CN112816519A - Device and method for measuring comprehensive performance of photo-thermal fabric - Google Patents
Device and method for measuring comprehensive performance of photo-thermal fabric Download PDFInfo
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- CN112816519A CN112816519A CN202011587487.XA CN202011587487A CN112816519A CN 112816519 A CN112816519 A CN 112816519A CN 202011587487 A CN202011587487 A CN 202011587487A CN 112816519 A CN112816519 A CN 112816519A
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- 239000004744 fabric Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 229910052724 xenon Inorganic materials 0.000 claims description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical group [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000013256 coordination polymer Substances 0.000 claims description 2
- 230000003028 elevating effect Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 229920000742 Cotton Polymers 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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 provides a device and a method for measuring comprehensive performance of a photo-thermal fabric. The invention provides a device and a method for measuring the comprehensive performance of a photo-thermal fabric, which can obtain the heat exchange coefficient and the photo-thermal conversion coefficient of the photo-thermal fabric, are beneficial to more objective and fair evaluation of the comprehensive performance of the photo-thermal fabric, and promote the performance improvement of related products and the popularization of high-quality products.
Description
Technical Field
The invention relates to the technical field of textile detection, in particular to a device and a method for measuring comprehensive performance of a photo-thermal fabric.
Background
With the development of science and technology, the requirement of people on the warmth retention property of clothes gradually becomes higher. It is desirable to have a more insulating fabric to reduce the weight of the garment and to increase the functionality and aesthetics of the garment. The light absorption heating fabric (called photo-thermal fabric for short) absorbs light energy (mainly sunlight) through fibers of the fabric and converts the light energy into heat energy, so that the aim of actively heating a human body is fulfilled.
In recent years, the research on the related field of photo-thermal fabrics is few, but the measurement and evaluation on the performance of the photo-thermal fabrics are few mainly focusing on how to obtain the light-absorbing heating fabrics. The existing photothermal fabric evaluation system is mainly based on a test method for the light and heat storage performance of a textile in national standard GB/T18319 and 2019, provides a detailed test specification, and people can judge whether the textile has the light and heat storage performance according to whether the maximum temperature rise value and the average temperature rise value obtained by the test meet the requirements.
However, the main evaluation parameter of the national standard GB/T18319-2019 is a temperature variable, the parameter ignores the influence of time in the whole implementation process, and has no way to reflect the highest temperature of a sample which can be obtained under a specific environment, and the evaluation of the performance between different photo-thermal fabrics lacks a corresponding system, which obviously influences the objective and fair evaluation of the photo-thermal fabrics.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for measuring the comprehensive performance of a photo-thermal fabric, so that the comprehensive performance of the photo-thermal fabric can be objectively and fairly evaluated, and the performance improvement of related products and the popularization of high-quality products are promoted.
The invention adopts the following technical scheme:
the invention provides a device for measuring comprehensive performance of a photo-thermal fabric, which comprises a temperature monitor, a light source emitter, a sample table and a light intensity tester, wherein the temperature monitor is an infrared camera and monitors and records the temperature of a sample to be tested on the sample table under different illumination time.
In the prior art, only the temperature of a specific site can be obtained by measuring the temperature by using two temperature sensors, and errors are easily caused. The invention adopts the infrared camera as the temperature monitor, and firstly, the temperature of each point of the sample to be measured can be obtained, thereby averagely calculating the temperature of the sample and ensuring that the data is more reliable; the invention has non-contact measurement, the infrared camera does not need to contact or approach the sample to be measured, the error caused by temperature rise due to illumination of the temperature monitor in the measurement process can be avoided, and the precision is better.
According to the device for measuring the comprehensive performance of the photo-thermal fabric, provided by the embodiment of the invention, the light source emitter is positioned right above the sample table, and the light source emitter is a xenon lamp. When the light source emitter is positioned right above the sample platform, namely the sample to be detected, the sample to be detected can be favorably and uniformly illuminated.
According to the device for measuring the comprehensive performance of the photo-thermal fabric, provided by the embodiment of the invention, the height of the sample table can be adjusted through the lifting mechanism. The lifting mechanism is arranged to adjust the height of the sample platform, so that the light intensity of the sample to be detected can be adjusted to a target value by matching with the light source emitter.
According to the device for measuring the comprehensive performance of the photo-thermal fabric, provided by the embodiment of the invention, the sample table is made of heat-insulating materials. The insulating material may be an insulating foam.
According to the device for measuring the comprehensive performance of the photo-thermal fabric, provided by the embodiment of the invention, the test site of the light intensity tester is positioned on the sample table and is close to the central position of a sample to be tested. The test site of the light intensity tester is as close to the central position of the sample to be tested as possible, which is beneficial to obtaining accurate surface illumination intensity of the sample to be tested.
The invention also provides a method for measuring the comprehensive performance of the photo-thermal fabric, which comprises the following steps: obtaining the temperature of the sample to be measured under the same illumination intensity and different illumination time, and then using a formula
Fitting is carried out, so that the heat exchange coefficient F and the photothermal conversion coefficient gamma of the sample to be detected are obtained through calculation;
wherein T is the temperature of the sample to be measured after illumination, T0Is the ambient temperature, P is the illumination radiation power, t is the illumination time, m is the sample mass to be measured, CPThe specific heat capacity of the sample to be measured.
The fitting formula is derived from the energy conservation formula 1 between the sample to be measured and the environment.
Wherein, P is the illumination radiation power, is controlled by a light source emitter and can be measured by a light intensity tester; γ is the photothermal conversion coefficient, which indicates how much energy from sunlight is absorbed by the sample in the form of thermal energy under the current environment and test conditions. This coefficient reflects the energy utilization of the sample, with the larger the coefficient, the better the performance.
Right middle of formula
Representing the energy absorbed by the sample at elevated temperature, m being the mass of the sample, CpFor the sample specific heat capacity, the specific heat capacity was provided in this experiment primarily by the pure cotton substrate, here taken as 1.275J/g C. T is the (current) temperature after the sample is illuminated, and T is the illumination time.
Which represents the energy lost by interaction between the sample and the environment, here dominated by convection. QEXIs the heat rejected.
Since heat is exchanged between the solid and the gas, the exchange mode is assumed to be mainly convection.
Can obtain the product
F is the heat exchange coefficient, T is the current temperature of the sample, T0Is ambient temperature. Substituting into the formula (1), and finishing to obtain
Is finished to obtain
This is as follows
A first order linear homogeneous equation with t as x, with the general solution being
By initializing the lighting conditions (T ═ T)0T ═ 0) can be obtained, a special solution to this equation is obtained,
obtaining a final fitting formula:
the method can obtain the heat exchange coefficient F and the photothermal conversion coefficient gamma of the photothermal fabric. The heat exchange coefficient F can reflect the interaction between the sample and the surrounding environment and reflect the highest temperature rise temperature of the sample in the environment; the photothermal conversion coefficient gamma can be used as an important parameter for evaluating a sample, and the greater the value of the photothermal conversion coefficient gamma, the less time is required for the photothermal fabric to be heated to the target temperature, and the better the photothermal conversion performance is. The invention provides a new reference standard for evaluation of photo-thermal fabrics, and can evaluate the performances of different photo-thermal fabrics more objectively and fairly.
Preferably, an infrared camera is used for obtaining the temperature of the sample to be detected under the same illumination intensity and different illumination time.
Further preferably, the infrared camera is located outside the light source irradiation area, and the imaging of the sample to be measured is located in the center of the camera screen.
Preferably, the illumination intensity is equal to the annual average solar radiation intensity of the test site. Therefore, the method is closer to the actual using condition of the sample to be tested, and the test result has more reference value.
The invention provides a device and a method for measuring the comprehensive performance of a photo-thermal fabric, which can obtain the heat exchange coefficient and the photo-thermal conversion coefficient of the photo-thermal fabric, are beneficial to more objective and fair evaluation of the comprehensive performance of the photo-thermal fabric, and promote the performance improvement of related products and the popularization of high-quality products.
Drawings
Fig. 1 is a schematic structural diagram of a device for measuring comprehensive properties of a photo-thermal fabric provided in embodiment 1 of the present invention;
wherein, 1-temperature monitor; 2-a light source emitter; 3-a sample to be tested; 4-a sample stage; 5-a lifting device; 6-light intensity tester; 7-a base;
FIG. 2 is a graph of temperature versus time for samples 1-6;
fig. 3 is a linear fit plot of growth time and corresponding photothermal conversion coefficient for the samples.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The photothermal fabric measured in the following embodiments of the invention is a metal nanoparticle-cotton fiber composite fabric, and the preparation method thereof is as follows:
step one, soaking the artificial cotton in 0.1 percent chloroauric acid solution for 4 hours, cleaning the artificial cotton for more than three times by using distilled water, and then adding 0.1mol/L NaBH4Reducing the solution for 3 minutes, and finally cleaning the solution for more than three times by using distilled water to prepare artificial cotton attached with gold nanoclusters;
and step two, soaking the artificial cotton attached with the gold nanoclusters in a copper-containing plating solution to grow copper nanoparticles in situ, and then washing the fabric with distilled water for more than three times to obtain the copper nanoparticle-cotton fiber composite fabric.
And in the second step, the growth time of the copper nanoparticles is respectively 0.5min, 1min, 1.5min, 3min, 5min and 7min, so that samples 1-6 are respectively prepared.
Example 1
The embodiment provides a device for measuring comprehensive performance of photo-thermal fabric, a schematic structural diagram of which is shown in fig. 1, and the device comprises a temperature monitor 1, a light source emitter 2, a sample table 4, a lifting device 5, a light intensity tester 6 and a base 7.
The temperature monitor 1 is an infrared camera, has functions of screen recording and corresponding software analysis, is set to be a region directly irradiated by the non-light source emitter 2, and enables an image of a sample 3 to be detected in the camera to be located in the center of the screen.
The light source emitter 2 is a xenon lamp, simulates sunlight and is positioned right above the sample platform 4.
The sample 3 to be measured is placed on the surface of the sample stage 4 in a flat state during measurement. The sample stage 4 is connected to a base 7 via a lifting device 5. The specimen mount 4 is an insulating foam.
The test site of the light intensity tester 6 is placed on the same horizontal line with the sample 3 to be tested, and is as close to the central position of the sample 3 to be tested as possible to obtain accurate illumination intensity of the surface of the sample 3 to be tested.
Example 2
The embodiment provides a method for measuring comprehensive performance of a photo-thermal fabric, which comprises the following steps:
step one, adopting the measuring device provided by the embodiment 1, placing a sample to be measured on a sample table, testing light intensity by using a light intensity tester, adjusting the height of a lifting table to adjust the light intensity of the surface of the sample, and enabling the light intensity of the surface of the sample to be 517W/m2And the average radiation intensity of the Shanghai in four seasons is close to the test.
And step two, recording the change curve of the sample temperature along with the time in the whole testing process by using an infrared camera and software, wherein the result is shown in figure 2, and marks 1, 2, 3, 4, 5 and 6 in the figure represent samples 1-6 respectively.
Step three, using y ═ y0+Aexp(R0X) formula was fitted to the data of figure 2. Wherein, y is T,
the samples were all 8 cm diameter circles with an area of 5.0265X 10-3m2P is 517W/m2*0.0050265m22.60W, heat capacity Cp1.275J/g C was taken. The fitting data were processed to obtain the results shown in table 1.
TABLE 1 sample fitting results
As can be seen from table 1, the heat exchange coefficients of all samples are relatively similar, and the difference is not large, and is mainly determined by the environment. Wherein y is0The maximum temperature rise of the sample in this environment can be reflected. The photothermal conversion coefficient γ of the sample increased with the copper plating time.
The growth time of the sample and the corresponding photothermal conversion coefficient were subjected to linear fitting to obtain a fitted graph shown in fig. 3. It can be seen from FIG. 3 that the photothermal conversion coefficient and the growth time of the sample form a good linear relationship, R2Is 0.96158. The photothermal component of the composite photothermal fabric is mainly determined by the copper nanoparticles in the fabric, and the copper nanoparticles are determined by the copper plating time. The longer the copper plating time, the greater the photothermal conversion coefficient of the sample, and the less time it takes to raise the same temperature.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The device for measuring the comprehensive performance of the photo-thermal fabric is characterized by comprising a temperature monitor, a light source emitter, a sample table and a light intensity tester, wherein the temperature monitor is an infrared camera and monitors and records the temperature of a sample to be tested on the sample table under different illumination time.
2. The device for measuring the comprehensive performance of the photothermal fabric according to claim 1, wherein the light source emitter is located right above the sample table, and the light source emitter is a xenon lamp.
3. The photothermal fabric comprehensive performance measuring device according to claim 1 or 2, wherein the sample stage is adjustable in height by an elevating mechanism.
4. The photothermal fabric comprehensive performance measuring device according to claim 3, wherein the sample stage is a heat insulating material.
5. The device for measuring the comprehensive performance of the photo-thermal fabric according to any one of claims 1 to 4, wherein a test site of the light intensity tester is positioned on the sample table and is close to the center of a sample to be tested.
6. A method for measuring comprehensive performance of photo-thermal fabric is characterized by comprising the following steps: obtaining the temperature of the sample to be measured under the same illumination intensity and different illumination time, and then using a formula
Fitting is carried out, so that the heat exchange coefficient F and the photothermal conversion coefficient gamma of the sample to be detected are obtained through calculation;
wherein T is the temperature of the sample to be measured after illumination, T0Is ambient temperature, P is the power of the illuminating radiationT is the illumination time, m is the sample mass to be measured, CPThe specific heat capacity of the sample to be measured.
7. The method for measuring the comprehensive performance of the photothermal fabric according to claim 6, wherein the temperature of the sample to be measured is obtained by using an infrared camera under the same illumination intensity and different illumination time.
8. The method for measuring the comprehensive performance of the photo-thermal fabric according to claim 7, wherein the infrared camera is positioned outside the light source irradiation area, and the condition that the image of the sample to be measured is positioned in the center of the camera screen is met.
9. The method for measuring the comprehensive performance of the photo-thermal fabric according to claim 6, wherein the illumination intensity is equal to the annual average solar radiation intensity of a test place.
10. The method for measuring the comprehensive performance of the photo-thermal fabric according to any one of claims 6 to 9, wherein the greater the photo-thermal conversion coefficient γ, the less time is used for the photo-thermal fabric to be raised to a target temperature, and the better the photo-thermal conversion performance is.
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| CN113376082A (en) * | 2021-06-08 | 2021-09-10 | 杭州老爸评测互动科技有限公司 | Method and system for measuring cooling performance of umbrella |
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