WO2015072719A1 - Thermal energy storage device - Google Patents

Abstract

The present invention relates to a thermal heat storage device. According to one aspect of the present invention, the thermal heat storage device comprises: a Fresnel lens for concentrating incident light to output the same; a heat collection port located at a lower part of the Fresnel lens to receive the incident light concentrated by the Fresnel lens; a heat pipe of which a portion is inserted into the heat collection port, and which has a heating medium, changing from a liquid state to a gaseous state by the heat collected by the heat collection port, filled therein; a heat-dissipation plate mounted on the outer surface of a portion of the heat pipe to radiate, to the outside, the heat of the heat pipe heated by the heating medium in the gaseous state; a heat exchange unit having the heat-dissipation plate therein and has a heat transfer liquid, which is heated by the heat radiated by the heat-dissipation plate, filled therein; and a heat storage tank connected to the heat exchange unit to receive and store the heated heat transfer liquid of the heat exchange unit and to output, to the heat exchange unit, the heat transfer liquid of which the heat is lost.

Description

Solar thermal storage

The present invention relates to a solar heat storage device.

In general, a device using solar energy is divided into a photovoltaic device using solar light and a solar thermal storage device using solar heat.

A photovoltaic device refers to a device that directly converts solar energy into electrical energy using a solar cell, and a solar heat storage device uses heat to concentrate heat by using a light concentrator. It is a device that heats water or a heat medium and stores it in a heat storage tank for use when needed.

Conventional solar thermal accumulators mainly use a reflector to concentrate sunlight and directly radiate the concentrated solar light to one end of a heat pipe, thereby storing heat in the heat storage tank using an efficient heat transfer effect of the heat pipe. Has a structure.

Therefore, when only the reflector is used, only the sunlight reflected by the reflector is used, so the light integration efficiency is low, and the method of focusing and irradiating sunlight directly onto the heat pipe is difficult to focus on, and is made of metal heat. Due to the nature of the pipe has a disadvantage in that the heat collecting effect is poor.

An example of such a prior art is described in Korean Patent Registration No. 10-0720926 (Registration Date: June 16, 2007).

Therefore, the technical problem to be achieved by the present invention is to reduce the installation space of the heat storage device by performing a heat storage operation by condensing sunlight using a Fresnel lens having a short focal length.

Another technical problem to be achieved by the present invention is to improve the light collection efficiency to increase the performance of the heat storage device.

According to an aspect of the present invention, there is provided a solar heat storage device including a Fresnel lens for condensing and outputting incident light, a heat collecting port positioned under the Fresnel lens to receive incident light collected by the Fresnel lens, and a part of the heat collecting outlet Is inserted into a heat pipe which is filled with a fruit that changes from liquid state to a gaseous state by heat collected by the heat collector, and is mounted on an outer surface of a part of the heat pipe, A heat sink for dissipating heat from the heated heat pipe to the outside, the heat sink is embedded, and a heat transfer liquid heated by heat dissipated by the heat sink is filled with a heat exchange part, and the heat is connected to the heat exchange part. Receives and stores the heat transfer liquid of the heat exchanger and outputs the heat transfer liquid whose heat is lost to the heat exchanger. It includes a heat storage tank.

The heat pipe may be disposed to be inclined uphill toward the heat sink between the heat collecting hole and the heat sink.

It is preferable that the heat collecting tool is provided at the focal position of the Fresnel lens.

The solar heat storage device according to the above feature may further include first and second circulation pipes connected between the heat exchange part and the heat storage tank to circulate the heat transfer liquid between the heat exchange part and the heat storage tank.

The heat collecting port may be coated with aluminum nitride.

The solar heat storage device according to the above-mentioned feature may further include a concave reflector positioned to surround the heat collecting outlet under the heat collecting outlet and reflecting light passing through the Fresnel lens toward the heat collecting outlet.

According to this feature, since the solar light is incident on the heat collecting port using a Fresnel lens having a short focal length, the distance between the Fresnel lens and the heat collecting port is reduced, and the installation space of the heat storage device is reduced.

In addition, since the heat collecting outlet is provided at the focal position of the Fresnel lens, the light collecting efficiency of the heat collecting outlet is improved.

In addition, since a concave reflector is provided below the heat collecting port, and the light passing through the Fresnel lens is reflected back to the heat collecting port, the light collecting efficiency of the heat collecting port is further improved to increase the performance of the heat storage device.

1 is a perspective view of a solar thermal storage device according to an embodiment of the present invention.

2 is a cross-sectional view of the solar thermal storage device shown in FIG.

3 is a conceptual diagram illustrating a state in which sunlight is collected by a fresnel lens and a concave reflector according to an embodiment of the present invention.

4 is a view showing another example of a concave reflector according to an embodiment of the present invention.

5 is a partial plan view of a Fresnel lens.

6 is a view showing a structure in which the heat transfer liquid heated by the plurality of heat exchangers is stored in one heat storage furnace according to one embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of. Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

Embodiments of the invention described with reference to a perspective view specifically illustrate an ideal embodiment of the invention. As a result, various modifications of the drawings, for example, manufacturing methods and / or specifications, are expected. Thus, the embodiment is not limited to the specific form of the illustrated region, but includes, for example, modification of the form by manufacture. For example, regions shown or described as flat may have properties that are generally rough and / or rough. Also, portions shown to have sharp angles may be rounded. Accordingly, the regions shown in the figures are only approximate in nature, and their forms are not intended to depict the exact form of the regions and are not intended to narrow the scope of the invention.

Hereinafter, a solar heat storage device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, in the drawings, the same components or parts are to be noted that the same reference numerals as possible. In addition, in describing the present invention, a detailed description of related known functions or configurations will be omitted in order not to obscure the subject matter of the present invention.

1 to 6, the solar heat storage device 100 according to an embodiment of the present invention is a concave reflector 110 for reflecting incident light, for example, sunlight, upper part of the concave reflector 110 Fresnel lens (120) for collecting and outputting incident light is located in the condenser reflector 110, the heat collecting port 140, located in the space formed between the Fresnel lens 120, A heat pipe 130 partially inserted into the heat pipe 140 and extending in an oblique straight line to penetrate the concave reflector 110, and a heat exchanger 150 into which the other end of the heat pipe 130 penetrates and is inserted into the inside; It is connected to the heat pipe 130 inserted through the heat exchanger 150 and connected to the heat sink 160 mounted inside the heat exchanger 150 and the other side of the heat exchanger 150 opposite to one side. First and second circulation tubes 171, 172, and first and second thermal circulation tubes The heat storage tank 180 connected to the 171 and 172 is provided.

The concave reflector 110 has a concave inner surface as shown in FIG. 1 and the inner space is composed of an empty space. For this reason, the concave reflector 110 is positioned to surround the heat collecting port located in the interior space.

Therefore, the sunlight incident through the Fresnel lens 120 is reflected by the inner surface of the concave shape and irradiated toward the heat collecting port 140 located inside the concave reflector 110.

The concave reflector 110 may have a semi-spherical shape having a semi-circular side surface as shown in FIG. 1, or may have a semi-cylindrical shape having a quadrangular plane and a semi-circular front surface as shown in FIG. 4.

As described above, the Fresnel lens 120 is provided on the top of the concave reflector 110. For this reason, the upper end of the concave reflector 110 in the open state is completely covered with the Fresnel lens 120 to form a closed space except for a portion in which the inner space of the concave reflector 110 is connected to the heat pipe 130.

In general, the Fresnel lens 120 is divided into a plurality of circular band-shaped lens to reduce the thickness of the lens, can be used to collect the light in a narrow area because it can implement a large aperture without increasing the thickness of the lens It is a lens.

Referring to the plan view of the Fresnel lens 120, as shown in FIG. 5, a plurality of concentric circles 6 having different diameters are spaced at predetermined intervals on the lens upper surface, that is, on a plane, with respect to the center 5. Disposed, a short focal length is formed compared to the concave lens.

When sunlight is incident on the Fresnel lens 120, the light is incident to the focal point positioned at a predetermined distance while passing through the Fresnel lens 120.

The heat collecting port 140 is located in the inner space of the concave reflector 110 under the Fresnel lens 120 without a support through connection with the heat pipe 130 as shown in FIG. 2. At this time, the inside of the heat collecting port 140 is inserted into one side portion of the heat pipe 130 as an empty space.

The heat collecting port 140 is located at a position where a focal point formed by the Fresnel lens 120 is formed so that the sunlight collected by the Fresnel lens 120 can be irradiated with as much as possible.

At this time, since the Fresnel lens 120 has a much shorter focal length than that of the concave lens having the same thickness, the distance between the Fresnel lens 120 and the heat collecting port 140, that is, the distance based on the focal length, is the concave lens. It is greatly reduced than when using.

Therefore, when irradiating sunlight to the heat collecting outlet 140 using the Fresnel lens 120, the installation space of the heat collecting outlet 140 is greatly reduced, the lens for condensing light to the heat collecting outlet 140 It can reduce the thickness and weight of the.

As such, when sunlight is primarily irradiated to the heat collecting outlet 140 by the Fresnel lens 120, the sunlight reflected by the concave reflector 110 positioned to surround the heat collecting outlet 140 is secondary to the heat collecting outlet 140. Is investigated. Therefore, the amount of sunlight incident toward the heat collecting unit 140 is further increased, so that the efficiency of the heat collecting unit 140 is greatly improved.

However, alternatively, the concave reflector 110 may be omitted, and in this case, the Fresnel lens 120 and the heat collecting hole 140 may be installed using a separate support.

The heat collecting port 140 has a material and a structure capable of maximally absorbing a heat source from sunlight and minimizing reflection of sunlight.

Therefore, the heat collecting hole 140 has an insertion groove into which the heat pipe 130 can be inserted, and a metal cube in which aluminum nitride is coated on an outer surface thereof, that is, a hexahedron in a closed shape except for a portion in which an insertion groove is formed. It has a shape.

The heat pipe 130 is a metal pipe made of a metal in which the inner space is enclosed. In the present example, the heat pipe 130 may have a cylindrical shape, but may not be limited thereto.

One side of the heat pipe 130 is inserted into one side of the adjacent heat collecting port 140, and as shown in FIG. 2, a part of one side of the heat pipe 130 is inserted into the heat collecting hole 140.

In addition, since the heat pipe 130 is inclined upward as it moves away from the heat collecting hole 140, the heat pipe 130 is inclined upward from the heat collecting hole 140 toward the heat sink 160.

The heat pipe 130 has a low boiling point and excellent heat transfer (ie, a heat transfer medium) HL1.

At this time, since the heat pipe 130 is inclined to descend toward the heat collecting hole 140, the heat HL1 embedded in the heat pipe 130 is inserted into the heat collecting hole 140 as illustrated in FIG. 2. In the side end portion of 130).

The fruit HL1 stored in the heat pipe 130 expands when subjected to heat to change from a liquid state to a vaporized state.

The heat exchange part 150 has a heat sink 160 into which a part of the heat pipe 160 is inserted.

The heat exchanger 150 is sealed except for a portion into which the heat pipe 130 and the first and second circulation pipes 171 and 172 are inserted, and the heat transfer liquid HL2 is filled in the internal space.

In this case, the heat transfer liquid HL2 may be water or oil.

The heat dissipation plate 160 located inside the heat exchange unit 150 dissipates heat, and as shown in FIG. 2, the heat pipe 130 penetrates the heat dissipation plate 160 in the longitudinal direction at the center thereof.

Therefore, the heat sink 160 is located on the outer surface of the heat pipe 130 penetrating itself, and dissipates heat from the heat pipe 130 toward the heat transfer liquid HL2 filled in the outside, that is, the heat exchange part 150. Let's do it.

The heat sink 160 is also positioned inside the heat exchanger 150 without a separate support by the support operation of the heat pipe 130.

The first and second circulation pipes 171 and 172 are connected between the other side surface of the heat exchanger 150 and the heat storage tank 180 to be spaced apart side by side in the longitudinal direction.

Therefore, the heat exchange part 150 and the heat storage tank 180 are connected with each other by these 1st and 2nd circulation pipes 171,172.

The first circulation pipe 171 located below the two circulation pipes 171 and 172 is a drain pipe for discharging the heat transfer liquid HL2 located in the heat pipe part 150 to the heat storage tank 180, and the second circulation pipe ( 172 is an inlet pipe for returning the heat transfer liquid HL2 whose heat is lost after being discharged to the heat storage tank 180 to the heat exchange unit 150 again.

Therefore, the heat transfer liquid HL2 of the heat exchange part 150 is circulated between the heat exchange part 150 and the heat storage tank 180 by the first and second circulation pipes 171 and 172.

The heat storage tank 180 stores a heat transfer liquid HL2 transferred from the heat exchanger 150 by the circulation operation of the heat transfer liquid HL2 and accumulates heat.

The operation of the solar thermal storage device 100 according to an embodiment having such a structure will be described.

First, the solar heat collected by the Fresnel lens 120 and the solar heat reflected by the concave reflector 110 are irradiated toward the heat collecting port 140 located between the Fresnel lens 120 and the concave reflector 110. The fissures 140 are heated by the light that is irradiated.

Due to the heating of the heat collecting hole 140, the fruit HL1 filled in the portion of the heat pipe 130 inserted into the heat collecting hole 140 is also heated, so that the fruit HL1 in the liquid state is vaporized to obtain gas. It turns into a state.

Accordingly, the vaporized fruit HL1 rises, and at this time, since the heat pipe 130 is installed to be inclined uphill toward the heat sink 160, the vaporized fruit HL1 is radiated along the heat pipe 130. The other end of the heat pipe 130 is moved.

The entire heat pipe 130 is heated by the movement of the fruit HL1, and heat is sheared through the heat pipe 130, which is also in contact with the heat sink 160 positioned to surround the outer surface of the heat pipe 130.

Thus, the heat sink 160 receives heat obtained by the heat collecting hole 140 through the heat pipe 130, and heat transmitted to the heat sink 160 is radiated to the outside of the heat sink 160 by the heat sink 160. do.

In this case, as described above, since the heat dissipation plate 160 is embedded in the heat exchange unit 150, heat emitted from the heat dissipation plate 160 is transferred to the heat transfer liquid HL2 filled in the heat exchange unit 150.

As such, the fruit HL1 vaporized by the heat of the heat collecting hole 140 and transferred to the heat transfer liquid HL2 of the heat exchange part 150 through the heat pipe 130 is liquefied again.

At this time, since the heat pipe 130 is inclined to descend from the heat sink 150 toward the heat collecting hole 140, the fruit HL1 changed into a liquid state flows down toward the heat collecting hole 140 along the heat pipe 130 to collect the heat collecting hole. It is accumulated in the side end part of the heat pipe 130 inserted in 140, and it becomes the vaporized state by the heat collecting hole 140 again.

Therefore, due to the vaporization state and the liquefaction state of the fruit HL1, the solar heat collected by the heat collecting port 140 is transferred to the heat transfer liquid HL2 of the heat exchange unit 150 as a result, and thus the heat transfer liquid HL2 Heating operation takes place.

The heat transfer liquid HL2 heated by the circulation operation of the fruit HL1 is transferred to the heat storage tank 180 through the first circulation pipe 171 and stored in the heat storage tank 180 to store heat.

The heat storage liquid 180 is equipped with a pump (not shown) inside the heat storage tank 180, and the heat transfer liquid HL2, which loses heat, is again obtained through the second circulation pipe 172 into the heat exchange unit 150 and vaporized again. By the heating operation to be made.

As such, the amount of heat stored in the heat storage tank 180 is increased by the circulation operation of the heat transfer liquid HL2 through the first and second circulation pipes 171 and 172.

In this example, these devices 130, 150 to prevent heat loss when heat is transferred to the heat pipe 130, heat exchanger 150, heat storage tank 180, first and second circulation pipes 171, 172. , 171, 172, 180 is insulated with a heat insulating material, such as to minimize the heat loss.

When storing the heat transferred to the heat exchanger 150 in the heat storage furnace 180, as shown in FIG. 6, heat transferred from the plurality of heat exchangers 150 may be simultaneously accumulated in one heat storage furnace 180. Therefore, the heat storage time can be shortened and the heat storage efficiency can be improved.

As described above, although the present invention has been described by way of limited embodiments, the present invention is not limited thereto, and the technical concept of the present invention and the following will be described by those skilled in the art to which the present invention pertains. Various modifications and variations will be possible within the scope of the appended claims.

Claims (6)

Fresnel lens for collecting and outputting incident light, A heat collecting port located under the Fresnel lens and irradiating incident light collected by the Fresnel lens; A heat pipe having a portion inserted into the heat collecting hole and filled with fruit that is changed from a liquid state into a gas state by the heat collected by the heat collecting hole, A heat sink mounted on an outer surface of a part of the heat pipe, for dissipating heat of the heat pipe heated by the fruit in the vaporized state to the outside; A heat exchanger in which the heat sink is embedded, and the heat transfer liquid heated by the heat dissipated by the heat sink is filled; A heat storage tank that receives and stores the heat transfer liquid heated in connection with the heat exchanger, and outputs the heat transfer liquid whose heat is lost to the heat exchanger. Solar heat storage device comprising a. In claim 1, The heat pipe is a solar heat storage device positioned inclined uphill toward the heat sink between the heat collecting port and the heat sink. In claim 1, And the heat collecting port is installed at a focal position of the Fresnel lens. In claim 1, And a first and a second circulation pipe connected between the heat exchange unit and the heat storage tank to circulate the heat transfer liquid between the heat exchange unit and the heat storage tank. In claim 1, The heat collecting device is a solar heat storage device is coated with aluminum nitride. In claim 1, And a concave reflector disposed under the heat collecting sphere to surround the heat collecting sphere and reflecting light passing through the Fresnel lens toward the heat collecting sphere.

Images