Micro-channel direct expansion type photo-thermal plate

Abstract

The utility model discloses a microchannel direct expansion type photo-thermal plate, including big channel header, microchannel evaporator and photovoltaic external part, the number of big channel header is two, the two big channel header is equipped with the medium inlet and outlet respectively, the microchannel evaporator includes a plurality of microchannel rib calandria, the microchannel rib calandria is equipped with a plurality of microchannels, and the photovoltaic external part is equipped with the medium inlet and the medium outlet respectively. The two ends of the micro-channel are communicated with the two large-flow-channel headers respectively, the photovoltaic external part comprises a photovoltaic power generation panel and a heat conduction bonding layer, and the photovoltaic power generation panel is connected with the micro-channel rib calandria through the heat conduction bonding layer. The micro-channel rib calandria is arranged, the micro-channel type photovoltaic panel is used as the evaporator, the pressure of large flow channels at the two ends is uniform, and the overall temperature balance is achieved through the large-pressure-difference micro-channels.

Description

Technical Field

[0001] The utility model belongs to the field of energy conservation and environmental protection, and particularly relates to a microchannel direct expansion solar thermal panel. Background Art

[0002] The technical principle of the direct expansion air source heat pump is based on the reverse Carnot cycle, and the energy transfer and temperature rise are realized through four main components: a compressor, an evaporator, a condenser, and an expansion valve. The low-temperature heat energy in the air is absorbed by the evaporator, causing the refrigerant to evaporate into a gas state. Then, the gaseous refrigerant is sucked into and compressed by the compressor, resulting in an increase in temperature and pressure. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser to meet the heating or hot water demand, and at the same time condenses into a liquid state. The liquid refrigerant is depressurized and cooled through the expansion valve and then enters the evaporator cycle again.

[0003] The latest technical solutions include a new type of direct expansion radiation adjustable heating terminal combined with a flat heat pipe. This technology strengthens the peak heating capacity and dynamic adjustment ability by optimizing the internal thermal resistance and increasing forced convection. In addition, the design of using the flat heat pipe as a heat absorber reduces the length of the refrigerant pipeline, improving the stability and safety of the system. These technological advancements help to improve the energy efficiency ratio and heating performance of the heat pump, while promoting the electrification of the building heating terminal and contributing to the realization of the building carbon neutrality goal.

[0004] Although the existing direct expansion air source heat pump technology has significant advantages in terms of energy efficiency and environmental protection, there are also some disadvantages. For example, the performance of the system may be affected under extreme climate conditions, such as the heating efficiency may decrease at extremely low temperatures. In terms of maintenance and repair, due to the system directly exchanging heat with the air, there may be problems of dust and impurity accumulation, and regular cleaning is required to maintain the best performance. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present utility model is to provide a microchannel direct expansion solar thermal panel, which solves the above problems by changing the design structure and installation structure.

[0006] In order to solve the above problems existing in the prior art, the technical solution adopted by the present utility model is as follows:

[0007] A microchannel direct expansion solar thermal panel, comprising a large flow channel header, a microchannel evaporator, and a photovoltaic external component;

[0008] There are two large flow channel headers, and each of the two large flow channel headers is provided with a medium inlet and outlet (one of the large flow channel headers is provided with a medium inlet, and the other large flow channel header is provided with a medium outlet);

[0009] The microchannel evaporator includes a plurality of microchannel ribbed tubes, and the microchannel ribbed tubes are provided with a plurality of microchannels. Both ends of the microchannels are respectively communicated with two large flow channel headers;

[0010] The photovoltaic external component includes a photovoltaic power generation panel and a heat-conducting adhesive layer, and the photovoltaic power generation panel is connected to the microchannel ribbed tube through the heat-conducting adhesive layer.

[0011] Problems that the evaporator of a direct expansion heat pump may face during actual operation include uneven refrigerant distribution, large influence of the ambient temperature on efficiency, and performance degradation under extreme climate conditions, etc.

[0012] By arranging the microchannel ribbed tubes and adopting a microchannel photovoltaic panel as the evaporator, the pressures at both ends of the large flow channels are unified, and the overall temperature balance is achieved by using the large-pressure-difference microchannels.

[0013] Furthermore, the microchannel evaporator further includes a weather-resistant hydrophilic heat-absorbing film layer. The weather-resistant hydrophilic heat-absorbing film layer is wrapped outside the microchannel ribbed tube, and the weather-resistant hydrophilic heat-absorbing film layer is connected to the heat-conducting adhesive layer. Dust and impurities on the surface of the existing direct expansion heat pump evaporator will block sunlight, reducing the photothermal conversion efficiency; reducing the heat exchange efficiency and increasing energy consumption; corroding the heat-absorbing film layer and reducing the photothermal conversion life of the evaporator. By arranging the hydrophilic film layer outside the photothermal film, self-cleaning can be effectively achieved, and it has weather resistance and corrosion resistance effects, thereby improving the efficiency and service life of the photothermal panel.

[0014] Furthermore, the weather-resistant hydrophilic heat-absorbing film layer includes a black titanium heat-absorbing film on the inner layer and a titanium dioxide transparent hydrophilic film on the outer layer. The photovoltaic external component further includes a glass weather-resistant hydrophilic film layer, and the glass weather-resistant hydrophilic film layer is arranged on the side of the photovoltaic power generation panel away from the heat-conducting adhesive layer.

[0015] Furthermore, the cross-section of the microchannel ribbed tube is an oblong structure, and the microchannel ribbed tube is provided with three microchannels. By changing the structure of the microchannel ribbed tube from the original flat structure to a ribbed structure, it is convenient for installation and has a high error tolerance rate. The ratio of the inner diameter of the large flow channel header to the diameter of the microchannel is 25:1 - 100:1. Since the inner diameter of the large flow channel header is much larger than the diameter of the microchannel, the microchannel has little influence on the pressure in the large flow channel header, ensuring the stability of the flow.

[0016] Advantages of the present utility model:

[0017] 1. The present utility model adopts a microchannel evaporator, and uses the large-pressure-difference microchannels to achieve temperature balance of all ribbed rows of the entire evaporator, overall improving the COP, reducing energy consumption, and increasing the service life of the evaporator.

[0018] 2. The ribbed microchannels of the present utility model have gaps between the ribs, with a high error tolerance. When tightly adhered to the photovoltaic panel, the process difficulty only considers the paving process in the length direction of the ribs, with few process limitations, which can greatly improve production efficiency and the yield rate, and reduce the process cost.

[0019] 3. The wall thickness of the microchannel ribs of the present utility model has no limitation. Preferably, the wall thickness is 2 mm and the pressure resistance can be as high as 5 MPa, which improves the stability of the evaporator and the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present utility model Figure 1 。

[0021] Figure 2 is a schematic structural view of the present utility model Figure 2 。

[0022] Figure 3 is a schematic connection diagram of the large-flow channel header in the present utility model.

[0023] Figure 4 is a schematic structural view of the microchannel in the present utility model.

[0024] In the figure: 1 - large-flow channel header; 11 - medium inlet / outlet; 2 - microchannel evaporator; 21 - microchannel ribbed tube; 22 - weather-resistant hydrophilic heat-absorbing film layer; 23 - microchannel; 3 - photovoltaic external component; 31 - heat-conducting adhesive layer; 32 - photovoltaic power generation panel; 33 - glass weather-resistant hydrophilic film layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described below in conjunction with the drawings and the reference numerals.

[0026] In order to more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the present utility model will be described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0027] The terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] The following will describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0030] Embodiment 1:

[0031] As Figures 1-4 shown, a microchannel direct-expansion solar thermal panel includes a large-channel header 1, a microchannel evaporator 2, and a photovoltaic external component 3;

[0032] There are two large-channel headers 1, and the two large-channel headers 1 are respectively provided with medium inlet and outlet ports 11 (one of the large-channel headers 1 is provided with a medium inlet, and the other large-channel header 1 is provided with a medium outlet);

[0033] The microchannel evaporator 2 includes a plurality of microchannel finned tubes 21, the microchannel finned tubes 21 are provided with a plurality of microchannels 23, and both ends of the microchannels 23 are respectively communicated with the two large-channel headers 1;

[0034] The photovoltaic external component 3 includes a photovoltaic panel 32 and a heat-conducting adhesive layer 31, and the photovoltaic panel 32 is connected to the microchannel finned tube 21 through the heat-conducting adhesive layer.

[0035] Problems that the evaporator of a direct-expansion heat pump may face during actual operation include uneven refrigerant distribution, large influence of the ambient temperature on the efficiency, and performance degradation under extreme climate conditions, etc.

[0036] By providing the microchannel finned tube 21 and using a microchannel photovoltaic panel as the evaporator, the pressures at both ends of the large channels are unified, and the overall temperature balance is achieved by using the large-pressure-difference microchannels 23.

[0037] Embodiment 2:

[0038] On the basis of Embodiment 1, the microchannel evaporator 2 further includes a weather-resistant hydrophilic heat-absorbing film layer 22, the weather-resistant hydrophilic heat-absorbing film layer 22 is wrapped outside the microchannel finned tube 21, and the weather-resistant hydrophilic heat-absorbing film layer 22 is connected to the heat-conducting adhesive layer 31.

[0039] Dust and impurities on the surface of the existing direct-expansion heat pump evaporator will block sunlight, reducing the photo-thermal conversion efficiency; reducing the heat exchange efficiency and increasing energy consumption; corroding the heat-absorbing film layer and reducing the photo-thermal conversion life of the evaporator.

[0040] By providing a hydrophilic film layer outside the photo-thermal film, self-cleaning can be effectively achieved, and it has weather resistance and corrosion resistance effects, thereby improving the efficiency and service life of the solar thermal panel.

[0041] The weather-resistant hydrophilic heat-absorbing film layer 22 includes a black titanium heat-absorbing film on the inner layer and a titanium dioxide transparent hydrophilic film on the outer layer.

[0042] The photovoltaic external component 3 further includes a glass weather-resistant hydrophilic film layer 33, and the glass weather-resistant hydrophilic film layer 33 is arranged on the side of the photovoltaic power generation panel 32 away from the heat-conducting adhesive layer 31.

[0043] The glass weather-resistant hydrophilic film layer 33 includes glass on the inner layer and a titanium dioxide transparent hydrophilic film on the outer layer.

[0044] Example 3:

[0045] On the basis of Example 2, the cross-section of the microchannel ribbed tube 21 is an oblong structure, and the microchannel ribbed tube 21 is provided with three microchannels 23.

[0046] Changing the structure of the microchannel ribbed tube 21 from the original flat structure to a ribbed type is convenient for installation and has a high error tolerance.

[0047] The ratio of the inner diameter of the large flow channel header 1 to the diameter of the microchannel 23 is 25:1 - 100:1.

[0048] Since the inner diameter of the large flow channel header 1 is much larger than the diameter of the microchannel 23, the microchannel 23 has little influence on the pressure in the large flow channel header 1, ensuring the stability of the flow.

[0049] 1. The size of the microchannel evaporator 2 can be adjusted arbitrarily according to the size of the photovoltaic panel.

[0050] 2. The ribbed material of the microchannel 23 is a flexible and easily formed metal material, preferably aluminum, with a width range of 10 - 60 mm, preferably 32 mm; and a wall thickness of 1 - 10 mm, preferably 2 mm.

[0051] 3. The material of the large flow channel header 1 is a metal material, preferably the same material as the ribbed part of the microchannel 23.

[0052] 4. The inner diameter size range of the large flow channel header 1 is 10 - 50 mm, preferably 19 mm; and the wall thickness size range is 1 - 5 mm, preferably 2.5 mm.

[0053] 5. For the weather-resistant hydrophilic heat-absorbing film layer 22, a black titanium heat-absorbing film is used inside, and a titanium dioxide transparent hydrophilic film layer is on the outer layer.

[0054] 6. The error of the press-fitting adhesive force between the ribbed part and all positions of the photovoltaic panel is not greater than 10%.

[0055] 7. The diameter range of the microchannel 23 is 0.1 - 2 mm, preferably 0.3 mm; and the diameter error in the length direction is not greater than 5%.

[0056] 8. The inner wall roughness of the microchannel 23 is not greater than 0.4 micrometers.

[0057] Specific working principle: Sunlight passes through the glass weather-resistant hydrophilic film layer 33 and irradiates on the photovoltaic power generation panel 32. Part of it is converted into electrical energy, and part of it is converted into heat energy. The heat is conducted through the heat-conducting bonding layer 31 to the weather-resistant hydrophilic heat-absorbing film layer 22, and then transferred to the medium in the microchannel 23 through the microchannel ribbed tube 21.

[0058] The circulating medium enters and exits from the inlet and outlet medium port 11, flows in from the inlet medium port, is stored inside the large-flow-channel header 1 at the inlet medium port, passes through the microchannel 23, is stored inside the large-channel header at the outlet medium port, and then flows out from the outlet medium port, so as to achieve the heat exchange purpose.

[0059] The inner cavity of the large-flow-channel header 1 is relatively large, and the pressure in the header direction is basically balanced. The diameter of the microchannel 23 is very small, and the flow rate of a single microchannel 23 will not reduce the pressure of the medium in the large-flow-channel header 1. Therefore, the pressure in the direction of the large-flow-channel header 1 is basically the same. The pressure in the large-flow-channel header 1 on the same side of all microchannels 23 is almost the same, the pressure difference at both ends of all microchannels 23 is basically the same, the size of the microchannels 23 is basically the same, and the flow velocity and flow rate of the medium inside the microchannels 23 are basically the same.

[0060] The present utility model is not limited to the above optional implementation manners. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. A microchannel direct expansion solar thermal panel, characterized in that: It includes a large-flow-channel header (1), a micro-channel evaporator (2), and a photovoltaic external component (3); There are two large-flow-channel headers (1), and each of the two large-flow-channel headers (1) is provided with a medium inlet / outlet (11); The micro-channel evaporator (2) includes a plurality of micro-channel ribbed tubes (21), the micro-channel ribbed tubes (21) are provided with a plurality of micro-channels (23), and both ends of the micro-channels (23) are respectively communicated with the two large-flow-channel headers (1); The photovoltaic external component (3) includes a photovoltaic panel (32) and a heat-conducting adhesive layer (31), and the photovoltaic panel (32) is connected to the micro-channel ribbed tube (21) through the heat-conducting adhesive layer.

2. The microchannel direct expansion type photothermal plate according to claim 1, wherein: The micro-channel evaporator (2) further includes a weather-resistant hydrophilic heat-absorbing film layer (22), the weather-resistant hydrophilic heat-absorbing film layer (22) is wrapped outside the micro-channel ribbed tube (21), and the weather-resistant hydrophilic heat-absorbing film layer (22) is connected to the heat-conducting adhesive layer (31).

3. The microchannel direct expansion solar thermal panel according to claim 2, characterized in that: The weather-resistant hydrophilic heat-absorbing film layer (22) includes an inner black titanium heat-absorbing film and an outer titanium dioxide transparent hydrophilic film.

4. The microchannel direct expansion type solar thermal panel according to claim 1, characterized in that: The photovoltaic external component (3) further includes a glass weather-resistant hydrophilic film layer (33), and the glass weather-resistant hydrophilic film layer (33) is arranged on the side of the photovoltaic panel (32) away from the heat-conducting adhesive layer (31).

5. The microchannel direct expansion type solar thermal panel according to claim 4, wherein: The glass weather-resistant hydrophilic film layer (33) includes an inner layer of glass and an outer layer of titanium dioxide transparent hydrophilic film.

6. The microchannel direct expansion solar thermal panel according to claim 1, characterized in that: The cross-section of the micro-channel ribbed tube (21) is an oblong structure, and the micro-channel ribbed tube (21) is provided with three micro-channels (23).

7. The microchannel direct expansion type solar thermal panel according to claim 1, characterized in that: The ratio of the inner diameter of the large-flow-channel header (1) to the diameter of the micro-channel (23) is 25:1 - 100:1.

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