Solar panel heat exchanger and heat exchange method thereof

Abstract

The application provides a solar panel heat exchanger and a heat exchange method thereof. The solar panel heat exchanger comprises a shell with an inner cavity, a bottom plate sealed to one side of the shell, cold fluid channels and hot fluid channels arranged in the inner cavity, a glass cover plate arranged on the other side of the shell, and a heat absorption plate arranged in the inner cavity. An air layer is formed in the interlayer between the glass cover plate and the heat absorption plate. The cold fluid channels and the hot fluid channels are arranged in the direction from the air layer to the bottom plate in sequence. A plurality of baffles are arranged in the cold fluid channels to form meandering channels. A plurality of baffles are arranged in the hot fluid channels to form meandering channels. The meandering channels in the cold fluid channels have the same trend as the meandering channels in the hot fluid channels. The application can make full use of solar energy, form a double heat source heat exchange structure together with the hot fluid channels, and improve the heat exchange efficiency of the panel heat exchanger.

Description

Technical Field

[0001] This invention relates to a plate heat exchanger, and more particularly to a solar plate heat exchanger and its heat exchange method. Background Technology

[0002] A heat exchanger is an energy-saving device that transfers hot fluid to cold fluid, and it is widely used in refrigeration and air conditioning, district heating, power, food processing, and other fields. Common types of heat exchangers include shell-and-tube heat exchangers, plate heat exchangers, coaxial tube heat exchangers, and tube-fin heat exchangers.

[0003] Plate heat exchangers are the most typical type of indirect heat exchanger, characterized by high heat exchange efficiency, compact and lightweight structure, and long service life, thus occupying a dominant position in heat exchanger design. A plate heat exchanger consists of a cold fluid channel for introducing a cold fluid and a hot fluid channel for introducing a hot fluid. The cold and hot fluids are separated and flow within their respective channels to exchange heat.

[0004] There is a lack of research on how to introduce external heat sources to enhance heat exchange efficiency in existing plate heat exchangers, especially on how to make good use of solar energy for heat exchange, which has not yet been applied to plate heat exchangers. Summary of the Invention

[0005] The purpose of this invention is to provide a solar plate heat exchanger and its heat exchange method that can utilize solar energy for heat exchange, which can significantly improve the heat exchange efficiency of the plate heat exchanger.

[0006] The technical solution of the present invention is as follows: A solar panel heat exchanger includes a shell with an inner cavity, a bottom plate covering one side of the shell, a cold fluid channel and a hot fluid channel disposed in the inner cavity, a glass cover plate covering the other side of the shell, and a heat-absorbing plate disposed in the inner cavity. An air layer is formed in the interlayer between the glass cover plate and the heat-absorbing plate. The cold fluid channel and the hot fluid channel are arranged sequentially from the air layer toward the bottom plate. The cold fluid channel is provided with a plurality of baffles that enable the cold fluid channel to form a meandering channel, and the multiple hot fluid channels are provided with a plurality of baffles that enable the hot fluid channels to form meandering channels. The meandering channel in the cold fluid channel has the same direction as the meandering channel in the hot fluid channel.

[0007] In the above scheme, by setting a heat-absorbing plate at the upper end of the cold fluid channel that can absorb sunlight and convert solar energy into heat energy, the plate heat exchanger can make full use of solar energy and form a dual heat source heat exchange structure together with the hot fluid channel, thereby improving the heat exchange efficiency of the plate heat exchanger.

[0008] Preferably, the solar panel heat exchanger further includes a corrugated heat exchange plate and a sealing plate. A cold fluid channel is formed in the interlayer between the heat-absorbing plate and the corrugated heat exchange plate, and a hot fluid channel is formed in the interlayer between the corrugated heat exchange plate and the sealing plate. The sealing plate serves a sealing function and enhances the pressure-bearing capacity of the heat exchanger.

[0009] Preferably, the baffle connects the heat-absorbing plate, the corrugated heat exchange plate, and the sealing plate in the thickness direction of the outer shell. The baffle serves to guide the flow, enhance heat exchange, and increase the pressure-bearing capacity of the heat exchanger.

[0010] In order to enhance heat exchange and increase the rigidity of the heat exchange plate, the outer surface of the corrugated heat exchange plate is provided with herringbone corrugations.

[0011] Preferably, the baffle has an A end and a B end that are arranged opposite to each other, and the outer shell has an inner wall C and an inner wall D that are opposite to each other. Among the multiple baffles, the A end of the baffle located in the odd-numbered position is connected to the inner wall C of the outer shell, and the B end of the baffle located in the odd-numbered position is separated from the inner wall D of the outer shell; the B end of the baffle located in the even-numbered position is connected to the inner wall D of the outer shell, and the A end of the baffle located in the even-numbered position is separated from the inner wall C of the outer shell. A gap is formed between every two baffles, and multiple gaps are connected in sequence to form a meandering channel.

[0012] The circuitous channels of the above structure increase the fluid flow path, thereby increasing the heat exchange time between hot and cold fluids, enabling countercurrent heat exchange between hot and cold fluids, and improving heat exchange efficiency.

[0013] Preferably, the solar panel heat exchanger further includes an insulation layer disposed between the hot fluid channel and the base plate. The insulation layer provides insulation, thereby extending the service life of the heat exchanger.

[0014] In order to absorb solar radiation to the maximum extent, the surface of the heat-absorbing plate facing the glass cover is provided with a heat-absorbing coating.

[0015] Preferably, the housing is provided with a cold fluid inlet and a cold fluid outlet communicating with the cold fluid channel. The cold fluid inlet and the cold fluid outlet are located on opposite sides of the housing, and the cold fluid inlet is positioned slightly lower than the cold fluid outlet.

[0016] The outer casing is also provided with a hot fluid inlet and a hot fluid outlet that communicate with the hot fluid channel. The hot fluid inlet and the hot fluid outlet are located on opposite sides of the outer casing, and the hot fluid outlet is positioned slightly lower than the hot fluid inlet.

[0017] The present invention also provides a method for heat exchange using the above-mentioned solar panel heat exchanger, comprising: introducing a cold fluid into a cold fluid channel and a hot fluid into a hot fluid channel, wherein the tortuous structure of the cold fluid channel and the hot fluid channel enables countercurrent heat exchange between the cold and hot fluids; solar radiation shines on the heat-absorbing plate through the glass cover plate, the heat-absorbing plate converts solar energy into heat energy, and then transfers the heat energy to the cold fluid in the cold fluid channel, thereby heating the cold fluid and forming a dual heat source heat exchange.

[0018] Preferably, an ambient temperature value or a solar radiation intensity value is set, and the ambient temperature or solar radiation intensity is detected before the solar panel heat exchanger is started. The detected ambient temperature is compared with a preset value, or the detected solar radiation intensity is compared with a preset value. If it is lower than the preset value, the heat fluid channel is started; if it is higher than the preset value, the heat fluid channel is closed.

[0019] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0020] I. The solar panel heat exchanger provided by this invention can achieve different heat source modes according to different weather conditions and usage scenarios. When the solar radiation intensity is high, the heat fluid channel can be closed, and only solar energy can provide heat; when the solar radiation intensity is low and solar energy alone cannot meet the heat exchange requirements, the heat fluid channel can be opened, and both solar energy and the heat fluid can provide heat; when there is no solar radiation at night, the heat fluid provides heat.

[0021] Second, the present invention adds a baffle between the heat absorption plate and the sealing plate, and the formed meandering channel increases the heat exchange time of the hot and cold fluids. The baffle can also act as a fin to enhance the heat exchange of the hot and cold fluids.

[0022] Third, the present invention sets a corrugated heat exchange plate between the hot and cold fluids, which not only enhances the heat exchange of the hot and cold fluids, but also increases the rigidity of the heat exchange plate. Attached Figure Description

[0023] Figure 1 A partial cross-sectional structural diagram of the solar panel heat exchanger provided by the present invention;

[0024] Figure 2 A schematic internal cross-sectional view of the solar panel heat exchanger provided by the present invention;

[0025] Figure 3 This is a schematic diagram of the corrugated heat exchange plate.

[0026] Figure 4 This is a schematic diagram of the cold air circulation channel.

[0027] Figure 5 This is a schematic diagram of the structure of a hot fluid channel.

[0028] In the attached diagram: 1. Outer shell; 2. Glass cover plate; 3. Heat absorber plate; 4. Corrugated heat exchange plate; 5. Baffle; 6. Sealing plate; 7. Insulation layer; 8. Base plate; 9. Cold fluid inlet; 10. Cold fluid outlet; 11. Hot fluid inlet; 12. Hot fluid outlet; 13. Cold fluid channel; 14. Hot fluid channel; 15. Air layer. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0030] like Figure 1 , Figure 2 As shown, the solar panel heat exchanger provided in this embodiment includes a shell 1, a glass cover plate 2, a heat absorption plate 3, a corrugated heat exchange plate 4, a baffle 5, a sealing plate 6, a heat insulation layer 7, a bottom plate 8, a cold fluid inlet 9, a cold fluid outlet 10, a hot fluid inlet 11, a hot fluid outlet 12, a cold fluid channel 13, a hot fluid channel 14, and an air layer 15.

[0031] The outer shell 1 has an inner cavity, which is made of 10mm-20mm thick carbon steel plate. A glass cover 2 covers one side of the outer shell 1, and a bottom plate 8 covers the other side. Within the inner cavity, from top to bottom, a heat-absorbing plate 3, a corrugated heat exchange plate 4, a sealing plate 6, and an insulation layer 7 are arranged sequentially. An air layer 15 is formed in the interlayer between the glass cover 2 and the heat-absorbing plate 3. The glass cover 2 is made of 5mm tempered glass, which effectively transmits solar radiation, protects the heat-absorbing plate 3, and reduces heat loss. The heat-absorbing plate 3 is made of copper with a thickness of 1.5mm. Its surface facing the glass cover 2 is coated with a high-absorption coating (such as an electroplated coating or a black chrome coating) to maximize the absorption of solar radiation. A cold fluid channel 13 is formed in the interlayer between the heat-absorbing plate 3 and the corrugated heat exchange plate 4. Figure 3 As shown, the corrugated heat exchange plate 4 is made of titanium with a thickness of 1.5mm, which has good corrosion resistance. Its surface is provided with herringbone corrugations, which can enhance heat exchange and increase the rigidity of the heat exchange plate.

[0032] A hot fluid channel 14 is formed in the interlayer between the corrugated heat exchange plate 4 and the sealing plate 6. The sealing plate 6 is made of 5mm thick stainless steel, which serves a sealing function and enhances the pressure resistance of the heat exchanger.

[0033] The baffle 5 connects the heat-absorbing plate 3, the corrugated heat exchange plate 4, and the sealing plate 6 in the thickness direction of the outer shell 1. For example... Figure 4As shown, the baffle 5 has opposite ends A and B, and the outer shell 1 has opposite inner walls C and D. Among the multiple baffles 5, the baffles 5 located in odd-numbered positions have their ends A connected to the inner wall C of the outer shell 1 and their ends B spaced apart from the inner wall D of the outer shell 1. The baffles 5 located in even-numbered positions have their ends B connected to the inner wall D of the outer shell 1 and their ends A spaced apart from the inner wall C of the outer shell 1. A gap is formed between every two baffles 5. A gap is also formed between the baffles 5 and the side wall of the outer shell 1 (the side wall connecting the inner walls C and D). Multiple gaps are connected in sequence to form a meandering channel. The meandering channel refers to... Figure 4 The structure shown is a winding and spiraling pattern. For example... Figure 4 , Figure 5 As shown, the meandering path in the cold fluid channel 13 is the same as the meandering path in the hot fluid channel 14.

[0034] like Figure 2 As shown, the baffles 5 in the cold fluid channel 13 are aligned one-to-one with the baffles 5 in the hot fluid channel 14. The baffles 5 are 1.5mm thick aluminum plates, which serve to guide the flow, enhance heat exchange, and increase the pressure resistance of the heat exchanger.

[0035] The insulation layer 7 can be made of high-density sponge or phenolic foam, 50mm thick, which has good insulation performance and quality stability.

[0036] The base plate 12 located below the insulation layer 7 is a 2mm thick galvanized steel plate. The base plate 8 can protect the insulation layer 7 and extend the service life of the heat exchanger.

[0037] like Figure 1 As shown, the outer casing 1 is provided with a cold fluid inlet 9 and a cold fluid outlet 10 communicating with the cold fluid channel 13. The outer casing 1 is also provided with a hot fluid inlet 11 and a hot fluid outlet 12 communicating with the hot fluid channel 14. The cold fluid inlet 9 and the hot fluid outlet 12 are arranged adjacent to each other, and the cold fluid outlet 10 and the hot fluid inlet 11 are arranged adjacent to each other. Figure 4 As shown, the cold fluid inlet 9 and the cold fluid outlet 10 are located on opposite sides of the housing 1, with the cold fluid inlet 9 positioned slightly lower than the cold fluid outlet 10. Figure 5 As shown, the hot fluid inlet 11 and the hot fluid outlet 12 are located on opposite sides of the housing 1, and the hot fluid outlet 12 is positioned slightly lower than the hot fluid inlet 11.

[0038] The present invention also provides a method for heat exchange using the above-mentioned solar panel heat exchanger, comprising: setting an ambient temperature value or a solar radiation intensity value; detecting the ambient temperature or solar radiation intensity before starting the solar panel heat exchanger; comparing the detected ambient temperature with a preset value; or comparing the detected solar radiation intensity with a preset value.

[0039] If the value is lower than the preset value, the hot fluid channel 14 is activated: cold fluid is introduced into the cold fluid channel 13 and hot fluid is introduced into the hot fluid channel 14. The circuitous structure of the cold fluid channel 13 and the hot fluid channel 14 enables countercurrent heat exchange between the cold and hot fluids. Solar radiation shines through the glass cover plate 2 onto the heat absorber plate 3. The heat absorber plate 3 converts solar energy into heat energy and then transfers the heat energy to the cold fluid in the cold fluid channel 13. The cold fluid is heated and its temperature rises, thus forming a dual heat source heat exchange.

[0040] If the value is higher than the preset value, the heat fluid channel 14 will be closed, and heat exchange will only be carried out by sunlight.

[0041] The solar panel heat exchanger provided by this invention can achieve different heat source modes according to different weather conditions and usage. When the solar radiation intensity is high, the heat fluid channel can be closed, and only solar energy can provide heat; when the solar radiation intensity is low and solar energy alone cannot meet the heat exchange demand, the heat fluid channel can be opened, and both solar energy and the heat fluid can provide heat; when there is no solar radiation at night, the heat fluid provides heat.

[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A solar panel heat exchanger, comprising a shell (1) having an inner cavity, a base plate (8) sealing one side of the shell (1), a cold fluid channel (13) and a hot fluid channel (14) disposed in the inner cavity, characterized in that, It also includes a glass cover plate (2) covering the other side of the outer shell (1) and a heat-absorbing plate (3) set in the inner cavity. An air layer (15) is formed in the interlayer between the glass cover plate (2) and the heat-absorbing plate (3). The cold fluid channel (13) and the hot fluid channel (14) are arranged sequentially from the air layer (15) toward the bottom plate (8). The cold fluid channel (13) is provided with multiple baffles (5) that enable the cold fluid channel (13) to form a meandering channel. The multiple hot fluid channels (14) are provided with multiple baffles (5) that enable the hot fluid channels (14) to form a meandering channel. The meandering channel in the cold fluid channel (13) is the same as the meandering channel in the hot fluid channel (14). A heat-absorbing plate that can absorb sunlight and convert solar energy into heat energy is set at the upper end of the cold fluid channel (13), so that the plate heat exchanger can make full use of solar energy and form a dual heat source heat exchange structure together with the hot fluid channel set at the lower end of the cold fluid channel (13).

2. The solar panel heat exchanger according to claim 1, characterized in that, It also includes a corrugated heat exchange plate (4) and a sealing plate (6), wherein the cold fluid channel (13) is formed in the interlayer between the heat absorption plate (3) and the corrugated heat exchange plate (4), and the hot fluid channel (14) is formed in the interlayer between the corrugated heat exchange plate (4) and the sealing plate (6).

3. The solar panel heat exchanger according to claim 2, characterized in that, The baffle (5) connects the heat-absorbing plate (3), the corrugated heat exchange plate (4) and the sealing plate (6) in the thickness direction of the outer shell (1).

4. The solar panel heat exchanger according to claim 2, characterized in that, The outer surface of the corrugated heat exchange plate (4) is provided with herringbone corrugations.

5. The solar panel heat exchanger according to claim 1, characterized in that, The baffle (5) has an A end and a B end that are arranged opposite to each other. The outer shell (1) has an inner wall C and an inner wall D that are opposite to each other. Among the multiple baffles (5), the A end of the baffle (5) located in the odd position is connected to the inner wall C of the outer shell (1), and the B end of the baffle (5) located in the odd position is separated from the inner wall D of the outer shell (1). The B end of the baffle (5) located in the even position is connected to the inner wall D of the outer shell (1), and the A end of the baffle (5) located in the even position is separated from the inner wall C of the outer shell (1). There is a gap between every two baffles (5), and multiple gaps are connected in sequence to form a meandering channel.

6. The solar panel heat exchanger according to claim 1, characterized in that, It also includes an insulation layer (7) between the hot fluid channel (14) and the base plate (8).

7. The solar panel heat exchanger according to claim 1, characterized in that, The heat-absorbing plate (3) has a heat-absorbing coating on the side of the plate facing the glass cover (2).

8. The solar panel heat exchanger according to claim 1, characterized in that, The outer casing (1) is provided with a cold fluid inlet (9) and a cold fluid outlet (10) communicating with the cold fluid channel (13). The cold fluid inlet (9) and the cold fluid outlet (10) are located on opposite sides of the outer casing (1), and the cold fluid inlet (9) is positioned slightly lower than the cold fluid outlet (10). The outer casing (1) is also provided with a hot fluid inlet (11) and a hot fluid outlet (12) communicating with the hot fluid channel (14). The hot fluid inlet (11) and the hot fluid outlet (12) are located on opposite sides of the outer casing (1), and the hot fluid outlet (12) is set slightly lower than the hot fluid inlet (11).

9. A method for heat exchange using a solar panel heat exchanger according to any one of claims 1-8, characterized in that, include: Cold fluid is introduced into the cold fluid channel (13) and hot fluid is introduced into the hot fluid channel (14). The circuitous structure of the cold fluid channel (13) and hot fluid channel (14) allows for countercurrent heat exchange between the cold and hot fluids. Solar radiation shines through the glass cover plate (2) onto the heat absorber plate (3). The heat absorber plate (3) converts solar energy into thermal energy and then transfers the heat energy to the cold fluid in the cold fluid channel (13). The cold fluid is heated and its temperature rises, thus forming a dual heat source heat exchange.

10. The heat exchange method according to claim 9, characterized in that, Set the ambient temperature value or the solar radiation intensity value. Before starting the solar panel heat exchanger, detect the ambient temperature or the solar radiation intensity. Compare the detected ambient temperature with the preset value, or compare the detected solar radiation intensity with the preset value. If it is lower than the preset value, start the heat fluid channel (14). If it is higher than the preset value, shut down the heat fluid channel (14).

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