WO2020138535A1

WO2020138535A1 - Batch type solar water heater

Info

Publication number: WO2020138535A1
Application number: PCT/KR2018/016717
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: KR20200079967A; KR102196847B1

Abstract

The present invention relates to a batch type solar water heater. The present invention provides a batch type solar water heater comprising: a heat collection part which is made of a flexible material, receives water as a heat collection medium therein, has a closed space as a whole, and can be selectively opened or closed on one side thereof so as to selectively inject or extract the water therein or therefrom; and a communication member which is disposed in a predetermined position of the heat collection part, communicates with the heat collection part on one side thereof, and communicates with the atmosphere on the other side thereof.

Description

Batch solar water heater

The present invention relates to a solar water heater, and more particularly, to a batch type solar water heater for heating without circulating water.

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'). The heat collecting medium of the solar heat collector is mainly air or water.

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 passes through the solar collector 100 through the outlet, and is used for heating or hot water production as needed.

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.

Among non-fixed solar heat collectors, solar heat collectors (hereinafter referred to as'solar water heaters') that directly heat water as a heat collecting medium have been proposed. The solar water heater has a method of circulating water (hereinafter referred to as a'circulating solar water heater') and a method of not circulating water (hereinafter referred to as a'batch-type solar water heater').

2 and 3, a conventional non-fixed batch type solar water heater 200 will be described.

The heat collecting medium is accommodated in the inside of the heat collecting part 210 made of a flexible material. In addition, a heat insulating part 220 surrounding the heat collecting part 210 may be provided, and the heat keeping medium may be accommodated in the heat keeping part 220.

Meanwhile, in a solar water heater, water is used as a heat collecting medium accommodated in the heat collecting unit 210. It is preferable to use air as the warming gas accommodated in the warming unit 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 sunlight passes through the heat keeping part 220 to reach the heat collecting part 210, and heats the heat collecting medium of the heat collecting part 210, that is, water.

On the other hand, in the batch-type solar water heater, the water inlet portion 212 is provided only at one end of the heat collecting portion 210, and the other end portion 218 is blocked. In addition, an insulator 222 is provided at one end of the insulator 220.

Therefore, when water, which is a heat collecting medium, is injected through the water inlet 212, and when water is drawn out, when a negative pressure is formed on the water inlet 212 side, the heat collecting part 210 is made of a flexible material, so that the cross section is As it becomes flat, the water inside it will escape. The insulating gas may be injected through the insulating gas inlet 222 separately from the water.

Meanwhile, as illustrated in FIG. 3, a first reflective film 230 may be provided on one side of the heat keeping part 220. The first reflective film 230 reflects sunlight to the heat collecting part 210. In addition, the base film 250 is installed on the ground, it is preferable to prevent the penetration of moisture from the ground and reduce heat loss. A portion of the base film 250 may be provided with a second reflective film 260 that reflects sunlight to the heat collecting portion 210 or the first reflective film 230. In addition, fixing films 270 provided on both sides of the base film 250 and fixed to the ground may be provided to pull the protective film 240 tightly.

Referring to FIG. 4, an example of a solar thermal water system to which a batch solar water heater is applied will be described.

A heat storage device 500 that heats up the heat storage medium is connected to the batch-type solar heat collector 200. The collector 200 includes a collector 210 and a warmer 220, and may also include a protective film 240. Water may also be used as a heat storage medium, and hereinafter, water is used as a heat storage medium.

The water warmed by the batch-type solar heat collector 200 is sequentially exchanged with the water of the heat storage device 500 to gradually increase the temperature of the water of the heat storage device 500. To this end, a connection device 600 for moving water by forming a flow path through which water can move may be provided between the heat storage device 500 and the solar heat collector 200. It may also include a control device 700 for controlling the supply and circulation of water.

An example of the connection device 600 will be described.

A first flow path 610 for supplying relatively low-temperature water to the heat collecting part 210 of the heat collector 200 is provided at the bottom of the heat storage device 500. A second flow path 620 is provided on the heat storage device 500 to heat the heat collector 210 of the heat collector 200 and supply relatively hot water to the heat storage device 500. In addition, a third flow path 630 is connected to the heat collecting part 210 of the heat collector 200. And where the first flow path 610, the second flow path 620, and the third flow path 630 meet, a three-way valve 640 for adjusting the flow direction of the water is provided. In addition, it is preferable to include a pump 650 that pulls water heated in the heat collecting part 210 to the upper portion of the heat storage device 500 through the third flow path 630 and the second flow path 620. Do.

Meanwhile, the control device 700 controls supply and circulation of water, and

temperature sensors

710 and 720 that measure the water temperature of the heat collecting part 210 of the solar heat collector 200 and the water temperature of the heat storage device 500. It is preferable that each is provided. The control device 700 may control the supply and circulation of water by controlling the operation of the three-way valve 640 and the pump 650 according to the difference in temperature values measured from the

temperature sensors

710 and 720. have.

Describe the operation of a batch solar hot water system.

First, by operating the three-way valve 640, the second flow path 620 is closed, and the first flow path 610 and the third flow path 630 are communicated. Then, water is supplied into the heat collecting part 210 of the solar water heater 200 by the head pressure of the water stored in the heat storage device 500.

When the water in the heat collecting part 210 of the solar water heater 200 receives solar heat and its temperature increases, and the temperature measured by the two

temperature sensors

710 and 720 becomes a predetermined difference or more, the three-way valve 640 ) To change the flow path so that the first flow path 610 closes and the second flow path 620 communicates with the third flow path 630. Then, the pump 650 is operated to draw up water in the heat collecting part 210 and send it to the heat storage device 500.

Then, the flow of the three-way valve 640 is changed again to supply water to the heat collecting part 210 of the solar water heater 200 to repeat the heat collecting process. As the water supply, solar heat collection, and water extraction are repeated, the temperature of the water stored in the heat storage device 500 gradually increases. When the water is 4°C or higher, the higher the temperature, the smaller the density, so the lower the temperature of the water, the lower the temperature inside the heat storage device 500, and the higher the temperature of the water. Therefore, water supplied from the heat storage device 500 to the heat collecting part 210 of the solar heat collector 200 may be supplied with water at a relatively low temperature.

However, the above-described conventional non-fixed batch type solar water heater has the following problems.

First, in a conventional non-fixed batch type solar water heater, it is not easy to accurately inject water into the heat collecting portion 210 as desired. The reason for this is as follows.

In the batch-type solar water heater, water does not circulate, and water is injected and extracted into the heat collecting part 210 through the water inlet part 212. However, since the heat collecting part 210 of the non-fixed type solar water heater 200 is a flexible material, it is difficult to accurately inject water into the heat collecting part 210 as desired. Because, since the heat collecting part 210 substantially forms a closed space, it is not easy to install a water level sensor or the like therein. Therefore, it is not easy to determine when to stop water injection at the time of water injection. However, if the water injection is small, the heat collection performance is reduced, and if the water injection is large, the heat collecting part 210 of the flexible material may be damaged.

Second, in the conventional non-fixed batch type solar water heater, there is a problem that it is not easy to drain water from the heat collecting part 210. The reason will be described with reference to FIG. 5.

When extracting water from the heat collecting part 210, suction pressure (negative pressure) is applied to the water inlet part 212 using a pump or the like. However, since the heat collecting portion 210 is made of a flexible material, a predetermined portion (A) of the heat collecting portion may be constricted by the suction pressure of the pump. If the constriction to the middle portion of the heat collecting portion 210, the water in the back portion can not be drained. In addition, if a predetermined portion (A) of the heat collecting portion is excessively narrowed, damage may occur in that portion.

The present invention is to solve the above-mentioned problems, the object of the present invention is to provide a batch-type solar water heater that is easy to inject and discharge water into the heat collecting portion of the flexible material.

Another object of the present invention is to provide a batch type solar water heater capable of preventing damage to a heat collecting portion of a flexible material.

Another object of the present invention is to provide a batch type solar water heater capable of improving heat collection performance.

According to an exemplary embodiment of the present invention, the present invention accommodates water, which is a heat collecting medium therein, has a closed space as a whole, and one side can be selectively opened and closed so that the water can be selectively injected or extracted A heat collecting part of material; It is arranged at a predetermined position of the heat collecting portion, one side is in communication with the heat collecting portion and the other side provides a batch type solar water heater comprising a communication member in communication with the atmosphere.

According to an exemplary embodiment, the communication member may be provided at the end of the heat collecting portion. In addition, the communication member may be provided at the front end and the rear end of the heat collecting portion, respectively.

According to an exemplary embodiment, the upper end of the communication member is blocked, and the communication member may be provided with a conduit in which one side communicates with the communication member and the other side communicates with the atmosphere.

According to an exemplary embodiment, the communication member includes a connection part on which one side is connected to the heat collecting part, a communication part on one side communicating with the connection part and a communication part communicating with the atmosphere, and the connection part and the communication part are made of non-flexible material. Can be configured.

According to an exemplary embodiment, the communication member may be provided with a water level sensor for detecting the water level.

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

Batch-type solar water heater according to the present invention described above has the following effects.

First, according to the present invention, there is an advantage that it is easy to inject and discharge water into the heat collecting portion of the flexible material.

Second, according to the present invention, there is an advantage that can prevent damage to the heat collecting portion of the flexible material.

Second, according to the present invention, since it is possible to inject as much water as desired into the heat collecting portion of the flexible material, there is an advantage that the heat collecting performance can be improved.

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

Figure 2 is a perspective view showing a conventional non-fixed batch solar water heater.

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

4 is a cross-sectional view showing an example of a solar hot water system using FIG. 2.

5 is a perspective view showing a state that occurs when water is extracted from the heat collecting part of FIG. 2.

6 is a cross-sectional view showing an embodiment of a batch-type solar water heater according to the present invention.

7 is a cross-sectional view showing another embodiment of a batch type solar water heater according to the present invention.

8 is a cross-sectional view showing another embodiment of a batch type solar water heater according to the present invention.

Hereinafter, a preferred embodiment of the batch type solar water heater 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.

Referring to Figure 6, an embodiment of a batch-type solar water heater 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 water inlet 212 is provided only at one end of the flexible heat collecting part 210, and the other end 218 is blocked. In addition, a valve 640 may be provided at a predetermined position of the water inlet 212.

However, in this embodiment, in order to facilitate the injection and extraction of water into the heat collecting portion 210, a communication member 400 is provided at a predetermined position of the heat collecting portion 210.

The communication member 400 will be described in detail as follows.

One side 414 of the communication member 400 communicates with the heat collecting portion 210 and the other side 412 communicates with the atmosphere (air). That is, the communication member 400 has a function of communicating the inside of the heat collecting unit 210 with the atmosphere.

The shape of the communication member 400 is not limited, but is substantially extended from the heat collecting portion 210 to the top and is preferably cylindrical. In addition, the communication member 400 may be made of a transparent material.

In addition, the installation position of the communication member 400 is not limited, but is preferably installed at the end (opposite to the blocked portion or pump) of the heat collecting portion 210. This is because, at the time of extraction of water, atmospheric pressure is applied to the end of the heat collecting part 210 by the communication member 400, so that the extraction of water is easy.

In addition, the number of the communication members 400 is not limited, but may be provided at each end of the heat collecting unit 210, for example, one at each of the front end 400a and the rear end 400.

The operation principle of the communication member 400 is as follows.

First, the injection of water into the heat collecting part 210 will be described.

The heat collecting part 210 is provided with a communication member 400. However, one side 414 of the communication member 400 communicates with the heat collecting portion 210 and the other side 412 communicates with the atmosphere. Therefore, even when air or the like remains in the heat collecting part 210, air or the like is pushed out through the communication member 400 to the air by water injected into the heat collecting part 210. Therefore, water can be smoothly injected into the heat collecting part 210.

In addition, the communication member 400 may be made of a transparent material. However, when the heat collecting part 210 is filled with water, some of the water rises to the communication member 400. Therefore, the amount of water filled in the heat collecting part 210 can be adjusted while looking at the water of the communication member 400.

In addition, the heat collecting part 210 is in communication with the atmosphere by the communication member 400. Therefore, since the inside of the heat collecting portion 210 of the flexible material can be filled with water by the head pressure, the heat collecting performance is improved. The reason is as follows.

If the head pressure is not applied while the water collecting part 210 of the flexible material is filled, the cross section of the heat collecting part 210 has a shape of an elliptical shape due to the weight of the water. However, as the head pressure of the heat collecting portion 210 is significantly increased, the cross-section of the heat collecting portion 210 becomes closer to a circular shape. The closer the cross-section of the heat collecting portion 210 is to the circular shape, the more sunlight is collected on the heat collecting portion 210. This is because the sunlight reflected from the first reflective film and the second reflective film provided on the ground collects more of the heat collecting portion 210 (see FIG. 3 for the first reflective film and the second reflective film).

Next, the extraction of water from the heat collecting part 210, that is, the extraction of water will be described.

As described above, in the conventional batch type solar heat collector, when water is drained using a pump, a predetermined position may be narrowed at the inlet of the heat collecting part by excessive suction pressure (negative pressure) of the pump. Then, the water at the rear end of the constricted portion of the heat collecting portion is not discharged, but rather the constricted portion of the heat collecting portion may be damaged.

By the way, according to this embodiment, there is a communication member 400 in communication with the atmosphere in the heat collecting unit 210. That is, the heat collecting part 210 is in communication with the atmosphere through the communication member 400. Therefore, a predetermined portion of the heat collecting portion 210 is not constricted and water is discharged from the heat collecting portion 210 smoothly. Therefore, the narrowing and damage of the heat collecting portion 210 is prevented.

Meanwhile, in the above-described embodiment, it has been described that the communication member 400 is made of a transparent material, and the amount of water filled in the heat collecting part 210 is adjusted while viewing the water level inside the communication member 400. However, the present invention is not limited to this.

For example, it is also possible to install the water level sensor 416 on the communication member 400. When the water level sensor 416 is installed, it is possible to control the valve 640 and the pump (see FIG. 4) using the water level value measured by the water level sensor 416. For example, when water is injected into the heat collecting part 210, when the water level measured by the water level sensor 416 becomes a desired water level, the pump may be stopped and the valve 640 may be closed.

Referring to Fig. 7, another embodiment of the batch-type solar water heater according to the present invention will be described.

This embodiment is similar in principle to the above-described embodiment. However, the structure in which the communication member 400 communicates with the atmosphere is different from the above-described embodiment.

The details are as follows.

In this embodiment, the upper end of the communication member 400 is blocked, and a conduit 450 communicating with the atmosphere is provided at a predetermined position of the communication member 400. One side 454 of the conduit 450 communicates with the communication member 400 and the other side 452 communicates with the atmosphere. The conduit 450 can use a tube with a small diameter.

The reason for providing a separate conduit 450 in the communication member 400 is as follows.

As a result of the experiment, the water in the heat collecting part 210 may be heated to about 60 degrees Celsius. Therefore, the water of the communication member 400 may be evaporated and discharged to the outside in a mist form. Then, the mist may adhere to the upper portion of the passivation layer 240 to degrade solar transmission performance. Therefore, it is preferable that a separate conduit 450 is provided in the communication member 400, and the tip of the conduit 450 is exposed to the outside of the protective film 240.

Referring to FIG. 8, an embodiment of a coupling method between the heat collecting part 210 and the communication member 400 will be described.

As described above, in the non-fixed batch type solar water heater, the heat collecting part 210 is made of a flexible material. However, it is not easy for the communication member 400 to be made of a flexible material. Therefore, we propose a method of combining the heat collecting member of the flexible material and the non-flexible communication member as separate members.

The heat collecting part 210 is made of a flexible material. In addition, the communication member 400 is made of non-flexible materials, for example, PVC, and mutually couples the heat collecting member 210 of the flexible material to the communication member 400 of the non-flexible material.

The details are as follows.

The communication member 400 may include a communication part 410 and a connection part 420. For example, one side of the connection portion 420 is connected to the heat collecting portion 210, and the other side is connected to the communication portion 420.

The connection portion 420 is preferably substantially the same shape as the heat collecting portion 210, for example, a cylindrical shape. However, in order to be connected to the heat collecting portion 210, it is preferable that the outer diameter of the connecting portion 420 corresponds to the inner diameter of the heat collecting portion 420. That is, it is preferable to fit one end of the heat collecting portion 210 to the outer diameter of the connecting portion 420 and to tighten the outer surface of the heat collecting portion 210 using a compression tool 460 such as a band or a clamp. With this configuration, it is possible to combine the heat collecting portion 210 and the connecting portion 420 while maintaining airtightness.

Meanwhile, in each of the above-described embodiments, at least one of the other embodiments may be applied to the portions not specifically described. In addition, unless otherwise arranged, technical details described in one embodiment may be applied in substantially the same manner in other embodiments, unless otherwise specified.

As described above, the non-fixed batch type solar water heater can smoothly inject or discharge water into the heat collecting part. In addition, it is possible to prevent the heat collecting portion from being damaged during injection and discharge of water. In addition, since the water can be filled in correspondence with the shape of the heat collecting portion, the heat collecting performance can be improved.

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 heat collecting part of a flexible material that accommodates water as a heat collecting medium therein, has a closed space as a whole, and can be selectively opened and closed on one side to selectively inject or extract the water;

A batch type solar water heater that is disposed at a predetermined position of the heat collecting portion, and one side communicates with the heat collecting portion and the other side includes a communication member communicating with the atmosphere.
The batch type solar water heater according to claim 1, wherein the communication member is provided at an end of the heat collecting part.
The batch type solar water heater according to claim 2, wherein the communication member is provided at the front end and the rear end of the heat collecting part, respectively.
The arrangement according to any one of claims 1 to 3, wherein the upper end of the communication member is blocked, and the communication member is provided with a conduit that has one side communicating with the communication member and the other side communicating with the atmosphere. Solar water heater.
The method according to claim 4, wherein the communication member includes a connection part on which one side is connected to the heat collecting part, a communication part on one side communicating with the connection part and a communication part communicating with the atmosphere, and the connection part and the communication part are non-flexible materials. Features a batch solar water heater.
The batch type solar water heater according to claim 1, wherein the communication member is provided with a water level sensor for sensing the water level.