KR20240065884A - Latent heat storage device and latent heat storage system - Google Patents

Abstract

A first structure including an interior space, and a plurality of second structures disposed in a portion of the interior space and filled with a phase change material, wherein the second structure is located in a remaining portion of the interior space. A latent heat storage device that absorbs or releases latent heat through heat exchange with a flowing working fluid is disclosed. In addition to this, various embodiments identified through this document are possible.

Description

Latent heat storage device and latent heat storage system {LATENT HEAT STORAGE DEVICE AND LATENT HEAT STORAGE SYSTEM}

Embodiments disclosed in this document relate to a latent heat storage device and a latent heat storage system, and particularly to a latent heat storage device including a can filled with a phase change material and a latent heat storage system using the same.

Solar energy is an infinite energy source and a renewable energy that can solve problems arising from the use of unsustainable energy based on fossil fuels and nuclear energy and solve environmental problems. However, since solar power has limitations in that it is intermittent and limited, the development of technologies for efficient energy storage and utilization is actively underway to utilize solar power. Among them, thermal energy storage methods using latent heat are widely used.

Thermal energy storage method using latent heat is a method of storing and releasing heat using the latent heat energy required during the phase change process of the phase change material. Depending on the type of heat storage tank and the storage type of the phase change material, it is a shell and tube type. and capsule types. The shell and tube type contains a phase change material in a heat storage tank, and a coil for heat exchange is inserted to exchange heat with a heat exchange fluid flowing inside the coil. The capsule type is a type in which a phase change material is surrounded by a capsule and a heat exchange fluid flows on the outside to exchange heat.

The capsule type is a form of phase change material storage that allows effective heat exchange by expanding the heat exchange area, and has relatively fewer dead zones than the shell and tube type, making it suitable for large heat exchange tanks.

When designing a capsule-type phase change material storage form, the shell-to-core ratio can be an important factor. However, the conventional capsule type inevitably had limitations in utilizing the space of the heat storage tank (e.g., tank) to the maximum due to the structure of the capsule. Moreover, in the conventional capsule type, damage (e.g. cracks, dents, etc.) of the capsule may occur due to pressure drop as the flow rate of the heat exchange fluid flowing to the outside increases.

Accordingly, various embodiments disclosed in this document can provide a latent heat storage device and a latent heat storage system that maximizes the space of the heat storage tank and prevents damage to the capsule in response to an increase in the flow rate of the heat exchange fluid.

According to one embodiment, the latent heat storage device includes a first structure including an internal space, and a plurality of second structures disposed in a portion of the internal space and filled with a phase change material, 2 The structure may absorb latent heat or release the latent heat through heat exchange with a working fluid flowing in the remaining part of the internal space.

According to one embodiment, the plurality of second structures are divided into a plurality of groups according to a designated number, and each of the plurality of groups may be aligned in a designated direction within the internal space.

According to one embodiment, each of the plurality of second structures may be made of aluminum or stainless steel.

According to one embodiment, each of the plurality of second structures may have a cylindrical shape.

According to one embodiment, the phase change material may include at least one of tetradecane, octadecane, and nonadecane.

According to one embodiment, the phase change material may be filled in the second structure at a specified ratio.

According to one embodiment, the working fluid flows from the outside of the first structure into the inner space through a first path, and flows from the inner space to the outside of the first structure through a second path different from the first path. It can be discharged through .

According to one embodiment, the latent heat storage system includes a collector that absorbs sunlight and converts it into heat energy, and then transfers the converted heat energy to a working fluid; a pump that transfers the working fluid that has received the heat energy; and a latent heat storage device operatively connected to the pump, the latent heat storage device comprising: a first structure comprising an interior space; and a plurality of structures disposed in a portion of the interior space and filled with a phase change material. of second structures, wherein the second structure may absorb latent heat or release the latent heat through heat exchange with the working fluid flowing in the remaining part of the internal space.

According to one embodiment, the plurality of second structures are divided into a plurality of groups according to a designated number, and each of the plurality of groups may be aligned in a designated direction within the internal space.

According to one embodiment, each of the plurality of second structures may be made of aluminum or stainless steel.

According to one embodiment, each of the plurality of second structures may have a cylindrical shape.

According to one embodiment, the phase change material may include at least one of tetradecane, octadecane, and nonadecane.

According to one embodiment, the phase change material may be filled in the second structure at a specified ratio.

According to one embodiment, the working fluid may be introduced from the pump into the internal space through a first path, and may be discharged from the internal space to the pump through a second path different from the first path.

The latent heat storage device and latent heat storage system according to various embodiments disclosed in this document can maximize the space of the heat storage tank, prevent damage to the capsule in response to an increase in the flow rate of the heat exchange fluid, and increase heat transfer efficiency at the same time. .

In addition, various effects that can be directly or indirectly identified through this document may be provided.

1 is a perspective view of a latent heat storage device according to an embodiment.
Figure 2a is a side view of a latent heat storage device according to an embodiment.
Figure 2b is a view from above of a latent heat storage device according to an embodiment.
Figure 3 is a diagram illustrating a latent heat absorption process of a latent heat storage device according to an embodiment.
Figure 4 is a diagram illustrating a latent heat release process of a latent heat storage device according to an embodiment.
Figure 5 is a graph showing the results of a heat storage experiment of the first structure in the latent heat storage device according to one embodiment.
Figure 6 is a graph showing the results of a heat dissipation test of the first structure in the latent heat storage device according to one embodiment.
Figure 7 is a block diagram schematically showing components of a latent heat storage system according to an embodiment.
In relation to the description of the drawings, identical or corresponding components may be assigned the same reference number.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. These embodiments only serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims. Hereinafter, like reference numerals refer to like elements.

Although first, second, etc. are used to describe various elements, elements and/or sections, it is understood that these elements, elements and/or sections are not limited by these terms. These terms are merely used to distinguish one element, component or section from other elements, elements or sections. Accordingly, it goes without saying that the first element, first element, or first section mentioned below may also be a second element, second element, or second section within the technical spirit of the present invention.

The terms used in this specification are for describing embodiments and are not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “made of” refers to a referenced component, step, operation and/or element of one or more other components, steps, operations and/or elements. Does not exclude presence or addition.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, the configuration of the present invention will be described in detail with reference to the attached drawings.

1 is a perspective view of a latent heat storage device according to an embodiment. Figure 2a is a side view of a latent heat storage device according to an embodiment. Figure 2b is a view from above of a latent heat storage device according to an embodiment.

Referring to FIGS. 1, 2A, and 2B, the latent heat storage device 100 according to an embodiment may perform a heat storage or heat dissipation operation through heat exchange between a phase change material and a working fluid (F). To this end, the latent heat storage device 100 may include a first structure 210 and a plurality of second structures 220.

According to one embodiment, the first structure 210 may have a cylindrical shape including an internal space. For example, the first structure 210 has a length of 1,400 mm in a first direction (e.g., +z-axis direction) and 600 mm in a second direction perpendicular to the first direction (e.g., +y-axis direction). You can have In one embodiment, the first structure 210 may be a tank-shaped heat storage tank. In one embodiment, a plurality of second structures 220 and a working fluid F may be disposed in the internal space of the first structure 210. For example, a plurality of second structures 220 are arranged in a designated arrangement in a portion of the internal space of the first structure 210, and the plurality of second structures 220 are arranged in a remaining portion of the interior space. It can be filled with a working fluid (F) that is in contact with the surface of. In one embodiment, the outside of the first structure 210 is surrounded by an insulating material (e.g., a 50 mm thick glass wool insulation material), thereby reducing heat loss inside the first structure 210.

According to one embodiment, each of the plurality of second structures 220 may have a cylindrical shape. For example, each of the plurality of second structures 220 may be a cylindrical can structure having a length of 168 mm in the first direction and 66 mm in the second direction. In one embodiment, each of the plurality of second structures 220 corresponds to the shape of the first structure 210 by the above structure, so that each of the plurality of second structures 220 can be loaded inside the first structure 210 at maximum capacity. In one embodiment, each of the plurality of second structures 220 may be made of aluminum or stainless steel with a specified rigidity. This material can prevent damage to the capsule in response to an increase in the flow rate of the working fluid (F).

According to one embodiment, the plurality of second structures 220 may be arranged according to a designated arrangement within the internal space of the first structure 210. For example, the first group 220a including some of the plurality of second structures 220 may be formed on the first plane of the internal space of the first structure 210 (e.g., between the -x axis and -y axis). The second group 220b, which is aligned in the first direction at one point on the plane and includes another part of the plurality of structures 220, is aligned on the second plane (e.g., plane) of the internal space of the first structure 210. : a plane between the -x axis and the +y axis) can be aligned in the first direction at one point. According to this arrangement structure, the plurality of second structures 220 may be stacked at different points on each plane according to divided groups. Additionally, in the internal space of the first structure 210, the working fluid F may flow between the plurality of second structures 220.

According to one embodiment, each of the plurality of second structures 220 may be filled with a phase change material at a specified ratio (eg, 99%). For example, each of the plurality of second structures 220 may be filled with at least one of tetradecane, octadecane, and nonadecane. Here, the phase change material may absorb latent heat or release the latent heat through heat exchange with the working fluid (F).

Figure 3 is a diagram illustrating a latent heat absorption process of a latent heat storage device according to an embodiment.

Referring to FIG. 3, the latent heat storage device 100 according to an embodiment includes a first circulation operation 300a for absorbing latent heat according to the flow of the working fluid F and a first phase change graph 300b related thereto. It can be expressed.

Referring to the first circulation operation 300a and the first phase change graph 300b related thereto, the inside of the first structure 210 is from the outside of the latent heat storage device (e.g., pump) through the first path R1. A working fluid (F) of a first temperature may be introduced. The first path R1 may be a path from a pipe connected to one side of the first structure 210 to the internal space of the first structure 210. The working fluid (F) of the first temperature introduced into the interior of the first structure 210 through the first path (R1) is circulated inside the first structure 210 and surfaces of the plurality of second structures 220. can be contacted. During the contact process (e.g., heat exchange process), the phase change materials filled inside each of the plurality of second structures 220 are in a first state (e.g., solid state) corresponding to the first section S1. It changes from the second state (e.g., phase change state) corresponding to the second section (S2) to the third state (e.g., liquid state) corresponding to the third section (S3) and can absorb latent heat. After the contact process, the working fluid (F) of the first temperature flowing into the interior of the first structure 210 through the first path (R1) has a second temperature (e.g., a temperature lower than the first temperature). In this state, it can be discharged through the second path (R2). The second path R2 may be a path from the internal space of the first structure 210 to another pipe connected to the other side of the first structure 210.

By the above-described first circulation operation 300a, the latent heat storage device 100 can perform a heat storage function of storing heat energy.

Figure 4 is a diagram illustrating a latent heat release process of a latent heat storage device according to an embodiment.

Referring to FIG. 4, the latent heat storage device 100 according to an embodiment includes a second circulation operation 400a that releases latent heat according to the flow of the working fluid F and a second phase change graph 400b related thereto. It can be expressed.

Referring to the second circulation operation 400a and the second phase change graph 400b related thereto, the inside of the first structure 210 is from the outside of the latent heat storage device (e.g., pump) through the third path R3. A working fluid (F) of a third temperature may be introduced. The third path R3 may be a path from a pipe connected to the other side of the first structure 210 to the internal space of the first structure 210. The working fluid (F) of the third temperature flowing into the inside of the first structure 210 through the third path (R3) is circulated inside the first structure 210 and surfaces of the plurality of second structures 220. can be contacted. During the contact process (e.g., heat exchange process), the phase change materials filled inside each of the plurality of second structures 220 are in a first state (e.g., liquid state) corresponding to the first section S1. It changes from the second state (e.g., phase change state) corresponding to the second section S2 to the third state (e.g., solid state) corresponding to the third section S3, and latent heat can be released. After the contact process, the working fluid (F) of the third temperature flowing into the interior of the first structure 210 through the third path (R3) has a third temperature (e.g., a temperature higher than the first temperature). In this state, it can be discharged through the fourth route (R4). The second path R2 may be a path from the internal space of the first structure 210 to another pipe connected to one side of the first structure 210.

By the above-described second circulation operation 400a, the latent heat storage device 100 can perform a heat dissipation function of emitting heat energy.

Figure 5 is a graph showing the results of a heat storage experiment of the first structure in the latent heat storage device according to one embodiment.

Referring to the graph 500 of FIG. 5, the latent heat storage device 100 according to an embodiment may indicate different phase change completion times in each section at different temperatures. For example, when the temperature of the working fluid (F) flowing in the internal space is a first temperature (e.g., 80° C.), the latent heat storage device 100 stores the first temperature when the first time (e.g., about 70 minutes) has elapsed. 2 The phase change of the phase change material inside the structure 220 can be completed. As another example, when the temperature of the working fluid (F) flowing in the internal space is a second temperature (e.g., 70° C.) lower than the first temperature, the latent heat storage device 100 operates for a second time (e.g., longer than the first time). : When about 150 minutes) has elapsed, the phase change of the phase change material inside the second structure 220 can be completed. As another example, when the temperature of the working fluid (F) flowing in the internal space is a third temperature (e.g., 60° C.) lower than the second temperature, the latent heat storage device 100 operates for a third time (e.g., 60° C.) that is longer than the second time. Example: When approximately 280 minutes) has elapsed, the phase change of the phase change material inside the second structure 220 may be completed. Through these experimental results, the heat storage effect of the latent heat storage device 100 can be confirmed.

Figure 6 is a graph showing the results of a heat dissipation test of the first structure in the latent heat storage device according to one embodiment.

Referring to the graph 600 of FIG. 6, the latent heat storage device 100 according to an embodiment may indicate the phase change completion time at a specified temperature. For example, when the temperature of the working fluid (F) flowing in the internal space is maintained at a specified temperature (e.g., 5°C), the latent heat storage device 100 is operated when a certain period of time (e.g., about 150 minutes) has elapsed. 2 The phase change of the phase change material inside the structure 220 can be completed. Through these experimental results, the heat dissipation effect of the latent heat storage device 100 can be confirmed.

Figure 7 is a block diagram schematically showing components of a latent heat storage system according to an embodiment.

Referring to FIG. 7 , the latent heat storage system 700 according to an embodiment may perform a heat storage or heat dissipation operation through heat exchange between the phase change material and the working fluid (F). To this end, the latent heat storage system 700 may include a collector 710, a pump 720, and a latent heat storage device 730. In various embodiments, the latent heat storage system 700 may omit at least one of the above-described components or may further include at least one other component. For example, the latent heat storage system 700 may further include a pipe connecting the latent heat storage device 730 and the pump 720.

According to one embodiment, the collector 710 may absorb sunlight, convert it into heat energy, and then transfer the converted heat energy to the working fluid (F). The collector 710 may be, for example, a solar thermal collector.

According to one embodiment, the pump 720 may circulate the working fluid F, which has received heat energy by the collector 710, to the latent heat storage device 730. For example, the pump 720 may circulate the working fluid F that has received heat energy into the internal space of the latent heat storage device 730 using pressure.

According to one embodiment, the latent heat storage device 730 may include a first structure 210 and a plurality of second structures 220.

According to one embodiment, the first structure 210 may have a cylindrical shape including an internal space. For example, the first structure 210 has a length of 1,400 mm in a first direction (e.g., +z-axis direction) and 600 mm in a second direction perpendicular to the first direction (e.g., +y-axis direction). You can have In one embodiment, the first structure 210 may be a tank-shaped heat storage tank. In one embodiment, a plurality of second structures 220 and a working fluid F may be disposed in the internal space of the first structure 210. For example, a plurality of second structures 220 are arranged in a designated arrangement in a portion of the internal space of the first structure 210, and the plurality of second structures 220 are arranged in a remaining portion of the interior space. It can be filled with a working fluid (F) that is in contact with the surface of. In one embodiment, the outside of the first structure 210 is surrounded by an insulating material (e.g., a 50 mm thick glass wool insulation material), thereby reducing heat loss inside the first structure 210.

According to one embodiment, each of the plurality of second structures 220 may have a cylindrical shape. For example, each of the plurality of second structures 220 may be a cylindrical can structure having a length of 168 mm in the first direction and 66 mm in the second direction. In one embodiment, each of the plurality of second structures 220 corresponds to the shape of the first structure 210 by the above structure, so that each of the plurality of second structures 220 can be loaded inside the first structure 210 at maximum capacity. In one embodiment, each of the plurality of second structures 220 may be made of aluminum or stainless steel with a specified rigidity.

According to one embodiment, the plurality of second structures 220 may be arranged according to a designated arrangement within the internal space of the first structure 210. For example, the first group 220a including some of the plurality of second structures 220 may be formed on the first plane of the internal space of the first structure 210 (e.g., between the -x axis and -y axis). The second group 220b, which is aligned in the first direction at one point on the plane and includes another part of the plurality of structures 220, is aligned on the second plane (e.g., plane) of the internal space of the first structure 210. : a plane between the -x axis and the +y axis) can be aligned in the first direction at one point. According to this arrangement structure, the plurality of second structures 220 may be stacked at different points on each plane according to divided groups. Additionally, in the internal space of the first structure 210, the working fluid F may flow between the plurality of second structures 220.

According to one embodiment, each of the plurality of second structures 220 may be filled with a phase change material at a specified ratio (eg, 99%). For example, each of the plurality of second structures 220 may be filled with at least one of tetradecane, octadecane, and nonadecane. Here, the phase change material may absorb latent heat or release the latent heat through heat exchange with the working fluid (F).

In relation to the description of the drawings, identical or corresponding components may be assigned the same reference number.

As described above, the present invention is described with reference to the illustrated embodiments, but these are merely illustrative examples, and those of ordinary skill in the art to which the present invention pertains can make various modifications without departing from the gist and scope of the present invention. It will be apparent that various other variations, modifications and equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached claims.

100: Latent heat storage device
210: first structure
220: second structure
F: Working fluid
700: Latent heat storage system
710: collector
720: pump
730: Latent heat storage device

Claims (14)

In the latent heat storage device,
A first structure including an interior space; and
a plurality of second structures disposed in a portion of the internal space and filled with a phase change material;
The second structure is a latent heat storage device that absorbs latent heat or releases the latent heat through heat exchange with a working fluid flowing in the remaining part of the internal space. In claim 1,
The plurality of second structures are divided into a plurality of groups according to a designated number,
A latent heat storage device, wherein each of the plurality of groups is aligned in a designated direction within the internal space. In claim 1,
A latent heat storage device, wherein each of the plurality of second structures is made of aluminum or stainless steel. In claim 1,
A latent heat storage device, wherein each of the plurality of second structures has a cylindrical shape. In claim 1,
The phase change material includes at least one of tetradecane, octadecane, and nonadecane. In claim 1,
The phase change material is filled in the second structure in a specified ratio. In claim 1,
The working fluid is latent heat, which flows into the interior space from the outside of the first structure through a first path and is discharged from the interior space to the outside of the first structure through a second path different from the first path. storage device. In the latent heat storage system,
A collector that absorbs sunlight, converts it into heat energy, and then transfers the converted heat energy to a working fluid;
a pump that transfers the working fluid that has received the heat energy; and
a latent heat storage device operatively connected to the pump,
The latent heat storage device,
A first structure including an interior space; and
A plurality of second structures disposed in a portion of the internal space and filled with a phase change material,
The second structure absorbs latent heat or releases latent heat through heat exchange with the working fluid flowing in the remaining part of the internal space. In claim 8,
The plurality of second structures are divided into a plurality of groups according to a designated number,
A latent heat storage system, wherein each of the plurality of groups is aligned in a designated direction within the internal space. In claim 8,
A latent heat storage system, wherein each of the plurality of second structures is made of aluminum or stainless steel. In claim 8,
A latent heat storage system, wherein each of the plurality of second structures has a cylindrical shape. In claim 8,
The phase change material includes at least one of tetradecane, octadecane, and nonadecane. In claim 8,
The latent heat storage system of claim 1, wherein the phase change material is filled in the second structure in a specified ratio. In claim 8,
The working fluid is introduced from the pump into the internal space through a first path, and is discharged from the internal space to the pump through a second path different from the first path.

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