CN112577992A - Thermal radiation testing device and method - Google Patents
Thermal radiation testing device and method Download PDFInfo
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- CN112577992A CN112577992A CN202011218551.7A CN202011218551A CN112577992A CN 112577992 A CN112577992 A CN 112577992A CN 202011218551 A CN202011218551 A CN 202011218551A CN 112577992 A CN112577992 A CN 112577992A
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Abstract
The invention belongs to the technical field of thermal radiation testing, and particularly discloses a thermal radiation testing device and method for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating. The thermal radiation testing device comprises an insulation box, a temperature detecting device and a heat source. The heat insulation box is internally provided with a heat transfer cylinder, the temperature detection device is arranged in the heat transfer cylinder and can form a vacuum cavity with the heat transfer cylinder, and the heat source can convey heat to the temperature detection device through the vacuum cavity. The vacuum cavity can block conduction heat transfer and convection heat transfer, so that heat is transferred between the temperature detection device and the heat source only through radiation heat transfer. The outer surface of the temperature detection device can be coated with the radiant heat-preservation and heat-insulation thin-layer coating, and the temperature value detected by the temperature detection device can reflect the heat-preservation and heat-insulation capacity of the radiant heat-preservation and heat-insulation thin-layer coating.
Description
Technical Field
The invention relates to the technical field of thermal radiation testing, in particular to a thermal radiation testing device and method for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating.
Background
Conduction, radiation, and convection are three ways of heat transfer. At present, in the test of the heat preservation and insulation capability of the heat preservation and insulation thin layer coating, the measurement mode based on the heat conduction technology and the heat radiation and heat convection technology is generally used as an auxiliary. For radiation type heat preservation and insulation thin layer coating, the existing testing technology cannot effectively reflect the function of the coating in practical application. Moreover, the production and manufacturing costs of pure radiant heat sources, i.e., blackbody materials or near-pure radiant heat sources such as graphene heat sources, are very high, and are not suitable for practical production and life.
Disclosure of Invention
The invention aims to provide a thermal radiation testing device and a thermal radiation testing method, which aim to solve the problem that the existing testing technology cannot effectively test the thermal insulation capability of a radiant thermal insulation thin-layer coating.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermal radiation testing apparatus for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating, the thermal radiation testing apparatus comprising:
the heat insulation box is internally provided with a heat transfer cylinder;
the temperature detection device is arranged in the heat transfer cylinder, a vacuum cavity can be formed between the temperature detection device and the heat transfer cylinder, and the outer surface of the temperature detection device can be coated with the radiant heat preservation and insulation thin-layer coating;
and the heat source is arranged in the heat insulation box and can convey heat to the temperature detection device through the vacuum cavity.
Further, the temperature detection device comprises a heat conduction container and a temperature detector, the vacuum cavity can be formed between the heat conduction container and the heat transfer cylinder, the outer surface of the heat conduction container can be coated with the radiant heat preservation and insulation thin layer coating, heat conduction liquid is arranged in the heat conduction container, and the temperature detector can detect the temperature of the heat conduction liquid.
Further, the heat conducting container is made of glass, and/or the heat conducting liquid is glycerin.
Further, the temperature detection device is a temperature detector, and the radiant heat-preservation heat-insulation thin-layer coating can be coated on the surface of the temperature detector.
Further, the heat transfer cylinder is made of glass, and the heat source is located between the heat transfer cylinder and the shell of the heat preservation box.
Further, the heat source is hot fluid, the thermal radiation testing device further comprises a circulating heating device, the circulating heating device comprises a heater, a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with the heater and the heat insulation box, the liquid outlet pipe is communicated with the heat insulation box and the heater, and the heater is configured to be capable of heating to form the hot fluid.
Further, the distance between the heater and the temperature detection device is greater than 5 m.
Further, the heat source is water.
Further, the temperature of the water is 60-100 ℃.
The present invention also provides a heat radiation testing method applied to the heat radiation testing apparatus as described in any one of the above, including the steps of:
a. placing a temperature detection device in the heat transfer cylinder; the outer surface of the temperature detection device is coated with a radiant heat-preservation heat-insulation thin layer coating or is not coated with the radiant heat-preservation heat-insulation thin layer coating;
b. a vacuum cavity is formed between the temperature detection device and the heat transfer cylinder;
c. keeping the heat source at a preset temperature, recording the temperature value detected by the temperature detector every 10min, and calculating the average value of the temperature values detected by the temperature detector for N times, wherein N is greater than 3 and is a positive integer.
The invention has the beneficial effects that: the invention provides a thermal radiation testing device and a thermal radiation testing method, which are used for testing the thermal insulation capability of a radiation type thermal insulation thin-layer coating. The thermal radiation testing device comprises an insulation box, a temperature detecting device and a heat source. The heat insulation box is internally provided with a heat transfer cylinder, the temperature detection device is arranged in the heat transfer cylinder and can form a vacuum cavity with the heat transfer cylinder, and the heat source can convey heat to the temperature detection device through the vacuum cavity. The vacuum cavity can block conduction heat transfer and convection heat transfer, so that heat can be transferred between the temperature detection device and the heat source only through radiation heat transfer. The outer surface of the temperature detection device can be coated with the radiant heat-preservation and heat-insulation thin-layer coating, and the temperature value detected by the temperature detection device can reflect the heat-preservation and heat-insulation capacity of the radiant heat-preservation and heat-insulation thin-layer coating.
Drawings
Fig. 1 is a schematic structural diagram of a thermal radiation detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a thermal radiation detection apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a thermal radiation detection apparatus according to a third embodiment of the present invention.
In the figure:
1. a heat preservation box; 11. a heat transfer cylinder; 111. an interlayer; 12. a vacuum chamber; 13. sealing the cavity;
2. a temperature detection device; 21. radiation type heat insulation thin layer coating; 22. a heat conductive container; 23. a temperature detector;
3. a circulation heating device; 31. a heater; 32. a liquid inlet pipe; 33. a liquid outlet pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It is to be further noted that, for the convenience of description, only a part of the structure relating to the present invention is shown in the drawings, not the whole structure.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, and that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Further, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used based on the orientations or positional relationships shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, the present embodiment provides a thermal radiation testing apparatus for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating 21. The thermal radiation testing device comprises an insulation box 1, a temperature detection device 2 and a heat source. Wherein, the heat transfer cylinder 11 is arranged in the heat preservation box 1. The temperature detection device 2 is arranged in the heat transfer cylinder 11 and can form a vacuum cavity 12 with the heat transfer cylinder 11. The outer surface of the temperature detection device 2 can be coated with a radiation type heat preservation and insulation thin layer coating 21. The heat source is provided in the heat insulating box 1, and can transfer heat to the temperature detection device 2 through the vacuum chamber 12.
At present, in the test of the heat preservation and insulation capability of the heat preservation and insulation material, the measurement mode based on the heat conduction technology and the heat radiation and heat convection technology is generally used as an auxiliary. For the radiant heat-preservation and heat-insulation thin-layer coating 21, the existing testing technology cannot effectively reflect the function in practical application. Moreover, the production and manufacturing costs of pure radiation heat sources, i.e., blackbody materials or near-pure radiation heat sources such as graphene heat sources, are very high, and are not suitable for practical production and life. The embodiment provides a thermal radiation testing device for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating 21. The vacuum chamber 12 can block conductive heat transfer and convective heat transfer, so that heat is transferred between the temperature detection device 2 and the heat source only by radiative heat transfer. The outer surface of the temperature detection device 2 can be coated with the radiant heat-preservation and heat-insulation thin-layer coating 21, and the temperature value detected by the temperature detection device 2 can reflect the heat-preservation and heat-insulation capacity of the radiant heat-preservation and heat-insulation thin-layer coating 21. Specifically, different thin coatings may be coated on the outer surface of the temperature detection device 2, and the temperature values detected by the temperature detection device 2 may reflect different insulation capabilities of the different thin coatings with respect to radiant heat. In this embodiment, the material of the heat insulating box 1 is a metal material. Of course, in other embodiments, the material of the incubator 1 may be a foam material or a waterproof cloth material or a plastic, etc. The heat insulation box 1 can ensure that the heat transfer between the temperature detection device 2 and the heat source is not easily influenced by the external environment, so that the measurement result is more accurate.
Further, as shown in fig. 1, the temperature detection device 2 includes a heat conduction container 22 and a temperature detector 23, the heat conduction container 22 and the heat transfer cylinder 11 can form a vacuum chamber 12 therebetween, the outer surface of the heat conduction container 22 can be coated with a radiation-type heat-insulating thin-layer coating 21, the heat conduction container 22 has a heat conduction liquid therein, and the temperature detector 23 can detect the temperature of the heat conduction liquid. The heat conductive container 22 is capable of absorbing radiant heat from a heat source and transferring the heat to the heat conductive liquid. At this time, the temperature of the heat transfer liquid can reflect the amount of radiation heat absorbed by the temperature detection device 2. Compared with a thermistor sensor and the like, the temperature detection device 2 is low in cost and convenient to process. Specifically, in the present embodiment, the material of the heat conductive container 22 is glass. The glass is low in price, easy to obtain, high in heat absorption rate, high in efficiency of transferring radiant heat with a heat source and capable of reducing heat loss. In the case where the heat source is the same, the heat conductive container 22 using the material of glass causes the temperature of the heat conductive liquid to be higher than the heat conductive container 22 using the material of low heat absorption rate. At this time, if the outer surface of the temperature detection device 2 is coated with the thin layer coatings with different heat insulation capabilities, the temperature change of the heat conduction liquid will be obvious, and the detection of the heat insulation capability of the radiative heat insulation thin layer coating 21 can be more accurate. In this embodiment, the heat transfer liquid is glycerin. Of course, in other embodiments, the heat transfer fluid may be kerosene or other like material. In the present embodiment, the temperature detector 23 is a mercury thermometer. Of course, in other embodiments, the temperature detector 23 may be a digital thermometer or the like.
Further, the heat transfer cylinder 11 is made of glass, and the heat source is located between the heat transfer cylinder 11 and the casing of the heat insulation box 1. So set up, be convenient for manufacturing. And the glass has larger thermal emissivity, so that higher radiant heat transfer rate can be realized between the heat source and the temperature detection device 2, and the heat loss can be reduced. In the case of the same heat source, the heat transfer cylinder 11 using a glass material may cause the heat transfer liquid to have a higher temperature than the heat transfer cylinder 11 using a low thermal emissivity material. In this case, if the outer surface of the temperature detection device 2 is coated with different thin coatings having different heat insulating capabilities, the temperature change of the heat conductive liquid becomes more significant. Specifically, as shown in fig. 1, in the present embodiment, a sealed chamber 13 is formed between the heat transfer drum 11 and the casing of the heat insulation box 1, and the heat source is located in the sealed chamber 13.
Further, as shown in fig. 1, the heat source is hot fluid, the thermal radiation testing apparatus further includes a circulation heating apparatus 3, the circulation heating apparatus 3 includes a heater 31, a liquid inlet pipe 32 and a liquid outlet pipe 33, the liquid inlet pipe 32 is connected to the heater 31 and the heat insulation box 1, the liquid outlet pipe 33 is connected to the heat insulation box 1 and the heater 31, and the heater 31 can be heated to form the hot fluid. The circulation heating device 3 can make the temperature of the heat source more stable, so that the heat transfer between the heat source and the temperature detection device 2 is more stable, and the measurement result is more accurate. Specifically, in the present embodiment, the liquid inlet pipe 32 communicates the heater 31 with the seal chamber 13. The liquid outlet pipe 33 communicates the sealed cavity 13 with the heater 31. In addition, in the present embodiment, the material of the liquid inlet pipe 32 and the material of the liquid outlet pipe 33 are both rubber. Rubber has thermal insulation and heat preservation capability, and can avoid thermal fluid from generating heat loss when liquid inlet pipe 32 and liquid outlet pipe 33 circulate.
Further, the distance between the heater 31 and the temperature detection device 2 is larger than 5 m. Preferably, in the present embodiment, the distance between the heater 31 and the temperature detection device 2 is 10 m. With the arrangement, the heat of the heater 31 can be prevented from being transferred to the temperature detection device 2 through radiation heat transfer, so that the heat received by the temperature detection device 2 is ensured to be from a heat source. The heat radiation of the heat source is more stable with respect to the heat radiation of the heater 31, enabling more accurate measurement results.
Further, the heat source is water. Specifically, the temperature of the water is 60 to 100 ℃. Preferably, in this embodiment, the temperature of the water is 80 ℃. The heat emissivity of water is 0.96, which is higher than most materials, so that the water and the temperature detection device 2 have higher heat transfer efficiency, thereby avoiding heat waste and being beneficial to saving cost. In addition, the water cost is low, the acquisition is easy, and the processing and the manufacturing of the heat radiation testing device are facilitated.
The present embodiment also provides a thermal radiation testing method applied to the thermal radiation testing apparatus as described above, the thermal radiation testing method including the steps of:
a. the temperature detection device 2 is arranged in the heat transfer cylinder 11; the outer surface of the temperature detection device 2 is coated with a radiation type heat preservation and insulation thin layer coating 21 or is not coated with the radiation type heat preservation and insulation thin layer coating 21;
b. so that a vacuum cavity 12 is formed between the temperature detection device 2 and the heat transfer cylinder 11;
c. keeping the heat source at a preset temperature, recording the temperature value detected by the temperature detector 23 every 10min, and calculating the average value of the temperature values detected by the temperature detector 23 for N times, wherein N is greater than 3 and is a positive integer.
Specifically, the external surface of the thermal radiation receiving device 2 is coated with a radiant heat-insulating thin-layer coating 21, and the average value of the N detection temperature values of the temperature detector 23 is calculated to be T1;
the external surface of the thermal radiation receiving device 2 is not coated with the radiant heat-preservation heat-insulation thin-layer coating 21, and the average value of N detection temperature values of the temperature detector 23 is calculated to be T2;
if T1< T2, it means that the temperature detection device 2 coated with the radiant heat-insulating thin layer coating 21 receives less heat, and the radiant heat-insulating thin layer coating 21 has heat-insulating ability.
Different radiation type heat preservation and insulation thin layer coatings 21 can be coated on the outer surface of the heat radiation receiving device 2 respectively, the average value of the temperature values detected by the temperature detector 23N times is calculated respectively, and the smaller the average value of the temperature values detected by the temperature detector 23 times is, the stronger the heat preservation and insulation capacity of the corresponding radiation type heat preservation and insulation thin layer coating 21 is.
Example two
The present embodiment provides a thermal radiation detection apparatus substantially the same as that of the first embodiment, and as shown in fig. 2, the thermal radiation detection apparatus mainly differs from that of the first embodiment in that: the heat transfer cylinder 11 is a composite structure with an interlayer 111 arranged inside, and a heat source is arranged in the interlayer 111. Specifically, in the present embodiment, the heat source is water. In the present embodiment, the liquid inlet pipe 32 communicates the heater 31 with the interlayer 111, and the liquid outlet pipe 33 communicates the interlayer 111 with the heater 31.
The remaining structure of the thermal radiation detection apparatus provided in this embodiment is the same as that of the thermal radiation detection apparatus in the first embodiment, and is not described herein again.
EXAMPLE III
The present embodiment provides a thermal radiation detection apparatus substantially the same as that of the first embodiment, and as shown in fig. 3, the main difference between the thermal radiation detection apparatus and that of the first embodiment is that: the temperature detection device 2 is a temperature detector 23, does not comprise a heat conduction container 22, and the radiation type heat preservation and insulation thin layer coating 21 is coated on the surface of the temperature detector 23.
The remaining structure of the thermal radiation detection apparatus provided in this embodiment is the same as that of the thermal radiation detection apparatus in the first embodiment, and is not described herein again.
It should be understood that the above-described examples are merely illustrative for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A thermal radiation testing device is used for testing the thermal insulation capability of a radiant type thermal insulation thin layer coating (21), and is characterized in that: the thermal radiation testing apparatus includes:
the heat insulation box (1) is internally provided with a heat transfer cylinder (11);
the temperature detection device (2) is arranged in the heat transfer cylinder (11) and can form a vacuum cavity (12) with the heat transfer cylinder (11), and the outer surface of the temperature detection device (2) can be coated with the radiant heat preservation and insulation thin layer coating (21);
and the heat source is arranged in the heat insulation box (1) and can convey heat to the temperature detection device (2) through the vacuum cavity (12).
2. The thermal radiation testing apparatus as set forth in claim 1, wherein: the temperature detection device (2) comprises a heat conduction container (22) and a temperature detector (23), the vacuum cavity (12) can be formed between the heat conduction container (22) and the heat transfer cylinder (11), the outer surface of the heat conduction container (22) can be coated with the radiant heat preservation and insulation thin layer coating (21), heat conduction liquid is arranged in the heat conduction container (22), and the temperature detector (23) is configured to be capable of detecting the temperature of the heat conduction liquid.
3. The thermal radiation testing apparatus as set forth in claim 2, wherein: the heat conducting container (22) is made of glass, and/or the heat conducting liquid is glycerin.
4. The thermal radiation testing apparatus as set forth in claim 1, wherein: the temperature detection device (2) is a temperature detector (23), and the radiant heat-preservation heat-insulation thin-layer coating (21) can be coated on the surface of the temperature detector (23).
5. The thermal radiation testing apparatus as set forth in claim 1, wherein: the heat transfer cylinder (11) is made of glass, and the heat source is positioned between the heat transfer cylinder (11) and the shell of the heat insulation box (1).
6. The thermal radiation testing apparatus as set forth in claim 1, wherein: the heat source is hot fluid, the thermal radiation testing device further comprises a circulating heating device (3), the circulating heating device (3) comprises a heater (31), a liquid inlet pipe (32) and a liquid outlet pipe (33), the liquid inlet pipe (32) is communicated with the heater (31) and the heat insulation box (1), the liquid outlet pipe (33) is communicated with the heat insulation box (1) and the heater (31), and the heater (31) is configured to be capable of being heated to form the hot fluid.
7. A thermal radiation testing device according to claim 6, characterized in that: the distance between the heater (31) and the temperature detection device (2) is larger than 5 m.
8. The thermal radiation testing apparatus as set forth in any one of claims 1-7, characterized in that: the heat source is water.
9. The thermal radiation testing apparatus as set forth in claim 8, wherein: the temperature of the water is 60-100 ℃.
10. A heat radiation testing method characterized by being applied to the heat radiation testing apparatus according to any one of claims 1 to 9, the heat radiation testing method comprising the steps of:
a. the temperature detection device (2) is arranged in the heat transfer cylinder (11); the outer surface of the temperature detection device (2) is coated with a radiant heat-preservation and heat-insulation thin layer coating (21) or is not coated with the radiant heat-preservation and heat-insulation thin layer coating (21);
b. a vacuum cavity (12) is formed between the temperature detection device (2) and the heat transfer cylinder (11);
c. keeping the heat source at a preset temperature, recording the temperature value detected by the temperature detector (23) every 10min, and calculating the average value of the temperature values detected by the temperature detector (23) for N times, wherein N is greater than 3 and is a positive integer.
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| CN202011218551.7A CN112577992A (en) | 2020-11-04 | 2020-11-04 | Thermal radiation testing device and method |
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| CN202011218551.7A CN112577992A (en) | 2020-11-04 | 2020-11-04 | Thermal radiation testing device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281378A (en) * | 2021-05-25 | 2021-08-20 | 华中科技大学 | Decoupling research device for end heat transfer of metallized film capacitor |
| CN114264694A (en) * | 2022-01-28 | 2022-04-01 | 云南中烟工业有限责任公司 | Testing device and testing method for proportion of infrared heating and thermal radiation of atomizing core |
| CN115015411A (en) * | 2022-05-27 | 2022-09-06 | 甘肃警察职业学院 | A built-in liquid heating desorption structure for poison analysis detects |
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2020
- 2020-11-04 CN CN202011218551.7A patent/CN112577992A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281378A (en) * | 2021-05-25 | 2021-08-20 | 华中科技大学 | Decoupling research device for end heat transfer of metallized film capacitor |
| CN113281378B (en) * | 2021-05-25 | 2023-03-24 | 华中科技大学 | Decoupling research device for end heat transfer of metallized film capacitor |
| CN114264694A (en) * | 2022-01-28 | 2022-04-01 | 云南中烟工业有限责任公司 | Testing device and testing method for proportion of infrared heating and thermal radiation of atomizing core |
| CN114264694B (en) * | 2022-01-28 | 2024-06-04 | 云南中烟工业有限责任公司 | Device and method for testing infrared heating radiation duty ratio of atomization core |
| CN115015411A (en) * | 2022-05-27 | 2022-09-06 | 甘肃警察职业学院 | A built-in liquid heating desorption structure for poison analysis detects |
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