Low-temperature phase change heat storage device for heat supply

Abstract

The utility model discloses a low-temperature phase change heat storage device for heat supply. The low-temperature phase change heat storage device comprises a tube plate, a barrel body, a tube box and a plurality of heat exchange tubes, the two ends of each heat exchange tube are fixed to the tube plate, and the middle of each heat exchange tube is inserted into the barrel. The cylinder is filled with phase change materials, a medium inlet and a medium outlet are formed in the tube box, the medium inlet is communicated with one end of the heat exchange tube, the medium outlet is communicated with the other end of the heat exchange tube, and the device has the advantages of being even in heat energy distribution, good in heat transfer effect and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heat energy storage, and relates to a low-temperature phase change heat storage device for heat supply. BACKGROUND

[0002] In the process of heat energy utilization, the low-temperature phase change heat storage device can absorb or release a large amount of heat energy in the process of temperature change, and is widely used in the fields of heat supply, cooling, industrial production and the like. The core of this technology lies in the use of phase change materials (PCM). The phase change material can absorb or release a large amount of latent heat in the solid-liquid phase change process, and therefore has high heat energy storage and release capacity. However, the existing low-temperature phase change heat storage device has some deficiencies in structural design, which affects the heat energy conversion efficiency and service life.

[0003] The structural design also plays a crucial role in the performance of the low-temperature phase change heat storage device. The conventional phase change heat storage device adopts a simple container structure. Although this design has low manufacturing cost, it has obvious deficiencies in heat energy distribution and conduction. UTILITY MODEL CONTENT

[0004] The utility model discloses a low-temperature phase change heat storage device for heat supply, which has the characteristics of uniform heat energy distribution, good heat transfer effect and low cost.

[0005] To achieve the above object, the utility model discloses a low-temperature phase change heat storage device, including pipe plate, cylinder, pipe box and a plurality of heat exchange pipes, both ends of each heat exchange pipe are fixed on the pipe plate, and the middle part of each heat exchange pipe is inserted into the cylinder, the cylinder is filled with phase change material, and the pipe box is provided with a medium inlet and a medium outlet, wherein the medium inlet is communicated with one end of the heat exchange pipe, and the medium outlet is communicated with the other end of the heat exchange pipe.

[0006] The low-temperature phase change heat storage device is further improved in the utility model, and the further improvement lies in that:

[0007] Further, the opening of one end of the cylinder is sealed by a head, and the opening of the other end of the cylinder is closed by the pipe plate, and the pipe box is connected with the pipe plate.

[0008] Further, the inner wall of the cylinder is provided with a plurality of heat insulation layers.

[0009] Further, the head adopts a semispherical structure.

[0010] Further, a plurality of baffles are arranged in the cylinder, and each heat exchange pipe passes through each baffle.

[0011] Further, the baffle intersects with the heat exchange pipe.

[0012] Further, the bottom of the cylinder is provided with a support.

[0013] Further, the phase change material is paraffin or salt.

[0014] Further, the medium inlet and the medium outlet are provided with valves and temperature sensors.

[0015] Further, the cylinder is provided with a pressure gauge.

[0016] The utility model has the following beneficial effects:

[0017] The low-temperature phase change heat storage device for heat supply has the advantages that water enters from the medium inlet, exchanges heat with the phase change material in the cylinder through the heat exchange pipe, and the water cooled by heat exchange flows out from the medium outlet, the phase change material in the cylinder mainly stores heat through latent heat, and compared with sensible heat, latent heat has higher heat storage density, so that the phase change material can store more heat under the same volume, the heat storage capacity and efficiency of the heat storage device are improved, the cost is low, and the practicability is extremely high. BRIEF DESCRIPTION OF DRAWINGS

[0018] The description and drawings of the utility model constitute a part of the utility model and are used to provide further understanding on the utility model, the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0019] Figure 1 It is the structural diagram of the utility model.

[0020] 1 is a pipe box, 2 is a cylinder, 3 is a heat exchange pipe, 4 is a baffle, 5 is a support, and 6 is a phase change material. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] In the description of the utility model, it should be understood that the terms "include" and "contain" indicate the existence of the described features, the whole, the step, the operation, the element and / or the assembly, but do not exclude the existence or addition of one or more other features, the whole, the step, the operation, the element, the assembly and / or the set thereof.

[0023] It should also be understood that the terms used in the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0024] It should be further understood that the term "and / or" used in the present application and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations, for example, A and / or B can mean the existence of A alone, the existence of B alone, and the existence of both A and B. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0025] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range, without departing from the scope of the embodiments of the present application.

[0026] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting". Similarly, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted to mean "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)", depending on the context.

[0027] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These drawings are not drawn to scale, in which some details are exaggerated for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and the relative size and position relationship therebetween shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0029] It is known that a phase change material (PCM-Phase Change Material) is a substance that changes the state of matter at a constant temperature and can provide latent heat. The basic characteristics of the phase change material, the phase change process: the phase change material absorbs or releases a large amount of latent heat in the process of changing physical properties, which makes the phase change material have great application potential in the fields of energy saving, temperature control, etc. Temperature platform: although the temperature of the material remains unchanged, a large amount of latent heat is absorbed or released during the phase change process, forming a wide temperature platform.

[0030] Classification of phase change materials: inorganic phase change materials: mainly including crystalline hydrated salt, molten salt, metal or alloy, etc. This kind of material usually has high phase change latent heat and good thermal stability in the phase change process, but there may be problems such as supercooling and phase separation. Organic phase change materials: mainly including paraffin, acetic acid and other organic substances. Organic phase change materials usually have lower phase change temperature and better chemical stability, but the thermal conductivity is relatively poor. Composite phase change material: in order to overcome the shortcomings of single inorganic or organic phase change material, researchers have developed composite phase change material. This kind of material can not only effectively overcome the shortcomings of single material, but also can improve the application effect of phase change material and expand its application range.

[0031] Reference Figure 1 The low-temperature phase change heat storage device includes a tube plate, a tube box 1, a cylinder body 2, a head, heat exchange pipes 3, baffles 4 and supports 5. Both ends of each heat exchange pipe 3 are fixed on the tube plate, and the middle part of each heat exchange pipe 3 is inserted into the cylinder body 2.

[0032] As an embodiment of the present application, the cylinder body 2 is filled with a phase change material 6, the phase change material 6 is paraffin or salt, and a plurality of heat insulation layers are arranged on the inner wall of the cylinder body 2 to prevent heat loss.

[0033] As an embodiment of the present application, the opening at one end of the cylinder body 2 is sealed by the head, and the opening at the other end of the cylinder body 2 is closed by the tube plate, and the tube box 1 is connected with the tube plate.

[0034] As an embodiment of the present application, the head is designed in a semispherical shape, which can better withstand the internal pressure and prolong the service life of the device.

[0035] As an embodiment of the utility model, the heat exchange pipe 3 adopts double tube pass design, and the material of the heat exchange pipe 3 is selected as high-temperature-resistant metal, such as stainless steel.

[0036] As an embodiment of the utility model, a plurality of baffles 4 are arranged in the cylinder body 2, wherein each heat exchange pipe 3 passes through each baffle 4, and the baffle 4 intersects with the heat exchange pipe 3, so as to ensure that the phase change material 6 fully contacts the pipe wall of the heat exchange pipe 3 and improves the heat exchange efficiency.

[0037] As an embodiment of the utility model, the bottom of the cylinder body 2 is provided with a support 5 for supporting the entire device, and a thick-wall structure is adopted.

[0038] As an embodiment of the utility model, a medium inlet and a medium outlet are arranged on the pipe box 1, wherein the medium inlet is communicated with one end of the heat exchange pipe 3, the medium outlet is communicated with the other end of the heat exchange pipe 3, valves and temperature sensors are arranged at the medium inlet and the medium outlet, and a pressure gauge is arranged in the cylinder body 2.

[0039] The working process of the low-temperature phase change heat storage device is as follows:

[0040] In the heat storage process, high-temperature water enters from the medium inlet, exchanges heat with the phase change material 6 in the cylinder body 2 through the heat exchange pipe 3, the phase change material 6 absorbs heat and changes phase from solid to liquid, but the temperature remains unchanged before the phase change material 6 is completely melted. The low-temperature water cooled by heat exchange flows out from the medium outlet to realize heat transfer and storage.

[0041] In the heat release process, low-temperature water enters from the medium inlet, exchanges heat with the phase change material 6 in the cylinder body 2 through the heat exchange pipe 3, the phase change material 6 releases the stored heat and changes phase from liquid to solid, and the temperature remains unchanged before the phase change material 6 is completely solidified. The high-temperature water after heat absorption flows out from the medium outlet to realize heat release and utilization.

[0042] It should be noted that the phase change material 6 in the cylinder body 2 mainly stores heat through latent heat, and the latent heat has higher heat storage density compared with sensible heat. Therefore, under the same volume, the phase change material 6 can store more heat, improving the heat storage capacity and efficiency of the heat storage device. In addition, the thermal conductivity of the phase change material 6 has an important influence on heat transfer. In order to improve the thermal conductivity, a thermal conductivity enhancer, such as graphite or metal particles, can be added to the phase change material 6, so that heat can be conducted more quickly and uniformly.

[0043] The low-temperature phase change heat storage device has simple structure, low manufacturing cost, high heat exchange efficiency, can store and release a large amount of heat energy in a short time, and has long service life.

[0044] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the general inventive concepts described and that the claims be interpreted not only in view of the description but also in view of the specification. The specification and examples are to be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.

[0045] It is to be understood that the application is not limited to the specific structures described herein and shown in the drawings, but includes any and all variations falling within the scope of the application. The scope of the application is limited only by the claims that follow.

[0046] The above is only the preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent structure change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A low-temperature phase change heat storage device, characterized by comprising: The heat exchanger comprises a tube sheet, a cylinder (2), a tube box (1) and a plurality of heat exchange tubes (3); both ends of each heat exchange tube (3) are fixed on the tube sheet, and the middle part of each heat exchange tube (3) is inserted into the cylinder (2); the cylinder (2) is filled with a phase change material (6), and the tube box (1) is provided with a medium inlet and a medium outlet, wherein the medium inlet is communicated with one end of the heat exchange tube (3), and the medium outlet is communicated with the other end of the heat exchange tube (3).

2. The low temperature phase change thermal storage device of claim 1, wherein The opening at one end of the cylinder (2) is sealed by a head, and the opening at the other end of the cylinder (2) is closed by the tube sheet, and the tube box (1) is connected with the tube sheet.

3. The low temperature phase change thermal storage device of claim 1, wherein A plurality of heat insulation layers are arranged on the inner wall of the cylinder (2).

4. The low temperature phase change thermal storage device of claim 2, wherein The head adopts a semi-spherical structure.

5. The cryogenic phase-change thermal storage device of claim 1, wherein, A plurality of baffles (4) are arranged in the cylinder (2), wherein each heat exchange tube (3) passes through each baffle (4).

6. The cryogenic phase-change thermal storage device of claim 5, wherein, The baffle (4) intersects with the heat exchange tube (3).

7. The cryogenic phase-change thermal storage device of claim 1, wherein, The bottom of the cylinder (2) is provided with a support (5).

8. The cryogenic phase-change thermal storage device of claim 1, wherein, The phase change material (6) is paraffin or salt.

9. The cryogenic phase-change thermal storage device of claim 1, wherein, Valves and temperature sensors are arranged at the medium inlet and the medium outlet.

10. The cryogenic phase-change thermal storage device of claim 1, wherein, A pressure gauge is arranged in the cylinder (2).

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