Soil air heat exchanger and air conditioner air inlet pipe structure thereof

Abstract

The utility model discloses a soil air heat exchanger, which comprises a pipe body and phase-change material heat storage structures arranged in the pipe body, and is characterized in that the phase-change material heat storage structures are arranged in the pipe body in a sleeving manner at intervals. The utility model further discloses an air conditioner air inlet pipe structure which comprises an air inlet pipe buried in soil below the earth surface, and is characterized in that the part, located in the soil, of the air inlet pipe is provided with at least one section composed of the soil air heat exchanger. The soil-air heat exchanger has the advantages that the structure is simple, construction is convenient and fast, the utilization efficiency of a house air conditioner fresh air system on natural energy is greatly improved, the market application range of the soil-air heat exchanger is widened, and the economic cost of the soil-air heat exchanger is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building ventilation control, in particular to a soil air heat exchanger and an air conditioning air inlet pipe structure thereof. Background Art

[0002] Accelerating the development of renewable energy and implementing renewable energy substitution actions are the key to the development of renewable energy in my country. In hotter areas, there is usually a temperature difference of several degrees or even dozens of degrees in the underground soil and the air above the ground, forming a large temperature difference energy, which is a sustainable and renewable clean energy. This temperature difference energy can usually rely on the buried air intake duct to form a tunnel wind system, and rely on the incoming air for heat exchange to achieve utilization. For example, CN201911099341.8 discloses a Trombe wall based on energy storage and a soil-air heat exchange system energy complementary passive house, CN202311701659.5 discloses a soil-air heat exchanger and a solar air collector coupled fresh air system, and CN201922004306.5 discloses a "zero energy consumption" shallow soil-air heat exchange system, etc., all of which belong to this energy utilization method.

[0003] However, due to the large fluctuations in the day and night temperature of outdoor air in summer, a large amount of natural energy is contained in the day and night changes of outdoor air. It is difficult for ordinary underground wind systems to fully utilize this part of natural energy in a daily cycle due to the low thermal conductivity and specific heat of the surrounding soil. Therefore, in recent years, a technology has emerged to increase the energy storage of phase change materials in underground air intake ducts, namely the phase change material-soil-air heat exchanger (PCM-EAHE) technology. As a renewable energy and energy-saving technology for the development and utilization of shallow geothermal energy, this technology has become an effective technical measure for the development and utilization of shallow geothermal energy.

[0004] The existing phase change material-soil-air heat exchanger device has a simple structure. Generally, a phase change material layer is directly added in the ventilation duct to store and release heat. The heat storage and release amount is small, the heat exchange efficiency is low, and the amount of fresh air processed is small, which is difficult to adapt to the scene with large demand for fresh air. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide a soil air heat exchanger and its air conditioning air inlet pipe structure with better heat storage and release effect and efficiency, so that it can use as little phase change material as possible and as short a buried pipeline length as possible to fully utilize the natural energy contained in the outdoor air.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A soil-air heat exchanger comprises a pipe body and a phase change material heat storage structure arranged in the pipe body, wherein the phase change material heat storage structure is a plurality of layers arranged in intervals in the pipe body.

[0008] In this way, the multi-layer phase change material heat storage structure of this solution increases the heat exchange area between the phase change material and the air, and improves the heat exchange processing efficiency and effect of heat storage and release. Under the condition of the same ventilation wind speed, the filling amount of the phase change material can be reduced. And under the condition of the same length of the buried pipeline, a larger amount of fresh air can be processed.

[0009] Furthermore, the phase change material heat storage structure is a multi-layer structure coaxially arranged with the tube body.

[0010] In this way, the coaxial arrangement of each layer structure is more convenient for manufacturing.

[0011] Furthermore, the innermost layer of the phase change material heat storage structure is a solid column, and the remaining layers are hollow rings.

[0012] In this way, the innermost layer is a solid columnar structure that can accommodate more phase change materials and improve the heat storage and release treatment effect.

[0013] As an optional method, each layer of the phase change material heat storage structure includes a phase change material located inside and a supporting shell located outside. In implementation, the supporting shell can be made of solid materials with good thermal conductivity such as metal materials or ceramic materials.

[0014] As another optional manner, each layer of the phase change material heat storage structure is made of a shaped phase change material.

[0015] This makes manufacturing more convenient and the cost is lower. Shape-fixed phase change material is a new type of phase change solid material that uses some microstructure encapsulation solid-liquid mechanism phase change materials to achieve shape fixing. It belongs to the existing technology and is usually based on porous media. The phase change material is distributed in the three-dimensional mesh structure of the porous medium to achieve fixing, which can avoid excessive deformation or liquid leakage before and after the material phase change.

[0016] Furthermore, the thickness of each layer of the phase change material heat storage structure and the interval width between adjacent layers of the phase change material heat storage structure are equal, so as to better ensure the heat exchange effect of the phase change material.

[0017] Furthermore, a supporting connection frame is provided between each layer of the phase change material heat storage structure.

[0018] In this way, the relative positions between the layers of phase change material heat storage structures can be better guaranteed.

[0019] Furthermore, the support connecting frame includes a long strip connecting rod located in the middle and connecting legs fixed at both ends of the connecting rod in a U-shape with an opening facing outward, and the outer ends of the connecting legs are connected to the corresponding layers of phase change material heat storage structures.

[0020] The supporting connection frame of such a structure not only has a more stable and reliable structural support, but also can well absorb the deformation of the phase change material before and after the phase change, and better ensure the stability of the overall structure. When implemented, the connecting legs can be multiple evenly arranged along the circumference (more suitable for small ventilation ducts to improve structural reliability), or two on the upper left and right sides (more suitable for large ventilation ducts to reduce structural costs).

[0021] Furthermore, the pipe body is a metal pipe, which can better transfer heat to the soil. Furthermore, a layer of phase change material is encapsulated inside the material of the pipe body, which can better store and release heat.

[0022] The present invention also discloses an air-conditioning air inlet pipe structure, comprising an air inlet pipe buried in the soil below the ground surface, characterized in that the portion of the air inlet pipe located in the soil has at least one section constituted by the above-mentioned soil-air heat exchanger.

[0023] In this way, after the soil air heat exchanger is installed in the air inlet duct of the air conditioner, the heat absorbed and stored from the outdoor air during the day can be fully released at night, or the cold absorbed and stored from the outdoor air at night can be fully released during the day, giving full play to the regulation of the outdoor air by the underground wind system under the daily cycle air temperature fluctuation, and stabilizing the outlet air temperature within the phase change temperature range. Therefore, its limitations can be alleviated in the use scenario with a large demand for fresh air, reducing the initial investment of the system, and the cooling effect is better, realizing the sustainable and coordinated development of energy, environment and economy.

[0024] Therefore, the utility model has the advantages of simple structure, convenient construction, greatly improving the utilization efficiency of natural energy by the house air-conditioning fresh air system, expanding the market application scope of the soil-air heat exchanger, and reducing its economic cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the end structure of the air inlet duct structure of the air conditioner in a specific implementation manner.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the air inlet duct structure of the air conditioner in a specific implementation manner. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Specific implementation method: see Figure 1-2 As shown, a soil-air heat exchanger comprises a pipe body 5 and a phase change material heat storage structure arranged in the pipe body, wherein the phase change material heat storage structure is a multi-layer structure which is spaced apart and sleeved in the pipe body 5.

[0029] In this way, the multi-layer phase change material heat storage structure of this solution increases the heat exchange area between the phase change material and the air, and improves the heat exchange processing efficiency and effect of heat storage and release. Under the condition of the same ventilation wind speed, the filling amount of the phase change material can be reduced. And under the condition of the same length of the buried pipeline, a larger amount of fresh air can be processed.

[0030] Specifically, the phase change material heat storage structure comprises a cylindrical innermost layer 1 and a second layer 2, a third layer 3, and a fourth layer 4 which are sequentially arranged outside the innermost layer 1. In the figure, reference numeral 6 represents soil.

[0031] In this way, the coaxial arrangement of each layer structure is more convenient for manufacturing.

[0032] Among them, the innermost layer of the phase change material heat storage structure is a solid column, and the remaining layers are hollow rings.

[0033] In this way, the innermost layer is a solid columnar structure that can accommodate more phase change materials and improve the heat storage and release treatment effect.

[0034] As an optional method, each layer of the phase change material heat storage structure includes a phase change material located inside and a supporting shell located outside. When implemented, the supporting shell can be implemented by a solid material with good thermal conductivity such as a metal material or a ceramic material. When implemented, the phase change material encapsulated inside can be a common phase change material or the following shaped phase change material. The use of shaped phase change material encapsulation to form each layer of the phase change material heat storage structure can better protect the phase change material and have a higher overall thermal conductivity.

[0035] As another optional manner, each layer of the phase change material heat storage structure is made of a shaped phase change material.

[0036] In this way, the use of fixed-shape phase change materials alone does not require packaging, making its manufacturing more convenient and cost-effective. Fixed-shape phase change materials are a new type of phase change solid material that uses some microstructure encapsulation solid-liquid mechanism phase change materials to achieve fixed shape. They belong to the existing technology and are usually based on porous media. The phase change material is distributed in the three-dimensional mesh structure of the porous medium to achieve fixed shape, which can avoid excessive deformation or liquid leakage before and after the material phase change.

[0037] The thickness of each layer of the phase change material heat storage structure and the interval width between adjacent layers of the phase change material heat storage structure are equal, so as to better ensure the heat exchange effect of the phase change material.

[0038] Among them, a supporting connection frame is arranged between each layer of phase change material heat storage structure.

[0039] In this way, the relative positions between the layers of phase change material heat storage structures can be better guaranteed.

[0040] The supporting connecting frame includes a long connecting rod 8 in the middle and connecting legs 7 fixed at both ends of the connecting rod in a U-shape with an opening facing outwards. The outer ends of the connecting legs 7 are connected to the corresponding layers of the phase change material heat storage structure.

[0041] The supporting connection frame of such a structure not only has a more stable and reliable structural support, but also can well absorb the deformation of the phase change material before and after the phase change, and better ensure the stability of the overall structure. When implemented, the connecting legs can be multiple evenly arranged along the circumference (more suitable for small ventilation ducts to improve structural reliability), or two on the upper left and right sides (more suitable for large ventilation ducts to reduce structural costs).

[0042] The pipe body 4 is a metal pipe, which can better transfer heat to the soil.

[0043] During implementation, a layer of phase change material is also encapsulated inside the material of the tube body itself, and constitutes the fourth layer 4 of the phase change material heat storage structure. This can better store and release heat.

[0044] The present invention also discloses an air-conditioning air inlet pipe structure, including an air inlet pipe buried in the soil 6 below the ground surface, characterized in that the portion of the air inlet pipe located in the soil 6 has at least one section constituted by the above-mentioned soil-air heat exchanger.

[0045] In this way, after the soil air heat exchanger is installed in the air inlet duct of the air conditioner, the heat absorbed and stored from the outdoor air during the day can be fully released at night, or the cold absorbed and stored from the outdoor air at night can be fully released during the day, giving full play to the regulation of the outdoor air by the underground wind system under the daily cycle air temperature fluctuation, and stabilizing the outlet air temperature within the phase change temperature range. Therefore, its limitations can be alleviated in the use scenario with a large demand for fresh air, reducing the initial investment of the system, and the cooling effect is better, realizing the sustainable and coordinated development of energy, environment and economy.

Claims

1. A soil-air heat exchanger, comprising a tube body and a phase change material heat storage structure arranged in the tube body, characterized in that: The phase change material heat storage structure is a multi-layer structure spaced apart and sleeved in the tube body; The phase change material heat storage structure is a multi-layer structure coaxially arranged with the tube body; The innermost layer of the phase change material heat storage structure is a solid column, and the remaining layers are hollow rings; A supporting connection frame is arranged between each layer of the phase change material heat storage structure.

2. The soil-air heat exchanger according to claim 1, characterized in that: Each layer of the phase change material heat storage structure includes a phase change material located inside and a supporting shell located outside.

3. The soil-air heat exchanger according to claim 1, characterized in that: Each layer of phase change material heat storage structure is made of shaped phase change material.

4. The soil-air heat exchanger according to claim 1, characterized in that: The thickness of each layer of phase change material heat storage structure is equal to the interval width between adjacent layers of phase change material heat storage structure.

5. The soil-air heat exchanger according to claim 1, characterized in that: The support connecting frame includes a long strip connecting rod located in the middle and connecting legs fixed at both ends of the connecting rod in a U-shape with an opening facing outwards, and the outer ends of the connecting legs are connected to the corresponding layers of phase change material heat storage structures.

6. The soil-air heat exchanger according to claim 1, characterized in that: The tube body is a metal tube; a layer of phase change material is also encapsulated inside the material of the tube body.

7. An air-conditioning air-inlet pipe structure, comprising an air-inlet pipe buried in the soil below the ground surface, characterized in that The portion of the air inlet pipe located in the soil has at least one section which is constituted by the soil-air heat exchanger as described in any one of claims 1 to 6.

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