CN114354682A - Method and device for testing radiation cooling performance of textile - Google Patents
Method and device for testing radiation cooling performance of textile Download PDFInfo
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- CN114354682A CN114354682A CN202210015897.XA CN202210015897A CN114354682A CN 114354682 A CN114354682 A CN 114354682A CN 202210015897 A CN202210015897 A CN 202210015897A CN 114354682 A CN114354682 A CN 114354682A
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Abstract
The invention provides a method and a device for testing the radiation cooling performance of a textile, which simulate sunlight by using a low-power polyimide heating film or a xenon lamp to provide a heat source, respectively measure the temperature of an environment, the heat source and the radiation cooling textile, calculate the temperature difference and the radiation cooling power, and represent the radiation cooling performance of the textile. On one hand, a polyimide heating film is used for simulating a skin heat source through constant-temperature control, and a plurality of temperature measuring sensors are used for respectively measuring the temperature of the fabric, the heat source and the ambient temperature; on the other hand, a xenon lamp light source is used for simulating a sunning environment, and the multi-path temperature measuring sensor is used for respectively measuring the temperature of the fabric, the heat source and the environment; and (4) drawing a temperature change curve by comprehensively measuring the temperature data, calculating the temperature difference between the fabric and a heat source, and calculating the radiation cooling power of the textile. The method is suitable for representing the radiation cooling performance of the radiation cooling textiles prepared by different technical methods, unifies the test conditions and enhances the comparability of the performance of the similar products.
Description
Technical Field
The invention belongs to the technical field of functional textiles, and particularly relates to a method for testing the radiation cooling performance of a textile.
Background
Radiative cooling refers to the process by which an article dissipates thermal energy through radiation. With the trend of global warming, the living environment of human beings is seriously threatened, and the development of energy-saving and environment-friendly cooling technology is urgent. The radiation cooling material has attracted extensive attention of researchers at home and abroad due to the characteristics of radiation heat dissipation without consuming energy and the like.
Thermal radiation is one of the four ways that the body dissipates heat (conduction, convection, radiation and perspiration), and thus the use of thermal radiation is a promising strategy to achieve body cooling without the use of any energy input. Recently, Radiation Cooling Textile (RCT) is considered as a promising fabric for achieving high thermal comfort of the human body both indoors and outdoors. In the early development, the concept of RCT was primarily achieved by enhancing the infrared transmission of textile materials. After a while, researchers develop novel textiles by taking porous Polyethylene (PE) as a textile raw material, and the novel textiles can effectively cool the human body and achieve excellent thermal comfort. Furthermore, infrared transparent materials are successively used to manufacture RCTs.
However, the reported radiant cooling materials and articles thereof, particularly the radiant cooling textiles, have not formed a standardized and effective method for evaluating the performance of radiant cooling. In one aspect, the radiative cooling capacity of a material is reflected by the spectral properties of the material. Since the actual cooling capacity of a material is directly related to its own solar spectrum reflection properties and atmospheric window emission properties. Therefore, the reflectivity (0.3-2.5 μm) and emissivity (8-13 μm) can be used as a measure of the cooling performance of the material, and are relatively mature in both equipment and technology. On the other hand, the actual radiation refrigerating capacity of the material is often characterized in related researches by measuring the surface temperature of the material under the condition of direct sunlight and calculating the temperature difference between the material and the environment. However, due to the variability of conditions such as temperature and humidity under actual weather conditions, the radiation cooling performance based on the temperature difference characterization is disturbed by various factors. In addition, the radiation cooling power is an effective means for evaluating the comprehensive performance of the radiation refrigeration material. It concerns the practical application potential of the material, the cost and budget of the material and the evaluation of the cooling performance of the different materials. However, the current radiation cooling power mostly adopts theoretical calculation to obtain theoretical radiation cooling power, and the radiation cooling power of the material is less actually measured.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art.
Therefore, the invention aims to provide a method for testing the radiation cooling performance of a textile.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions: a method for testing the radiation cooling performance of a textile comprises the following steps,
and detecting the simulated human body heat source radiation cooling performance of the textile and the simulated sun radiation cooling performance of the textile by using the radiation cooling performance testing device.
As a preferred embodiment of the method for testing the radiation cooling performance of the textile according to the present invention, wherein: also comprises the following steps of (1) preparing,
placing a fabric to be tested on a heating part by adopting a radiation cooling performance testing device, respectively placing temperature probes on the central surface of the heating part, the central surface of the fabric to be tested and a space 0.5cm away from the fabric to be tested, starting the heating part, respectively measuring the temperature of the fabric, the heating part and the environment within 120min after keeping the temperature of the heating part for 30min, respectively recording 1 time of temperature data by the temperature probe of a thermodetector every 1s, calculating the average temperature difference between the fabric and the heating part within 120min, and representing the radiation cooling performance of the heat source of the human body simulated by the textile by using an average temperature difference calculation formula 1;
the formula is as follows:
△Tathe average temperature difference between the fabric and the heating part is DEG C;
the average temperature of the surface of the fabric is measured at DEG C;
the average temperature of the surface of the heating film is measured at DEG C.
As a preferred embodiment of the method for testing the radiation cooling performance of the textile according to the present invention, wherein: also comprises the following steps of (1) preparing,
placing the fabric to be tested on the heating component by adopting a radiation cooling performance testing device, and respectively placing temperature probes on the central surface of the heating component, the central surface of the fabric to be tested and a space 0.5cm away from the fabric to be tested; respectively measuring the temperature of the fabric, the heating part and the environment within 120min under the condition that a xenon lamp is started, recording temperature data for 1 time every 1s by a temperature measuring probe of a temperature measuring instrument, calculating the average temperature difference between the fabric and the environment within 120min, and representing the simulated sun radiation cooling performance of the textile by an average temperature difference calculation formula 2;
the formula is as follows:
△Tbthe average temperature difference between the fabric and the environment is DEG C;
the average temperature of the surface of the fabric is measured at DEG C;
the ambient average temperature of the test, c.
As a preferred embodiment of the method for testing the radiation cooling performance of the textile according to the present invention, wherein: also comprises the following steps of (1) preparing,
placing a fabric to be tested on a heating part by adopting a radiation cooling performance testing device, respectively placing temperature probes on the central surface of the heating part, the central surface of the fabric to be tested and an upper space 0.5cm away from the fabric to be tested, starting the heating part, adjusting the temperature of the heating part to be consistent with the surface temperature of the fabric to be tested, measuring the power of the heating part by a digital power meter, and obtaining the actually measured radiation cooling power of the fabric to represent the simulated insolation radiation cooling performance of the textile by a calculation formula 3;
the formula is as follows:
Acooling＝Pheating/S
Acoolingis the radiant cooling power per unit area of the fabric, W/m2；PheatingMeasuring the electric power when the heating member is turned on; s is the area of the heating film, m2。
As a preferred embodiment of the method for testing the radiation cooling performance of the textile according to the present invention, wherein: the surface temperature of the measured fabric is the average temperature of the measured fabric under the irradiation of a xenon lamp within 120 min.
The home-made radiation cooling performance testing device used as the testing method for the radiation cooling performance of the textile is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the box body assembly (100) comprises a heat preservation test box body (101), a heating part (102), a temperature probe 1(103), a temperature probe 2(104), a temperature probe 3(105) and a xenon lamp (106), wherein the heating part (102) is arranged at the bottom in the heat preservation test box body (101), and the xenon lamp (106) is arranged above the heat preservation test box body (101);
a digital component (200) which comprises a microcomputer digital temperature controller (201), a digital power meter (202), a direct current power supply (203) and a multi-channel temperature tester (204), the digital power meter (202) extends into the heat insulation test box body (101) through a lead and is connected with a lead at the tail part of the heating part (102), the lead at the tail part of the heating part (102) extends out of the heat insulation test box body (101) and is connected with a microcomputer digital temperature controller (201), the direct current power supply (203) extends into the heat insulation test box body (101) through a lead and is connected with the tail lead of the heating part (102), the multi-path temperature tester (204) provides a temperature probe 1(103), a temperature probe 2(104) and a temperature probe 3(105) which go deep into the heat preservation test box body (101) through leads and are respectively arranged on the central surface of the heating part (102), the central surface of the fabric to be tested and the space above the fabric to be tested, wherein the distance between the central surface of the fabric to be tested and the space is 0.5 cm.
As a preferable scheme of the homemade radiation cooling performance testing device of the present invention, wherein: the heat preservation test box body (101) comprises a polypropylene foaming material with the thickness of not less than 4cm at the periphery.
As a preferable scheme of the homemade radiation cooling performance testing device of the present invention, wherein: the heating component (102) comprises a circular polyimide heating film with the voltage of 1-24V, the power of 1-10W and the diameter of 40 mm;
the polyimide heating film is composed of 2 polyimide films serving as outer insulators, a nickel-chromium alloy etching heating sheet serving as an inner conductive heating body is arranged in the middle of each polyimide film, the heating film body with a composite structure is formed by hot-pressing compounding at 250 ℃, and a lead is welded at the tail of the heating sheet exposed out of the heating film body to form the polyimide heating film with the designed power.
As a preferable scheme of the homemade radiation cooling performance testing device of the present invention, wherein: the xenon lamp (106) adopts an AM1.5 optical filter, so that the surface light power of the fabric to be measured is 50-300mW/cm2。
As a preferable scheme of the homemade radiation cooling performance testing device of the present invention, wherein: the microcomputer digital temperature controller (201) sets the constant temperature to be 35-39 ℃.
In order to ensure the accuracy of the test result of the test device, the heat-insulation test box body is made of polypropylene foaming material and has the thickness not less than 4 cm; a microcomputer digital temperature controller, the control precision is 0.1 ℃, and the refreshing frequency is 4 times/second; the multi-channel temperature tester has the resolution of 0.1 ℃ and the data recording interval of 1 second; a temperature measurement sensing probe adopts a K-type thermocouple, and the measurement precision is +/-0.8 ℃; a digital power meter with power ranging from 0.001W to 900W; the actual optical power of the xenon lamp illumination is calibrated by an optical power meter.
The invention has the beneficial effects that:
the invention provides a method for testing the radiation cooling performance of a textile. Through self-control radiation cooling performance testing arrangement, can survey and solve material and heat source, the average difference in temperature of material and environment, realize the radiation cooling performance evaluation of fabrics under the multiple heat source condition. By the self-made radiation cooling performance testing device, visual radiation cooling power can be obtained, and the radiation cooling performance of the textile can be comprehensively evaluated. The method for testing the radiation cooling performance of the textile carries out standardized setting on the operation steps and the test conditions, enhances the comparability of the radiation cooling performance of the similar materials, and is suitable for evaluating the radiation cooling performance of various materials.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
figure 1 is a plot of the fluctuation of cotton standard patch fabric, polyimide heating film, and ambient temperature data during the test of example 1.
FIG. 2 is a plot of the fluctuation of 5% ethylcellulose coating film, polyimide heating film, and ambient temperature data during the test of example 2.
FIG. 3 is a graph of the fluctuation of 5% ethylcellulose-coated cotton fabric, polyimide heating film, and ambient temperature data during the test of example 3.
FIG. 4 is a plot of the 10% ethylcellulose coating film, polyimide heating film and ambient temperature data fluctuation during the test of example 4.
Figure 5 is a graph of the fluctuation of wool standard patch fabric, polyimide heating film, and ambient temperature data during the test of example 5.
Figure 6 is a graph of the fluctuation of wool standard patch fabric and ambient temperature data during the test of example 6.
FIG. 7 is a plot of the 5% ethylcellulose coating film and ambient temperature data fluctuation during the test of example 7.
FIG. 8 is a plot of the 10% ethylcellulose coating film and ambient temperature data fluctuation during the test of example 8.
Fig. 9 is a schematic view of a radiation cooling performance test device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The polyimide heating film used in the embodiment of the invention is prepared by a laboratory, and the preparation method comprises the following steps: cutting a polyimide film with a proper shape and size (circular, diameter 45mm) into 2 pieces of outer insulators, arranging a nickel-chromium alloy etching heating sheet in the middle of the polyimide film as an inner conductive heating body, performing hot-pressing compounding at high temperature (250 ℃) to form a heating film body with a composite structure, and welding a lead at the tail part of the heating sheet exposed out of the heating film body to form a polyimide heating film device with designed power.
Example 1:
taking a round cotton standard pasting fabric with the diameter of 40mm, and covering the round cotton standard pasting fabric on a polyimide heating film (the specification diameter is 40mm, 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); setting the temperature of a microcomputer digital temperature controller to be 36 ℃; and (3) switching on a direct current power supply, heating the heating film for 30min, and recording temperature data of each temperature probe within 120min, as shown in figure 1. Through calculation, in the test process, the average value of the temperature difference between the cotton fabric and the heating film is-3.7 ℃, which shows that the cotton fabric has the heat preservation effect but does not have obvious radiation cooling performance under the simulated human body heating state.
Example 2:
taking a coating film sample formed by circular 5% ethyl cellulose with the diameter of 40mm, and covering the coating film sample on a polyimide heating film (with the specification diameter of 40mm and 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); setting the temperature of a microcomputer digital temperature controller to be 35 ℃; and (3) switching on a direct current power supply, heating the heating film for 30min, and recording temperature data of each temperature probe within 120min, as shown in figure 2. Through calculation, in the test process, the average value of the temperature difference between the 5% ethyl cellulose coating and the heating film is 1.8 ℃, which shows that the surface temperature of the 5% ethyl cellulose coating is higher than that of the heating film under the simulated human body heating state, and the heating film has certain radiation cooling performance.
Example 3:
taking a circular cotton fabric with the diameter of 40mm and containing 5% of ethyl cellulose coating, and covering the cotton fabric on a polyimide heating film (the specification diameter is 40mm, 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); setting the temperature of a microcomputer digital temperature controller to be 35 ℃; and (3) switching on a direct current power supply, heating the heating film for 30min, and recording temperature data of each temperature probe within 120min, as shown in figure 3. Through calculation, the average temperature difference between the 5% ethyl cellulose coated cotton fabric and the heating film in the test process is 1.9 ℃. By combining the example 2, the result shows that the 5% ethyl cellulose coated cotton fabric has a certain radiation cooling performance similar to that of a pure 5% ethyl cellulose coating under the simulated human body heating state, and the radiation cooling performance of the cotton fabric is greatly improved compared with that of the example 1.
Example 4:
taking a coating film sample formed by circular 10% ethyl cellulose with the diameter of 40mm, and covering the coating film sample on a polyimide heating film (with the specification diameter of 40mm and 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); setting the temperature of a microcomputer digital temperature controller to be 35 ℃; and (3) switching on a direct current power supply, heating the heating film for 30min, and recording temperature data of each temperature probe within 120min, as shown in figure 4. The average temperature difference between the 10% ethylcellulose coating and the heated film during the test was calculated to be 3.1 ℃. In combination with example 2, it is shown that the 10% ethylcellulose coating has better radiant cooling properties than the 5% ethylcellulose coating in a simulated human body fever state.
Example 5:
covering a circular wool standard pasting fabric with the diameter of 40mm on a polyimide heating film (the specification diameter is 40mm, 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); setting the temperature of a microcomputer digital temperature controller to be 36 ℃; after the direct current power supply is switched on and the heating film is heated for 30min, the temperature data of each temperature measuring probe within 120min is recorded, as shown in figure 5. Through calculation, the average value of the temperature difference between the cotton fabric and the heating film is-4.8 ℃ in the testing process. Compared with the embodiment 1, the wool fabric has better heat preservation effect than cotton fabric under the simulated human body heating state, and also has no radiation cooling performance.
Example 6:
covering a circular wool standard pasting fabric with the diameter of 40mm on a polyimide heating film (the specification diameter is 40mm, 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); starting a xenon lamp (AM1.5 optical filter), and adjusting the surface light power of the fabric to be measured to be 100mW/cm2(ii) a After the xenon lamp is irradiated for 30min, the temperature probe 2 and the temperature probe are recordedTemperature data of the head 3 during 120min, as shown in fig. 6. Through calculation, in the test process, the average value of the temperature difference between the wool fabric and the environment is 0.3 ℃, which shows that the wool fabric basically has no radiation cooling performance under the simulated sun-drying condition.
Example 7:
taking a circular 5% ethyl cellulose coating film with the diameter of 40mm, and covering the circular 5% ethyl cellulose coating film on a polyimide heating film (with the specification diameter of 40mm and 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); starting a xenon lamp (AM1.5 optical filter), and adjusting the surface light power of the fabric to be measured to be 100mW/cm2(ii) a After the xenon lamp is irradiated for 30min, the temperature data of the temperature probe 2 and the temperature probe 3 within 120min are recorded, as shown in fig. 7. Through calculation, in the test process, the average value of the temperature difference between the 5% ethyl cellulose coating and the environment is-1.5 ℃, which shows that the 5% ethyl cellulose coating has the radiation cooling performance under the simulated sun-drying condition. Starting a polyimide heating film, adjusting a direct-current power supply, monitoring through a probe 1 to enable the heating film to be constant in temperature of 36 ℃, and recording electric power parameters; the radiation cooling power of the 5% ethylcellulose coating is 27.1W/m2。
Example 8:
taking a circular 10% ethyl cellulose coating film with the diameter of 40mm, and covering the circular 10% ethyl cellulose coating film on a polyimide heating film (with the specification diameter of 40mm and 12v/2.5W) of a self-made radiation cooling measuring device; the position of a temperature measuring probe is adjusted (the probe 1 is arranged on the central surface of the heating film, the probe 2 is arranged on the central surface of the fabric to be measured, and the probe 3 is arranged in a space 0.5cm above the fabric to be measured); starting a xenon lamp (AM1.5 optical filter), and adjusting the surface light power of the fabric to be measured to be 300mW/cm2(ii) a After the xenon lamp is irradiated for 30min, the temperature data of the temperature probe 2 and the temperature probe 3 within 120min are recorded, as shown in FIG. 8. Through calculation, in the test process, the average value of the temperature difference between the 10% ethyl cellulose coating and the environment is-5.1 ℃, which shows that the 10% ethyl cellulose coating has the radiation cooling performance under the simulated sun-drying condition. The polyimide heating film is started, the direct current power supply is adjusted, and the probe 1 is used for monitoring to ensure that the heating film is constantRecording electric power parameters at the temperature of 41 ℃; the radiation cooling power of the 10% ethylcellulose coating at this time was calculated to be 81.4W/m2。
Example 9
The samples of examples 1-5 were each tested in 10 replicates according to the procedure of examples 1-5, and the results of the temperature difference test, the standard deviation and the relative standard deviation in 10 replicates are shown in Table 1. The standard deviations calculated from 5 sets of 10 replicates were found to be all small, indicating a better method reproducibility of the test method. And 5 groups of tests are repeated for 10 times, and the relative standard deviation is less than or equal to 5 percent, which shows that the result obtained by the test method has higher precision.
TABLE 1
The invention provides a method and a device for testing the radiation cooling performance of a textile. Through self-control radiation cooling performance testing arrangement, can survey and solve material and heat source, the average difference in temperature of material and environment, realize the radiation cooling performance evaluation of fabrics under the multiple heat source condition. By the self-made radiation cooling performance testing device, visual radiation cooling power can be obtained, and the radiation cooling performance of the textile can be comprehensively evaluated. The method for testing the radiation cooling performance of the textile carries out standardized setting on the operation steps and the test conditions, enhances the comparability of the radiation cooling performance of the similar materials, and is suitable for evaluating the radiation cooling performance of various materials.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A method for testing the radiation cooling performance of textiles is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
and detecting the simulated human body heat source radiation cooling performance of the textile and the simulated sun radiation cooling performance of the textile by using the radiation cooling performance testing device.
2. A method for testing the radiant cooling performance of a textile according to claim 1, wherein: also comprises the following steps of (1) preparing,
placing a fabric to be tested on a heating part by adopting a radiation cooling performance testing device, respectively placing temperature probes on the central surface of the heating part, the central surface of the fabric to be tested and a space 0.5cm away from the fabric to be tested, starting the heating part, respectively measuring the temperature of the fabric, the heating part and the environment within 120min after keeping the temperature of the heating part for 30min, respectively recording 1 time of temperature data by the temperature probe of a thermodetector every 1s, calculating the average temperature difference between the fabric and the heating part within 120min, and representing the radiation cooling performance of the heat source of the human body simulated by the textile by using an average temperature difference calculation formula 1;
the formula is as follows:
△Tathe average temperature difference between the fabric and the heating part is DEG C;
the average temperature of the surface of the fabric is measured at DEG C;
the average temperature of the surface of the heating film is measured at DEG C.
3. A method for testing the radiant cooling performance of a textile according to claim 1, wherein: also comprises the following steps of (1) preparing,
placing the fabric to be tested on the heating component by adopting a radiation cooling performance testing device, and respectively placing temperature probes on the central surface of the heating component, the central surface of the fabric to be tested and a space 0.5cm away from the fabric to be tested; respectively measuring the temperature of the fabric, the heating part and the environment within 120min under the condition that a xenon lamp is started, recording temperature data for 1 time every 1s by a temperature measuring probe of a temperature measuring instrument, calculating the average temperature difference between the fabric and the environment within 120min, and representing the simulated sun radiation cooling performance of the textile by an average temperature difference calculation formula 2;
the formula is as follows:
△Tbthe average temperature difference between the fabric and the environment is DEG C;
the average temperature of the surface of the fabric is measured at DEG C;
the ambient average temperature of the test, c.
4. A method for testing the radiant cooling performance of a textile according to claim 1, wherein: also comprises the following steps of (1) preparing,
placing a fabric to be tested on a heating part by adopting a radiation cooling performance testing device, respectively placing temperature probes on the central surface of the heating part, the central surface of the fabric to be tested and an upper space 0.5cm away from the fabric to be tested, starting the heating part, adjusting the temperature of the heating part to be consistent with the surface temperature of the fabric to be tested, measuring the power of the heating part by a digital power meter, and obtaining the actually measured radiation cooling power of the fabric to represent the simulated insolation radiation cooling performance of the textile by a calculation formula 3;
the formula is as follows:
Acooling＝Pheating/S
Acoolingis a unit surface of a fabricVolumetric radiation cooling power, W/m2；PheatingMeasuring the electric power when the heating member is turned on; s is the area of the heating film, m2。
5. A method for testing the radiant cooling performance of a textile according to claim 4, wherein: the surface temperature of the measured fabric is the average temperature of the measured fabric under the irradiation of a xenon lamp within 120 min.
6. A home-made radiation cooling performance testing device for a textile radiation cooling performance testing method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the box body assembly (100) comprises a heat preservation test box body (101), a heating part (102), a temperature probe 1(103), a temperature probe 2(104), a temperature probe 3(105) and a xenon lamp (106), wherein the heating part (102) is arranged at the bottom in the heat preservation test box body (101), and the xenon lamp (106) is arranged above the heat preservation test box body (101);
a digital component (200) which comprises a microcomputer digital temperature controller (201), a digital power meter (202), a direct current power supply (203) and a multi-channel temperature tester (204), the digital power meter (202) extends into the heat insulation test box body (101) through a lead and is connected with a lead at the tail part of the heating part (102), the lead at the tail part of the heating part (102) extends out of the heat insulation test box body (101) and is connected with a microcomputer digital temperature controller (201), the direct current power supply (203) extends into the heat insulation test box body (101) through a lead and is connected with the tail lead of the heating part (102), the multi-path temperature tester (204) provides a temperature probe 1(103), a temperature probe 2(104) and a temperature probe 3(105) which go deep into the heat preservation test box body (101) through leads and are respectively arranged on the central surface of the heating part (102), the central surface of the fabric to be tested and the space above the fabric to be tested, wherein the distance between the central surface of the fabric to be tested and the space is 0.5 cm.
7. The homemade radiation cooling performance test device of claim 6, wherein: the heat preservation test box body (101) comprises a polypropylene foaming material with the thickness of not less than 4cm at the periphery.
8. The homemade radiation cooling performance test device of claim 6, wherein: the heating component (102) comprises a circular polyimide heating film with the voltage of 1-24V, the power of 1-10W and the diameter of 40 mm;
the polyimide heating film is composed of 2 polyimide films serving as outer insulators, a nickel-chromium alloy etching heating sheet serving as an inner conductive heating body is arranged in the middle of each polyimide film, the heating film body with a composite structure is formed by hot-pressing compounding at 250 ℃, and a lead is welded at the tail of the heating sheet exposed out of the heating film body to form the polyimide heating film with the designed power.
9. The homemade radiation cooling performance test device of claim 6, wherein: the xenon lamp (106) adopts an AM1.5 optical filter, so that the surface light power of the fabric to be measured is 50-300mW/cm2。
10. The homemade radiation cooling performance test device of claim 6, wherein: the microcomputer digital temperature controller (201) sets the constant temperature to be 35-39 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112903749A (en) * | 2021-03-15 | 2021-06-04 | 上海安凸塑料添加剂有限公司 | Multifunctional textile photo-thermal conversion heating and warming performance tester and application thereof |
| KR20210108231A (en) * | 2020-02-25 | 2021-09-02 | 재단법인 에프아이티아이시험연구원 | Test equipment to evaluate the performance of cold fabric |
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| KR20150003102A (en) * | 2013-06-27 | 2015-01-08 | 주식회사 에이디엘코리아 | Warmth analysis system of clothes |
| CN104316557A (en) * | 2014-10-10 | 2015-01-28 | 东华大学 | Temperature variation sensing and index calculating method of textiles |
| US20170016839A1 (en) * | 2015-07-17 | 2017-01-19 | Alexander Rubenchik | System and method for the direct calorimetric measurement of laser absorptivity of materials |
| CN206339508U (en) * | 2016-12-16 | 2017-07-18 | 上海出入境检验检疫局工业品与原材料检测技术中心 | A kind of sunshine textiles test device |
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| CN109632874A (en) * | 2018-12-24 | 2019-04-16 | 南京林业大学 | A kind of garment material insulation property testing device for heat preservation and test method |
| KR20210108231A (en) * | 2020-02-25 | 2021-09-02 | 재단법인 에프아이티아이시험연구원 | Test equipment to evaluate the performance of cold fabric |
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