310 extends upwardly at least longer than the diameter of the heat keeping part 220. The horizontal member 320 is a member connecting the upper left and right vertical members 310.

On the other hand, in this embodiment, the cross-section of the space formed of the protective film 240b and the ground is illustrated and described, but the present invention is not limited thereto. For example, the cross section of the space formed of the protective layer 240b and the ground may be configured in a substantially pentagonal shape. In this way, it is possible to maximize the space between the protective film 240b and the warming part 220 and at the same time give a gradient over the protective film 240b. In this case, the vertical member 310 and the horizontal member 320 are not directly connected, and an inclined member 315 that is approximately inclined between the tip of the vertical member 310 and one end of the horizontal member 320 is additionally added. It is preferably provided. The inclined member may be configured in a curved shape.

In addition, the horizontal member 320 of the protective film 240b may be configured as a hemispherical shape, a triangle, or the like, to give a gradient to the upper portion of the protective film 240b. In addition, the vertical member 310 may be configured to have a slight inclination inward.

When configured in this way, by the gradient of the upper portion of the protective layer 240b, snow, rain, dust, etc., which may accumulate on the upper outer surface of the protective layer 240b, may not be accumulated on the upper outer surface of the protective layer and may be swept down well. Therefore, the sunlight passes through the protective film well, and the heat collection performance is improved.

Meanwhile, in each of the above-described embodiments, at least one of the other embodiments may be equally applied to portions not separately described. In addition, unless otherwise arranged, technical matters described in one embodiment may be equally applied in other embodiments, unless otherwise specified.

As described above, the solar heat collector does not directly contact the warming portion and the protective film. Therefore, it is possible to minimize heat loss caused by heat transfer from the heat insulating part to the outside. In addition, a space between the heat insulating part and the protective film, that is, a kind of insulating space is sufficiently secured, and heat loss caused by heat transfer from the heat insulating part to the outside can be minimized. In addition, since the protective film is supported by the support member, the gradient of the protective film can be freed and the protective film can be firmly supported.

As described above, the present invention has been described by means of limited embodiments and drawings with specific details, such as specific components, which are used to help understand the present invention. That is, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can make various modifications and variations from these descriptions, and these modifications and variations are the scope of the present invention.

Claims

A flexible material collecting part accommodating the heat collecting medium therein;

A flexible heat insulating part surrounding the heat collecting part and accommodating a heat insulating gas therein;

It includes a protective film surrounding the insulating portion,

The protective film is a solar heat collector provided at a predetermined distance from all positions of the insulating portion.
The solar collector according to claim 1, wherein the protective film has a curvature corresponding to the warming portion.
The solar collector according to claim 1, wherein the insulating film has a shape in which a space between the insulating film and the protective film is maximized at the same separation distance between the insulating film and the insulating film.
The solar collector according to claim 3, wherein the space formed by the protective film and the ground is in a quadrangular shape.
The solar collector according to claim 3, wherein the space formed by the protective film and the ground is a pentagonal shape.
The solar collector according to any one of claims 1 to 5, further comprising a support member for supporting the protective film.
The solar collector according to claim 6, wherein the support member has a curvature corresponding to the protective film.
According to claim 7, The support member is provided with a pipe having a small diameter, the support member is a solar collector, characterized in that a plurality of spaced apart a predetermined interval.