CN111272811A - Radiation refrigeration testing arrangement - Google Patents
Radiation refrigeration testing arrangement Download PDFInfo
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- CN111272811A CN111272811A CN202010163000.9A CN202010163000A CN111272811A CN 111272811 A CN111272811 A CN 111272811A CN 202010163000 A CN202010163000 A CN 202010163000A CN 111272811 A CN111272811 A CN 111272811A
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention relates to the technical field of radiation refrigeration, in particular to a radiation refrigeration testing device which comprises a testing device main body, a temperature measuring device and a support, wherein the testing device main body comprises a top surface supporting rod and a plurality of vertical rods, the top surface supporting rod and the vertical rods form a cavity together, a transparent net layer for placing a test sample is arranged at the bottom of the cavity, transparent films are coated on the periphery of the cavity, the temperature measuring device is arranged below the cavity, and the support comprises a plurality of supporting rods connected with the vertical rods. The invention has the advantages of simple structure, ingenious structure, low manufacturing cost, low solar radiation absorptivity, high light transmittance, good sealing performance and good test accuracy.
Description
Technical Field
The invention relates to the technical field of radiation refrigeration, in particular to a radiation refrigeration testing device.
Background
With the more and more remarkable global warming phenomenon, people need to invest more energy in the refrigeration field to achieve the expected cooling effect, which on one hand aggravates the energy crisis, and on the other hand, the living environment of people is further deteriorated due to more freon discharge generated by the large-area use of the refrigeration air conditioner. In this context, it is an urgent task to reduce energy consumption or develop new methods and techniques for cooling. At the moment, the radiation refrigeration is used as a refrigeration technology with zero energy consumption, safety, high efficiency and cleanness, and the practical application value is shown.
Radiation refrigeration is a passive cooling mode that an object radiates self heat to outer space through an atmospheric window by means of infrared emission to achieve self cooling. Electromagnetic waves of different wavelength bands have different transmittances for the atmosphere, and the so-called "atmospheric window" is a wavelength band in which the transmittance is high, such as 0.3 to 2.5 μm, 3.2 to 4.8 μm, and 8 to 13 μm. Among the many bands, the band of 8-13 μm is the most interesting one because black body radiation at normal temperature is mainly concentrated in this band.
For a long time, the experiment of radiation refrigeration is mainly carried out at night, because the temperature of the radiator can absorb a large amount of irradiation energy of the sun in the day to continuously rise, and the effect of radiation refrigeration cannot be shown. Until recently, scientists have developed a variety of materials that can achieve daytime radiation cooling and generally have the characteristics of high reflectivity of the material surface to solar radiation (wavelengths between 0.3 and 2.5 microns) and high infrared emissivity to the transparent atmospheric window spectrum (8 to 13 microns). Therefore, a new chapter in the field of radiation refrigeration research is opened, and a batch of excellent research works are developed. In these works, many new radiant cooling test devices have emerged, such as those designed by the university of stanford research team, 2017, where radiant cooling material is placed inside transparent glass culture dishes supported by three glass rods of about 20 cm in height, placed above the roof. The top of the dish is covered with a polyethylene film transparent to all radiated electromagnetic waves, acting as a convection shield. This device, although simple, presents two significant problems affecting the accuracy of the measurement: 1, a thicker glass culture dish is easy to absorb solar radiation to generate heat; 2, the distance from the culture dish to the ground is only 20 cm, and the ground surface with higher temperature can easily heat the sample in the culture dish by means of short-distance radiation heat transfer. For example, a scientific research team at the university of new mexico in 2018 in the united states designs a relatively complex device for radiation refrigeration research, but the outer surface of the device is covered by an aluminum foil, the inner surface of the device is made of a white opaque polystyrene foam material, and the aluminum foil and the polystyrene foam material absorb certain heat when being irradiated by sunlight, so that the accuracy of experimental measurement is influenced, particularly in a long-time test process.
Currently, radiation refrigeration testing devices are still under continuous improvement to minimize the impact of the absorption of solar radiation energy by the devices and the radiation heat transfer on the high-temperature ground on the test.
Disclosure of Invention
The invention aims to overcome the defects and provide a simple radiation refrigeration testing device, which improves the testing accuracy by reducing the absorption of the testing device to solar radiation energy and reducing the influence of high-temperature ground radiation heat transfer on a test sample.
In order to achieve the purpose, the technical solution of the invention is as follows: the utility model provides a radiation refrigeration testing arrangement, includes testing arrangement main part, temperature measuring device, support, the testing arrangement main part includes top surface bracing piece, a plurality of montant, top surface bracing piece, a plurality of montant constitute the cavity together, the bottom of cavity is provided with the transparent stratum reticulare that is used for placing test sample, the transparent stratum reticulare is woven by high strength nylon wire and is formed, the equal cladding in periphery of cavity has transparent film for the heat transfer that isolated air convection leads to, and the luminousness is high moreover, and the leakproofness is good, temperature measuring device sets up the below at the cavity, the support includes a plurality of branches of being connected with the montant.
Preferably, the thickness of the transparent film is 10-25 μm, so that heat absorption in the cavity is not easy, and the testing accuracy is improved.
Preferably, the top surface supporting rod and the vertical rod are made of transparent organic glass, and the rod piece is made of transparent organic glass, so that solar radiation absorption is reduced, and the influence of temperature rise of the rod piece on a test result is reduced.
Preferably, the top surface supporting rod and the vertical rod are both made of transparent polystyrene, and the rod piece is made of the transparent polystyrene, so that solar radiation absorption is reduced, and the influence of temperature rise of the rod piece on a test result is reduced.
Preferably, the height of the supporting rod is 1-2 m, and the heat radiation of the high-temperature ground to the test sample can be greatly reduced in the height range.
Preferably, the outer surface of the supporting rod is pasted with a silver film so as to reduce solar radiation absorption and reduce the influence of the rod piece on the test result.
Preferably, the outer surface of the supporting rod is painted with white paint to reduce solar radiation absorption and reduce the influence of the rod piece on the test result.
Preferably, still include a plurality of transparent mounting, transparent mounting is type of calligraphy, the head end of top surface bracing piece, the head end of montant all are provided with and supply transparent mounting male recess. When cladding transparent film, do further fixed to transparent film through transparent mounting, when guaranteeing good luminousness for transparent film is tighter, and sealing performance is strong, and isolated air convection promotes the accuracy nature of test result.
Preferably, the transparent film is made of transparent polyethylene. By selecting the transparent polyethylene film to coat the cavity, the solar radiation testing device has low absorptivity in a solar radiation wave band and high transparency in an atmospheric radiation window of 8-13 mu m, so that the testing device can be heated up by solar radiation without being obvious, the energy release of a test sample to the outside radiation is not influenced, and the accuracy of a test result is improved.
Preferably, the cavity is provided with a door capable of being opened and closed freely, so that sample loading and sampling are facilitated.
By adopting the technical scheme, the invention has the beneficial effects that: the cavity for placing the test sample is formed by adopting the transparent rod piece, the transparent film and the transparent net layer, the cavity is low in solar radiation absorptivity, good in transparency and strong in sealing performance, air convection is isolated, and the accuracy of the test result is greatly improved. The bottom of the testing device main body is provided with the support which is 1-2 m away from the ground, and the support is adhered with the silver film or painted with the white paint, so that the solar radiation absorption is reduced, the radiant heat effect of the high-temperature ground on a tested product is reduced, and the accuracy of a testing result is greatly improved. The invention has the advantages of simple structure, ingenious structure, low manufacturing cost, low solar radiation absorptivity, high light transmittance, good sealing performance and good test accuracy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is an enlarged view of a portion a in fig. 2.
Description of the main reference numerals: (1, a testing device main body; 11, a top surface supporting rod; 12, a vertical rod; 13, a cavity; 14, a transparent net layer; 15, a transparent film; 16, a door; 2, a temperature measuring device; 3, a bracket; 31, a supporting rod; 4, a transparent fixing piece; 41, a groove).
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in fig. 1, a radiation refrigeration testing arrangement, including testing arrangement main part 1, temperature measuring device 2, support 3, testing arrangement main part 1 includes top surface bracing piece 11, a plurality of montant 12, top surface bracing piece 11, a plurality of montant 12 constitute cavity 13 together, the bottom of cavity 13 is provided with the transparent stratum reticulare 14 that is used for placing the test sample, transparent stratum reticulare 14 is woven by high strength nylon wire and is formed, the periphery of cavity 13 all wraps has transparent film 15 for the heat transfer that isolated air convection leads to, and the luminousness is high moreover, and the leakproofness is good, temperature measuring device 2 sets up the below at cavity 13, support 3 includes a plurality of spinal branch 31 of being connected with montant 12.
The thickness of the transparent film 15 is 10-25 mu m, so that heat absorption in the cavity 13 is not easy, and the testing accuracy is improved.
The top surface supporting rod 11 and the vertical rod 12 are made of transparent organic glass, and the rod piece is made of the transparent organic glass, so that solar radiation absorption is reduced, and the influence of temperature rise of the rod piece on a test result is reduced.
The top surface supporting rod 11 and the vertical rod 12 are both made of transparent polystyrene, and the rod pieces are made of the transparent polystyrene, so that solar radiation absorption is reduced, and the influence of the temperature rise of the rod pieces on test results is reduced.
The height of the supporting rod 31 is 1m to reduce the heat radiation of the high-temperature ground to the test sample.
The outer surface of the supporting rod 31 is pasted with a silver film so as to reduce solar radiation absorption and reduce the influence of the rod piece on the test result.
The outer surface of the supporting rod 31 is painted with white paint to reduce solar radiation absorption and reduce the influence of the rod piece on the test result.
As shown in fig. 2-3, the portable ceiling lamp further comprises a plurality of transparent fixing members 4, the transparent fixing members 4 are in a convex shape, and grooves 41 for inserting the transparent fixing members 4 are formed in the head end of the top surface supporting rod 11 and the head end of the vertical rod 12. When the cladding transparent film, do further fixed to the transparent film through transparent mounting 4, when guaranteeing good luminousness for the transparent film is tighter, and sealing performance is strong, and isolated air convection promotes the accuracy nature of test result.
The transparent film 15 is made of transparent polyethylene. By selecting the transparent polyethylene film to coat the cavity, the solar radiation testing device has low absorptivity in a solar radiation wave band and high transparency in an atmospheric radiation window of 8-13 mu m, so that the testing device can be heated up by solar radiation without being obvious, the energy release of a test sample to the outside radiation is not influenced, and the accuracy of a test result is improved.
The cavity 13 is provided with a door 16 which can be freely opened and closed, so that sample loading and sampling are facilitated.
Comparative example: the radiation refrigeration testing device comprises a testing device body, a temperature measuring device and a glass supporting rod, wherein the testing device body is a transparent glass vessel and a transparent polyethylene film coated on the transparent glass vessel, the temperature measuring device is arranged below the transparent glass vessel, and the height of the glass supporting rod is 20 cm.
The accuracy of the radiation refrigeration performance test can be judged in the following manner. The temperature difference between the temperature of a certain commercial refrigeration film sample in the device in the embodiment and the comparative example and the temperature of the natural environment is tested under the same natural environment to represent that the larger the temperature difference is, the smaller the influence of the external environment on the device is, and the higher the test accuracy is. The test results are shown in Table 1.
Table 1: temperature of commercial refrigeration film sample in two device testing environments
| Sample temperature of refrigeration (. degree.C.) | Natural ambient temperature (. degree. C.) | Temperature difference (. degree. C.) | |
| Examples | 20.2 | 26.1 | -5.9 |
| Comparative example | 21.5 | 26.1 | -4.6 |
As can be seen from table 1, the temperature difference (absolute value) between the temperature in the example and the natural environment temperature is larger than that in the comparative example, which indicates that the test results of the example are more accurate than that of the comparative example, i.e., the example is less affected by the external environment than that of the comparative example.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the present invention, and all equivalent variations and modifications made in the claims of the present invention should be included in the scope of the present invention.
Claims (10)
1. A radiation refrigeration testing device is characterized in that: including testing arrangement main part, temperature measuring device, support, the testing arrangement main part includes top surface bracing piece, a plurality of montant, top surface bracing piece, a plurality of montant constitute the cavity together, the bottom of cavity is provided with the transparent stratum reticulare that is used for placing test sample, the peripheral equal cladding of cavity has transparent film, temperature measuring device sets up the below at the cavity, the support includes a plurality of branches of being connected with the montant.
2. A radiation refrigeration testing device as claimed in claim 1, wherein: the thickness of the transparent film is 10-25 μm.
3. A radiation refrigeration testing device as claimed in claim 1, wherein: the top surface supporting rod and the vertical rod are made of transparent organic glass.
4. A radiation refrigeration testing device as claimed in claim 1, wherein: the top surface supporting rod and the vertical rod are both made of transparent polystyrene.
5. A radiation refrigeration testing device as claimed in claim 1, wherein: the height of the supporting rod is 1-2 m.
6. A radiation refrigeration testing device as claimed in claim 1, wherein: the outer surface of the supporting rod is pasted with a silver film.
7. A radiation refrigeration testing device as claimed in claim 1, wherein: the outer surface of the supporting rod is painted with white paint.
8. A radiation refrigeration testing device as claimed in claim 1, wherein: still include the transparent mounting of a plurality of, transparent mounting is type of calligraphy, the head end of top surface bracing piece, the head end of montant all are provided with and supply transparent mounting male recess.
9. A radiation refrigeration testing device as claimed in claim 1, wherein: the transparent film is made of transparent polyethylene.
10. A radiation refrigeration testing device as claimed in claim 1, wherein: the cavity is provided with a door capable of being opened and closed freely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010163000.9A CN111272811A (en) | 2020-03-10 | 2020-03-10 | Radiation refrigeration testing arrangement |
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| CN202010163000.9A CN111272811A (en) | 2020-03-10 | 2020-03-10 | Radiation refrigeration testing arrangement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487283A (en) * | 2020-06-29 | 2020-08-04 | 宁波瑞凌新能源科技有限公司 | Radiation refrigeration power measuring device and system |
| CN111879816A (en) * | 2020-06-29 | 2020-11-03 | 宁波瑞凌新能源科技有限公司 | Radiation refrigeration power measuring device and system |
| CN113063720A (en) * | 2021-03-11 | 2021-07-02 | 厦门理工学院 | Radiation refrigeration performance testing device |
-
2020
- 2020-03-10 CN CN202010163000.9A patent/CN111272811A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487283A (en) * | 2020-06-29 | 2020-08-04 | 宁波瑞凌新能源科技有限公司 | Radiation refrigeration power measuring device and system |
| CN111879816A (en) * | 2020-06-29 | 2020-11-03 | 宁波瑞凌新能源科技有限公司 | Radiation refrigeration power measuring device and system |
| CN111879816B (en) * | 2020-06-29 | 2023-08-22 | 宁波瑞凌新能源科技有限公司 | Device and system for measuring radiation refrigeration power |
| CN113063720A (en) * | 2021-03-11 | 2021-07-02 | 厦门理工学院 | Radiation refrigeration performance testing device |
| CN113063720B (en) * | 2021-03-11 | 2023-07-25 | 厦门理工学院 | Radiation refrigeration performance testing device |
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