A thermal radiation enhancing coating and its application, and a radiation heat exchange device using the coating

Abstract

The present invention relates to an enhanced thermal radiation coating and its application, and a radiation heat exchange device using the coating. The enhanced thermal radiation coating comprises a reinforcing material component, a black material component, and an adhesive; the reinforcing material component is silicon and / or boron. The enhanced thermal radiation coating can be coated on the surface of a metal material and used as an enhanced thermal radiation coating. A radiation heat exchange device comprises a first metal radiation plate, a heat exchange core plate composed of a second metal radiation plate and a heat transfer channel; the heat exchange core plate is parallel to the first metal radiation plate and has a minimum spacing of 1-3mm; the surfaces of the heat exchange core plate and the first metal radiation plate are both provided with an enhanced thermal radiation coating. The coating of the present invention can form a coating on the surface of a metal material, which can greatly improve the absorptivity and emissivity of the surface of the metal material; the radiation heat exchange device can be used for cooling and / or heating, can cool in a relatively humid and hot environment without condensation, and has a high cooling capacity.

Description

Technical Field

[0001] The invention relates to the field of radiation heat exchange, in particular to a heat radiation enhanced coating and its application, and a radiation heat exchange device using the coating. Background Art

[0002] There are roughly the following types of metal radiation heat exchange plates in the prior art:

[0003] The heat exchange copper tube and the metal radiation heat transfer plate are in direct contact. The heat exchange copper tube and the metal radiation plate are connected by heat conduction. This mode is mostly used in air-conditioning occasions. The heat exchange copper tube in Northern Europe uses 12℃ cold water, and the surface temperature of the metal radiation plate is 20℃, but there is a 14℃ cold line on the surface of the metal radiation plate, which is still OK in Northern Europe most of the time. However, in a relatively hot and humid environment, 14℃ is already below the dew point temperature, and the metal radiation plate will condense. In order to avoid condensation, 16℃ cold water is used. The temperature of the contact part between the metal radiation plate surface and the heat exchange copper tube is only 18℃, and the temperature of the plate surface without contact rises to 24℃. The cooling capacity of the metal radiation plate is very low, so when used in air-conditioning occasions in areas with large heat and humidity loads, this high-temperature water metal radiation plate can only be used as a supplement to ordinary air conditioning.

[0004] Other improved metal radiation plate structures: In order to solve the problem of cold uniformity on the metal radiation plate surface, TROX presses the heat exchange copper tube into a The metal base is grooved and then bonded to the metal plate with thermally conductive adhesive. However, during heating operation, the thermally conductive adhesive loses its stickiness after baking and cannot conduct heat; therefore, the TROX manual states that "cannot provide heating".

[0005] There are also products that bury the heat exchange copper tube in the graphite material and then fix the graphite block on the metal plate with thermal conductive glue. However, when all metal radiation plate products are in refrigeration conditions, due to condensation on the surface, the heat exchange refrigerant temperature cannot be lower than the air dew point temperature. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an enhanced thermal radiation coating, which has an extraordinary function of absorbing and emitting thermal radiation energy in the infrared band. When coated on the surface of a metal material, it can greatly improve the absorption rate and emissivity of the metal material surface; it also provides a radiation heat exchange device, which is coated between a first metal radiation plate and a heat exchange core plate to form an enhanced thermal radiation coating, which greatly improves the heat exchange efficiency between the first metal radiation plate and the heat exchange core plate; it can be used for cooling or heating; it can be used for cooling in a relatively humid and hot environment without condensation, and has a high cooling capacity.

[0007] The technical solution adopted by the present invention to solve its technical problem is: an enhanced thermal radiation coating, which includes 4-6 parts of a reinforcing material component, 6-13 parts of a black material component, and 81-90 parts of an adhesive in parts by mass; wherein the reinforcing material component is a mixture of one or both of silicon and boron in any proportion; the black material component is used to increase the blackness of the coating, and the adhesive component is used to provide adhesion ability for the coating.

[0008] The black material component is one of black iron oxide, carbon black and manganese dioxide or a mixture of several of them in any proportion.

[0009] The adhesive comprises 50-60 parts of a solvent and 20-40 parts of an adhesive component by mass; the solvent comprises one of xylene, trimethylbenzene, tetramethylbenzene, 1,2-dichloroethane, and n-butyl acetate, or a mixture of any proportion of several of them; the adhesive component is a copolymer of styrene, n-butyl acrylate, and isopropyl acrylate; wherein the molar ratio of styrene, n-butyl acrylate, and isopropyl acrylate is (4-6):(2-4):1.

[0010] The enhanced thermal radiation coating is prepared from 2.5 parts of elemental silicon powder, 2.5 parts of elemental boron powder, 2 parts of carbon black, 2 parts of manganese dioxide, 6 parts of black iron oxide, 30 parts of a copolymer of styrene / n-butyl acrylate / isopropyl acrylate, 37 parts of xylene, 12 parts of 1,2-dichloroethane, and 6 parts of n-butyl acetate, specifically, by mass, wherein the molar ratio of styrene, n-butyl acrylate, and isopropyl acrylate is 5:3:1.

[0011] An application of an enhanced thermal radiation coating is to coat the enhanced thermal radiation coating on the surface of a metal material to form an enhanced thermal radiation coating.

[0012] A radiation heat exchange device comprises a first metal radiation plate, a second metal radiation plate, and a heat transfer channel; the second metal radiation plate is in contact with the heat transfer channel and together constitutes a heat exchange core plate; the first metal radiation plate is provided with a first radiation heat exchange zone on a side close to the heat exchange core plate; the heat exchange core plate corresponds to the first radiation heat exchange zone of the first metal radiation plate, and is placed in parallel with each other and has a gap, and the minimum spacing between the heat exchange core plate and the first metal radiation plate is 1-3mm; the heat exchange core plate is provided with an enhanced thermal radiation coating on the surface of the side close to the first metal radiation plate and on the surface of the first radiation heat exchange zone.

[0013] The gap is formed by an isolation net arranged between the heat exchange core plate and the first metal radiation plate. The skeleton of the isolation net is used to provide isolation support function, and the mesh of the isolation net is used to provide space for radiation heat exchange; the thickness of the isolation net is 1-3mm, which is used to make the minimum distance between the heat exchange core plate and the first metal radiation plate be 1-3mm.

[0014] The thickness of the isolation net is 2 mm, which is used to ensure that the minimum distance between the heat exchange core plate and the first metal radiation plate is 2 mm.

[0015] The heat transfer channel is a heat transfer coil, and a heat transfer medium is arranged inside it; the second metal radiation plate is pressed with a first groove corresponding to the heat transfer coil, and the heat transfer coil is placed in the first groove of the second metal radiation plate, and a pressure strip is also correspondingly provided on the first groove of the second metal radiation plate; the pressure strip also has a second groove corresponding to the first groove; the first groove and the second groove together form a accommodating channel for the heat transfer coil; the pressure strip is also used to make the outer wall of the heat transfer coil close to the inner wall of the groove of the second metal radiation plate.

[0016] The radiation heat exchange device also includes an outer cover, which forms a closed cavity with the first metal radiation plate, and the heat exchange core plate is arranged in the cavity; a heat-insulating body is arranged in the outer cover, and the heat-insulating body is bonded to the first metal radiation plate to form a temperature-insulating sealed cavity, which is used to prevent water vapor from entering the cavity between the heat exchange core plate and the first metal radiation plate to form internal condensation, and is also used to isolate the heat transfer between the outer cover and the heat exchange core plate; the outer cover is used to reflect the energy of external thermal radiation through the outer surface, and can protect the heat-insulating body from external force damage; the two ends of the heat transfer coil pass through the heat-insulating body and the outer cover respectively and are exposed to the outside of the radiation heat exchange device; the outer cover is provided with a through hole at the position where the heat transfer coil passes through; a sealing ring that is sleeved on the heat transfer coil is also provided in the through hole.

[0017] Advantages of the present invention: The enhanced thermal radiation coating of the present invention has an extraordinary absorption and emission of thermal radiation energy in the infrared band. When coated on the surface of a metal material, it can greatly improve the absorptivity and emissivity of the metal material surface; the radiation heat exchange device can be used for cooling or heating, especially for cooling in a relatively humid and hot environment without condensation, and has a higher cooling capacity; the enhanced thermal radiation coating is formed by coating the enhanced thermal radiation coating between the first metal radiation plate and the heat exchange core plate, which greatly improves the heat exchange efficiency between the first metal radiation plate and the heat exchange core plate; by setting a minimum spacing of 1-3mm between the first metal radiation plate and the heat exchange core plate, sub-near-field thermal radiation is formed, which, on the one hand, avoids the distance between the two plates being too close, resulting in a more obvious cold temperature line during cooling and making the plate surface easy to condense; on the other hand, the sub-near-field radiation greatly improves the heat exchange efficiency between the first metal radiation plate and the heat exchange core plate. The radiation efficiency at the heat coil, combined with the enhanced heat radiation coating, can make the heat radiation of the two plates more uniform, and improve the temperature uniformity of the outer surface of the first metal radiation plate (the side in contact with the temperature-controlled environment), which can further avoid the appearance of a more obvious cold temperature line during cooling. Due to the lack of the influence of the cold temperature line, a heat transfer medium with a lower temperature can be used for cooling without condensation; the design of the pressure strip and the second radiation metal plate wrapped on the heat transfer coil ensures the closest contact with the heat transfer coil to the greatest extent, thereby ensuring the heat exchange efficiency of the second radiation metal plate and the heat transfer coil; the design of the insulation body can isolate external water vapor and heat, avoid the influence of the external environment on the radiation heat transfer between the first metal radiation plate and the heat exchange core plate, and avoid internal condensation between the two; the design of the outer cover can protect the insulation body from external damage and can be further sealed. In addition, the outer surface of the outer cover can be designed to be a mirror surface to reflect the heat radiation of the external environment;. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a radiation heat exchange device according to Embodiment 1;

[0019] Figure 2 A schematic diagram of an explosion state of a radiation heat exchange device in Example 1;

[0020] Figure 3 A schematic diagram of the internal structure of a radiation heat exchange device according to Embodiment 1;

[0021] Figure 4 This is a schematic diagram of the assembly of a first radiation metal plate and a heat exchange core plate of a radiation heat exchange device in Example 1. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0023] Embodiment 1

[0024] like Figures 1 to 4 As shown, this embodiment provides a radiation heat exchange device, including a first metal radiation plate 100, a second metal radiation plate 400, and a heat transfer channel 500; the second metal radiation plate 400 is in contact with the heat transfer channel 500 and together constitutes a heat exchange core plate; the first metal radiation plate 100 is provided with a first radiation heat exchange zone on a side close to the heat exchange core plate; the heat exchange core plate corresponds to the first radiation heat exchange zone of the first metal radiation plate 100, and is placed in parallel and has a gap, and the minimum spacing between the heat exchange core plate and the first metal radiation plate is 2mm; the heat exchange core plate is provided with an enhanced thermal radiation coating 200 on the surface of one side close to the first metal radiation plate 100 and on the surface of the first radiation heat exchange zone.

[0025] In a radiation heat exchange device of the present embodiment, the interval is formed by an isolation net 300 arranged between the heat exchange core plate and the first metal radiation plate 100. The skeleton of the isolation net 300 is used to provide an isolation support function, and the mesh of the isolation net 300 is used to provide a space for radiation heat exchange; the thickness of the isolation net is 2 mm, which is used to make the minimum distance between the heat exchange core plate and the first metal radiation plate be 2 mm.

[0026] In a radiation heat exchange device of the present embodiment, the heat transfer channel 500 is a heat transfer coil, and a heat transfer medium is arranged inside it; a first groove corresponding to the heat transfer coil is pressed on the second metal radiation plate 400, and the heat transfer coil is placed in the first groove of the second metal radiation plate 400, and a pressure strip 800 is also correspondingly provided on the first groove of the second metal radiation plate 400; the pressure strip 800 also has a second groove corresponding to the first groove; the first groove and the second groove together form a accommodating channel for the heat transfer coil; the pressure strip 800 is also used to make the outer wall of the heat transfer coil tightly attached to the inner wall of the groove of the second metal radiation plate 400; radiation heat exchange is carried out between the heat exchange core plate and the first radiation heat exchange area of ​​the first metal radiation plate; the second metal radiation plate and the heat transfer coil are subjected to conduction heat exchange.

[0027] In a radiation heat exchange device of the present embodiment, the radiation heat exchange device also includes an outer cover 700, and the outer cover 700 and the first metal radiation plate 100 form a closed cavity, and the heat exchange core plate is arranged in the cavity; the outer cover 700 is used to reflect the energy of external heat radiation through the outer surface, and is also used to isolate the inside and outside of the cavity; an insulation body 600 is also arranged between the inner side of the outer cover 700 and the heat exchange core plate, which is used to isolate the heat exchange core plate from the outer cover 700; the insulation body 600 also seals the heat exchange core plate 402 on the metal radiation core plate 400 to prevent water vapor from entering the interval cavity between the heat exchange core plate and the first metal radiation plate; the two ends of the heat transfer coil pass through the insulation body 600 and the outer cover 700 respectively and are exposed to the outside of the radiation heat exchange device; the outer cover 700 is provided with a through hole 702 at the position where the heat transfer coil 500 passes through; the through hole 702 is also provided with a sealing ring 701 that is sleeved on the heat transfer coil 500.

[0028] In a radiation heat exchange device of this embodiment, the first metal radiation plate and the second metal radiation plate are preferably aluminum plates, which have the advantages of light weight, easy processing, and low cost; of course, other metal plates can also be selected for processing.

[0029] In a radiation heat exchange device of this embodiment, the heat transfer channel is generally a copper tube, and can also be a heat-conducting pipe of other materials. The medium in the pipe flows to take away the heat from the surface of the heat exchange core plate. The heat transfer medium can be various cold / hot media, which is not specifically limited here.

[0030] In a radiation heat exchange device of the present embodiment, a gap is set between the second metal radiation plate 400 and the first metal radiation plate 100, and the minimum spacing is limited to 1-3mm, and preferably 2mm; this is because: when the distance between two surfaces generating infrared radiation is very close, strong thermal radiation will also occur, which is called near-field radiation; specifically in the radiation heat exchange device, when the distance between the second metal radiation plate and the first radiation metal plate is too close, through the near-field radiation, the low temperature line of the heat transfer coil during cooling will be projected onto the first radiation metal plate, forming a more obvious cold temperature line, and at this time, the plate surface of the first radiation metal plate is prone to condensation at the corresponding position, and when we control the distance between the second metal radiation plate and the first radiation metal plate to 1-3mm, especially 2mm, the thermal radiation heat exchange capacity of the second metal radiation plate and the first radiation metal plate is the strongest, and, during cooling, the first radiation metal plate has no obvious low temperature cold line, which we call sub-near-field spacing, which can maximize the cooling or heating efficiency of the radiation heat exchange device.

[0031] In a radiation heat exchange device of the present embodiment, in order to ensure that a certain spacing is provided between the heat exchange core plate and the first metal radiation plate 100, an isolation net is sandwiched between the heat exchange core plate and the first metal radiation plate. The isolation net is a mesh structure made of a material with low thermal conductivity. The skeleton of the mesh structure is used to provide an isolation support function, and the mesh is used to provide space for radiation heat exchange. For better effects, the larger the mesh, the better, while ensuring support.

[0032] In a radiation heat exchange device of the present embodiment, the second metal radiation plate is in contact with the heat transfer channel in a manner that allows heat conduction. Of course, the larger the contact area, the higher the efficiency of heat conduction. The present embodiment provides a contact method between the second metal radiation plate and the heat transfer channel, specifically a contact method between the second metal radiation plate and the heat transfer coil. The heat transfer coil is an S-shaped coil, which has a plurality of parallel straight tube portions and curved tube portions connecting the straight tube portions. The second metal radiation plate is provided with a first groove corresponding to the straight tube portion. The straight tube portion of the heat transfer coil is placed in the first groove of the second metal radiation plate, and a pressure strip is further provided on the upper side of the straight tube portion. The pressure strip is also provided with a second groove corresponding to the straight tube portion. The pressure strip is wrapped around the outer side of the straight tube portion through the second groove in cooperation with the first groove of the second metal radiation plate. Usually, the first groove and the second groove are both approximately semicircular, and the two ends of the semicircle are connected to the second metal radiation plate or The plane of the molding is rounded for easy processing; the molding and the first metal radiation plate can be fixed together by crimping, bonding, welding or other processing methods. Through this design, the molding and the first metal radiation plate can be in close contact with the heat-conducting coil, which can increase the heat conduction contact area with the heat-conducting coil and reduce the heat conduction gap between the heat-conducting coil and the heat-conducting coil, thereby maximizing the heat conduction efficiency with the heat-conducting coil; further, the overall heat transfer of the heat exchange core plate is made more uniform, while the influence of the straight pipe portion of the heat transfer coil on the heat transfer uniformity is reduced, which solves the problem of low-temperature lines from another perspective, and can further reduce the temperature of the heat transfer medium in the heat transfer coil during cooling without condensation. In addition, due to the uniformity of heat transfer, the temperature uniformity of the first radiation metal plate can be further improved, so that the first radiation metal plate as a whole participates in the temperature regulation of the environment, which can greatly improve the heat exchange capacity of the radiation heat exchange device.

[0033] In a radiation heat exchange device of the present embodiment, the design of an outer cover 700 and a heat preservation body 600 is also adopted. The heat preservation body is covered on the outside of the heat exchange core plate and is sealed with the first metal radiation plate 100. On the one hand, it can effectively prevent the heat exchange core plate from exchanging heat with the external environment and affecting the heat exchange efficiency. On the other hand, it can prevent water vapor from the external environment from entering and forming internal condensation, which affects the heat exchange efficiency. The outer cover arranged on the outside of the heat preservation body is also sealed with the first metal radiation plate. On the one hand, it protects the internal heat preservation body from being damaged by external force. On the other hand, it also forms a second seal. At the same time, the outer surface of the outer cover is designed to be a mirror surface, which provides a white body function and reflects the radiant heat from the external environment. In addition, through the design of the outer cover and the heat preservation body, the heat exchange core plate can also be firmly fixed, and the distance between the heat exchange core plate and the first metal radiation plate can be further kept stable.

[0034] In a radiation heat exchange device of the present embodiment, the heat transfer coil extends through the insulation body and extends out of the outer cover, and a sealing ring is arranged between the outer cover and the heat transfer coil to ensure that the heat exchange core plate is not affected by the external environment; and joints 501 are also arranged at both ends of the heat transfer coil. The heat transfer coils of multiple radiation heat exchange devices can be connected in series and / or in parallel through the joints 501, and then connected to the cold / heat medium pipeline of the refrigeration or heating device.

[0035] A radiation heat exchange device of this embodiment, when cooling, the first radiation metal plate absorbs external radiation heat, and emits heat to the second radiation metal plate through the enhanced heat radiation coating, the enhanced heat radiation coating on the surface of the second radiation metal plate absorbs heat and transfers it to the second radiation metal plate, and the heat is taken away by the cold heat transfer medium in the heat transfer coil fixed on the second radiation metal plate; when heating, the hot heat transfer medium in the copper tube fixed on the second radiation metal plate transfers heat to the second radiation metal plate through conduction, the relatively high temperature second radiation metal plate emits heat to the relatively low temperature first radiation metal plate through the enhanced heat radiation coating, the enhanced heat radiation coating of the first radiation metal plate absorbs heat and transfers it to the first radiation metal plate, and the first radiation metal plate then emits heat to other surfaces in the room, thereby increasing the temperature of each surface to achieve the effect of indoor heating.

[0036] Embodiment 2

[0037] The enhanced thermal radiation coating that forms the enhanced thermal radiation coating of Example 1 is prepared from a reinforcing material component, a black material component and a binder; it is specifically prepared from 2.5 parts of silicon powder, 2.5 parts of boron powder, 2 parts of carbon black, 2 parts of manganese dioxide, 6 parts of black iron oxide, 30 parts of a copolymer of styrene / n-butyl acrylate / isopropyl acrylate, 37 parts of xylene, 12 parts of 1,2-dichloroethane, and 6 parts of n-butyl acetate, wherein the molar ratio of styrene, n-butyl acrylate, and isopropyl acrylate is 5:3:1.

[0038] In the enhanced thermal radiation coating of this embodiment, the powder of the enhanced material component and the powder of the black material component can be evenly dispersed in the adhesive component. When used, it is coated on the surface of the metal material to form an enhanced thermal radiation coating. When the coating is combined with the metal material, the thermal radiation capacity of the metal material can be greatly improved. This is because: metal materials are called conventional radiation materials in the infrared radiation band, and when silicon or boron is added to the metal plate, the magnetic conductivity of the material can be greatly enhanced; and we have found through research that when silicon or boron is added to the metal plate, its thermal radiation emissivity and absorptivity are also greatly enhanced, and it is called an unconventional thermal radiation material; however, when silicon or boron is added to the metal material, not only does it require a very high cost, but the resulting metal plate is very brittle and difficult to process. When silicon or boron is made into a coating and then coated on a metal plate to form an enhanced thermal radiation coating, the radiation heat exchange capacity of the metal plate can be greatly increased; and when the enhanced thermal radiation coating is formed on the side close to the first metal radiation plate and the heat exchange core plate, the absorptivity and emissivity between the two can be more than twice that of conventional thermal radiation materials without a coating; and, by coating the coating, the components can be evenly distributed, so that the thermal radiation of the entire coating is uniform, and there is no cold / hot spot; and, it can be firmly bonded to the metal material.

[0039] The enhanced thermal radiation coating of the present embodiment is used in a relatively low temperature environment to greatly improve the efficiency of radiation heat exchange, while the existing thermal radiation coating is used on the lining of a relatively high temperature furnace to reduce heat loss, which is essentially different from the coating of the present embodiment; in the enhanced thermal radiation coating of the present embodiment, the reinforcing material components of silicon and / or boron and the black material components of carbon black and / or manganese dioxide and / or black iron oxide, by matching with the surface of the metal material, can make the surface of the metal material have an extraordinary emissivity; and, the black material components of carbon black and / or manganese dioxide and / or black iron oxide can also effectively increase the blackness of the surface of the metal material and the surface roughness of the coating formed, thereby improving the absorptivity and the specific surface area of ​​radiation heat exchange; the adhesive makes the coating formed by the coating have strong adhesion; through the combination of the above components, an enhanced thermal radiation coating is formed on the surface of the metal material, so that the metal material has an extraordinary high absorptivity and high emissivity.

[0040] The effect of the above embodiment is verified by the following experiments.

[0041] We designed a test bench to simulate the indoor environment. The test bench is a cube with the top surface of the inner wall as a cold water radiation panel and the other five surfaces of the inner wall as hot water radiation panels. It is a thermal radiation panel that uses hot water on the inner walls and floors to simulate the indoor environment.

[0042] Experimental method: The relative humidity of the simulated indoor environment inside the test bench is controlled and maintained at 60%, then, the cold water radiation panel on the top is started, and the top radiation panel is adjusted to and maintained at the set temperature of 20°C, and the hot water radiation panels on the other five sides are turned on, and the radiation panels on these five sides are adjusted to and maintained at 26°C (simulating the average radiation temperature of the real room indoor environment); at the same time, relevant parameters are tested: cold water inlet / outlet temperature, cold water flow, hot water inlet / outlet temperature, hot water flow, heat absorbed by the cold plate, and heat released by the hot plate.

[0043] The trial was divided into three groups:

[0044] A: In the cold water radiation plate and the hot water radiation plate, the surface of the heat exchange core plate and the first radiation heat exchange area does not have an enhanced heat radiation coating; the minimum spacing between the heat exchange core plate and the first metal radiation plate is 10mm;

[0045] B: In the cold water radiation plate and the hot water radiation plate, the surface of the heat exchange core plate and the first radiation heat exchange area are all provided with an enhanced heat radiation coating; the minimum spacing between the heat exchange core plate and the first metal radiation plate is 10 mm;

[0046] C: In the cold water radiation plate and the hot water radiation plate, the surfaces of the heat exchange core plate and the first radiation heat exchange area have enhanced thermal radiation coatings; the minimum spacing between the heat exchange core plate and the first metal radiation plate is 2 mm.

[0047] The three groups of experiments were tested separately and the results were obtained in Table 1.

[0048] Table 1 Test data of test A, B and C

[0049]

[0050] By comparing the data obtained in Table 1, it can be clearly concluded that the use of enhanced thermal radiation coating can significantly improve the radiation heat exchange efficiency by comparing Test B with Test A; by comparing Test C with Test B, it can be clearly concluded that the use of a sub-near field distance of 2 mm can significantly improve the radiation heat exchange efficiency, and by comparing Test C with Test A, it can be clearly concluded that the use of enhanced thermal radiation coating and the use of a sub-near field distance can greatly improve the radiation heat exchange efficiency. At the same time, there is no condensation on the lower surface of the first radiation metal plate of the cold water radiation plate on the top surface of Test C.

[0051] The radiation heat exchange device of the above-mentioned embodiment can be used as a heat exchange unit for regulating the temperature of indoor or outdoor environments of residential buildings and public buildings, and can be specifically designed as wall panels, ceilings, etc.; it can also be used as a heat exchange device for communication base stations, server equipment and computer rooms. Of course, it can also be used in other relatively low-temperature heat exchange occasions.

[0052] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A coating for enhancing thermal radiation, characterized in that: Used to coat the surface of metal materials to form an enhanced thermal radiation coating; It comprises 4-6 parts of reinforcing material components, 6-13 parts of black material components and 81-90 parts of adhesives by weight; wherein the reinforcing material components are a mixture of one or both of elemental silicon powder and elemental boron powder in any proportion.

2. The heat radiation enhancing coating according to claim 1, characterized in that: The black material component is one of black iron oxide, carbon black and manganese dioxide or a mixture of several of them in any proportion.

3. The heat radiation enhancing coating according to claim 2, characterized in that: The adhesive comprises 50-60 parts of a solvent and 20-40 parts of an adhesive component by mass; the solvent comprises one of xylene, trimethylbenzene, tetramethylbenzene, 1,2-dichloroethane, and n-butyl acetate, or a mixture of any proportion of several of them; the adhesive component is a copolymer of styrene, n-butyl acrylate, and isopropyl acrylate; wherein the molar ratio of styrene, n-butyl acrylate, and isopropyl acrylate is (4-6): (2-4):

1.

4. The heat radiation enhancing coating according to claim 3, characterized in that: The enhanced thermal radiation coating is prepared specifically from 2.5 parts of elemental silicon powder, 2.5 parts of elemental boron powder, 2 parts of carbon black, 2 parts of manganese dioxide, 6 parts of black iron oxide, 30 parts of a copolymer of styrene / n-butyl acrylate / isopropyl acrylate, 37 parts of xylene, 12 parts of 1,2-dichloroethane, and 6 parts of n-butyl acetate, wherein the molar ratio of styrene, n-butyl acrylate, and isopropyl acrylate is 5:3:

1.

5. A radiation heat exchange device using the enhanced heat radiation coating as claimed in any one of claims 1 to 4 to form an enhanced heat radiation coating on a metal surface, characterized in that: It includes a first metal radiation plate, a second metal radiation plate, and a heat transfer channel; the second metal radiation plate is in contact with the heat transfer channel and together constitutes a heat exchange core plate; the first metal radiation plate is provided with a first radiation heat exchange zone on a side close to the heat exchange core plate; the heat exchange core plate corresponds to the first radiation heat exchange zone of the first metal radiation plate, and is placed in parallel with each other and has a gap, and the minimum spacing between the heat exchange core plate and the first metal radiation plate is 1-3mm; the heat exchange core plate is provided with the enhanced thermal radiation coating on the surface of the side close to the first metal radiation plate and the surface of the first radiation heat exchange zone.

6. A radiation heat exchange device according to claim 5, characterized in that: The gap is formed by an isolation net arranged between the heat exchange core plate and the first metal radiation plate. The skeleton of the isolation net is used to provide isolation support function, and the mesh of the isolation net is used to provide space for radiation heat exchange; the thickness of the isolation net is 1-3mm, which is used to make the minimum distance between the heat exchange core plate and the first metal radiation plate be 1-3mm.

7. A radiation heat exchange device according to claim 6, characterized in that: The thickness of the isolation net is 2 mm, which is used to ensure that the minimum distance between the heat exchange core plate and the first metal radiation plate is 2 mm.

8. The radiation heat exchange device according to claim 6, characterized in that: The heat transfer channel is a heat transfer coil, and a heat transfer medium is arranged inside it; the second metal radiation plate is pressed with a first groove corresponding to the heat transfer coil, and the heat transfer coil is placed in the first groove of the second metal radiation plate, and a pressure strip is also correspondingly provided on the first groove of the second metal radiation plate; the pressure strip also has a second groove corresponding to the first groove; the first groove and the second groove together form a accommodating channel for the heat transfer coil; the pressure strip is also used to make the outer wall of the heat transfer coil close to the inner wall of the groove of the second metal radiation plate.

9. The radiation heat exchange device according to claim 8, characterized in that: The radiation heat exchange device also includes an outer cover, which forms a closed cavity with the first metal radiation plate, and the heat exchange core plate is arranged in the cavity; a heat-insulating body is arranged in the outer cover, and the heat-insulating body is bonded to the first metal radiation plate to form a temperature-insulating sealed cavity, which is used to prevent water vapor from entering the cavity between the heat exchange core plate and the first metal radiation plate to form internal condensation, and is also used to isolate the heat transfer between the outer cover and the heat exchange core plate; the outer cover is used to reflect the energy of external heat radiation through the outer surface and protect the heat-insulating body from external force damage; the two ends of the heat transfer coil pass through the heat-insulating body and the outer cover respectively and are exposed to the outside of the radiation heat exchange device; the outer cover is provided with a through hole at the position where the heat transfer coil passes through; a sealing ring that is sleeved on the heat transfer coil is also provided in the through hole.

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