GB/T 43820-2024 English PDF (GB/T43820-2024)

GB/T 43820-2024: Textiles - Textiles containing phase change materials - Determination of the heat storage and release capacity
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GB/T 43820-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles – Textiles Containing Phase Change Materials –
Determination of the Heat Storage and Release Capacity
ISSUED ON. MARCH 15, 2024
IMPLEMENTED ON. OCTOBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Principle... 5
5 Equipment and Materials... 5
6 Preparation of Specimen... 6
7 Test Procedures... 7
8 Calculation and Expression of Results... 8
9 Test Report... 10
Bibliography... 11
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China National Textile and Apparel Council.
This Document shall be under the jurisdiction of National Technical Committee on Textiles of
Standardization Administration of China (SAC/TC 209).
Drafting organizations of this Document. Chinatesta Textile Testing and Certification Services
Co., Ltd.; Beijing YOTO Phase Change Energy Storage Technology Co., Ltd.; Bosideng Down
Garment Co., Ltd.; Aimer Co., Ltd.; Xiamen Baoli Trading Co., Ltd.; Shaoxing Lanzhiyin
Home Textile Co., Ltd.; Fujian Changle Hanggang Textile Co., Ltd.; Fujian Maitefu
Technology Development Co., Ltd.; Ningbo Customs District Technology Center; Shantou
Yuejia Textile Co., Ltd.; Xinxiang Chemical Fiber Co., Ltd.; Shaoxing Evergreen Knitting Co.,
Ltd.; Phase Change Energy Storage (Beijing) Technology Co., Ltd.; Lerune (Qingdao) Textile
Technology Co., Ltd.; Li-Ning (China) Sports Goods Co., Ltd.; Youngor Garment
Manufacturing Co., Ltd.; Qingdao Bangte Ecological Textile Technology Co., Ltd.; Haixi New
Textile Materials Industrial Technology Jinjiang Research Institute; Huzhou Xinnanhai
Weaving Factory; Shandong Hongju Textile Co., Ltd.; Zhejiang Manzi Socks Co., Ltd.;
Qingdao Yimei Fashion International Trade Co., Ltd.; and Dongguan Yichang Plastics Textile
Co., Ltd.
Chief drafting staffs of this Document. Wang Shouyu, Yan Chunhong, Zheng Yuanyuan, Zhang
Qingying, Lv Jing, Wang Jingjing, Du Tuping, Fu Kejie, Dong Chenguang, Gao Shuo, Xie
Yueting, Ren Qingqing, Zheng Xiaojia, Li Chenhong, Zhang Kejia, Wang Qingmiao, Shan
Chuanlei, Pan Yu, Ke Yonghui, Xu Baoli, Zhu Bangjie, Wu Dawei, Zheng Yunbo, Xing
Shanjing, Wang Xin, Wu Zhirong, Yao Ruimin, Liu Xinjiang, Wang Yiyi, Wang Yefei, Zhang
Jianzheng, Zhong Chulong, and Liu Wei.
Textiles – Textiles Containing Phase Change Materials –
Determination of the Heat Storage and Release Capacity
1 Scope
This Document describes the method for determining the heat storage and release capacity of
textiles containing phase change materials using differential scanning calorimetry (DSC).
This Document is applicable to all types of textiles containing phase change materials.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 4669-2008 Textiles - Woven fabrics - Determination of mass per unit length and
mass per unit area
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Phase change material
A material that can absorb or release heat in the form of latent heat within the temperature range
where the material undergoes phase change, thereby buffering changes in external temperature.
3.2 Phase change temperature
The peak temperature at which the phase change material undergoes a phase change, i.e. the
melting phase transition temperature or the crystallization phase transition temperature.
NOTE. Ideally, these two temperatures are the same; but since mixed materials are usually used, there is
a difference between the two in actual testing.
3.3 Extrapolated onset temperature
The temperature on a DSC curve corresponding to the intersection of the extrapolated baseline
and the tangent line drawn at the point of maximum slope of the curve corresponding to the
onset of transition.
3.4 Peak temperature
The temperature corresponding to the maximum (or minimum) value of a peak on a DSC curve.
3.5 Extrapolated end temperature
The temperature on a DSC curve corresponding to the intersection of the extrapolated baseline
and the tangent line drawn at the point of maximum slope of the curve corresponding to the end
of the transition.
3.6 Enthalpy of phase change
The amount of heat (J/g) absorbed or released by a phase change material during phase change
at constant pressure.
NOTE. The heat absorbed during melting is called melting enthalpy; and the heat released during
crystallization is called crystallization enthalpy.
4 Principle
Under the specified atmosphere and program temperature control, the relationship of the heat
flow rate difference, as the change in temperature and/or time, between the input sample and
the reference sample is measured, so that the melting temperature, melting enthalpy,
crystallization temperature, and crystallization enthalpy of the specimen can be obtained. The
melting temperature and melting enthalpy are used to characterize the phase change heat storage
capacity of the specimen; and the crystallization temperature and crystallization enthalpy are
used to characterize the heat release capacity.
5 Equipment and Materials
5.1 Differential scanning calorimeter and its accessories shall meet the following requirements.
a) It can heat or cool at a constant rate of 0.5 ℃/min~20 ℃/min.
b) It can keep the test temperature constant with a variation of no more than ±0.5 ℃.
c) It can perform segmented program heating.
d) The gas flow rate range is 10 mL/min~50 mL/min, and the deviation is controlled within
the range of ±10%.
For fibers and yarns, randomly cut the specimen taken at multiple points in different parts of
the sample; cut it into pieces and mix it evenly; take no less than 5 mg as one specimen; and
prepare 3 specimens in total. If the coefficient of variation (CV value) of the results of the 3
specimens is too large (see 7.8), 2 new specimens shall be prepared again for testing.
6.2.3 Fabric
Calculate the mass per unit area according to method 5 in 3.3 of GB/T 4669-2008.Cut several
specimens at different points of the sample at random, so that the total mass is no less than 5
mg, and take this combined sample as one specimen; and prepare three specimens in total. If
the CV value of the three specimens is too large (see 7.8), two new specimens shall be prepared
again for testing.
For samples with multi-layer structure, complex structure, and large regional differences,
samples shall be taken separately for testing, and the results shall be reported.
6.2.4 Flakes
Calculate the mass per unit area according to method 5 in 3.3 of GB/T 4669-2008.Cut several
specimens at different points of the sample at random, so that the total mass is no less than 5
mg, and take this combined sample as one specimen; and prepare three specimens in total. For
thicker samples, cut them along the thickness direction and then cut them into pieces and mix
them evenly. Randomly take a sample with a mass of no less than 5 mg as one specimen. Prepare
specimens again in different parts in the same way; and prepare a total of 3 specimens. If the
CV value of the 3 specimens is too large (see 7.8), 2 specimens shall be prepared again for
testing.
7 Test Procedures
7.1 Turn on the power of the differential scanning calorimeter and preheat it for at least 30 min.
7.2 Use tweezers or other suitable tools to place the sample dish containing the specimen and
the reference sample into the sample holder, respectively, ensuring that the sample dish
containing the specimen and the reference sample are in good contact with the holder; and then
cover the sample holder.
7.3 Before starting the program temperature control operation, pre-clean with nitrogen for 5
min.
7.4 Set the instrument program; run the heating program; and make the differential scanning
calorimeter heat up from -20 ℃ (usually 50 ℃ lower than the expected crystallization
temperature) at a rate of 5 ℃/min and record it; heat to 60 ℃ (usually about 30 ℃ higher than
the expected melting extrapolated end temperature); and keep the temperature constant for 5
min.
7.5 Run the cooling program, cool down to -20 ℃ at a rate of 5 ℃/min and record it; and keep
the temperature constant for 5 min.
7.6 Run the second heating program; heat up to 60 ℃ again at a rate of 5 ℃/min and record it.
The limit temperature of heating and cooling can also be determined by agreement between the
parties concerned and noted in the report.
7.7 Cool the instrument to room temperature.
7.8 Repeat procedures from 7.2 to 7.7 for the remaining 2 specimens. If the CV value of the
test result exceeds 20%, another 2 specimens shall be tested.
8 Calculation and Expression of Results
8.1 Expression of enthalpy of phase change and characteristic temperature
Based on the DSC curve obtained in Clause 7, read the enthalpy of phase change and
characteristic temperature of each specimen, respectively (see Figure 1).
a) Based on the second heating curve, read the melting enthalpy ΔHm of the specimen, that
is, the area between the melting peak and the baseline, the result is accurate to 0.01 J/g;
and the melting peak temperature Tm1, the result is accurate to 0.01 ℃. If necessary, the
extrapolated melting onset temperature Tm2 and the extrapolated melting end temperature
Tm3 can also be read, the result is accurate to 0.01 ℃.
b) Based on the cooling curve, read the crystallization enthalpy ΔHc of the specimen, that is,
the area between the crystallization peak and the baseline, the result is accurate to 0.01
J/g; and the crystallization peak temperature Tc1, the result is accurate to 0.01 ℃. If
necessary, the extrapolated crystallization onset temperature Tc2 and the extrapolated
crystallization end temperature Tc3 can also be read, and the results are accurate to
0.01 °C.
The values of melting enthalpy and crystallization enthalpy are similar (the difference is
generally within 10%). If the two deviate greatly, check whether the points on both sides of the
melting peak or crystallization peak are on the same baseline. When multiple peaks appear on
the DSC curve, the results shall be expressed by the peak value and enthalpy value of a single
peak.
GB/T 43820-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles – Textiles Containing Phase Change Materials –
Determination of the Heat Storage and Release Capacity
ISSUED ON. MARCH 15, 2024
IMPLEMENTED ON. OCTOBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Principle... 5
5 Equipment and Materials... 5
6 Preparation of Specimen... 6
7 Test Procedures... 7
8 Calculation and Expression of Results... 8
9 Test Report... 10
Bibliography... 11
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China National Textile and Apparel Council.
This Document shall be under the jurisdiction of National Technical Committee on Textiles of
Standardization Administration of China (SAC/TC 209).
Drafting organizations of this Document. Chinatesta Textile Testing and Certification Services
Co., Ltd.; Beijing YOTO Phase Change Energy Storage Technology Co., Ltd.; Bosideng Down
Garment Co., Ltd.; Aimer Co., Ltd.; Xiamen Baoli Trading Co., Ltd.; Shaoxing Lanzhiyin
Home Textile Co., Ltd.; Fujian Changle Hanggang Textile Co., Ltd.; Fujian Maitefu
Technology Development Co., Ltd.; Ningbo Customs District Technology Center; Shantou
Yuejia Textile Co., Ltd.; Xinxiang Chemical Fiber Co., Ltd.; Shaoxing Evergreen Knitting Co.,
Ltd.; Phase Change Energy Storage (Beijing) Technology Co., Ltd.; Lerune (Qingdao) Textile
Technology Co., Ltd.; Li-Ning (China) Sports Goods Co., Ltd.; Youngor Garment
Manufacturing Co., Ltd.; Qingdao Bangte Ecological Textile Technology Co., Ltd.; Haixi New
Textile Materials Industrial Technology Jinjiang Research Institute; Huzhou Xinnanhai
Weaving Factory; Shandong Hongju Textile Co., Ltd.; Zhejiang Manzi Socks Co., Ltd.;
Qingdao Yimei Fashion International Trade Co., Ltd.; and Dongguan Yichang Plastics Textile
Co., Ltd.
Chief drafting staffs of this Document. Wang Shouyu, Yan Chunhong, Zheng Yuanyuan, Zhang
Qingying, Lv Jing, Wang Jingjing, Du Tuping, Fu Kejie, Dong Chenguang, Gao Shuo, Xie
Yueting, Ren Qingqing, Zheng Xiaojia, Li Chenhong, Zhang Kejia, Wang Qingmiao, Shan
Chuanlei, Pan Yu, Ke Yonghui, Xu Baoli, Zhu Bangjie, Wu Dawei, Zheng Yunbo, Xing
Shanjing, Wang Xin, Wu Zhirong, Yao Ruimin, Liu Xinjiang, Wang Yiyi, Wang Yefei, Zhang
Jianzheng, Zhong Chulong, and Liu Wei.
Textiles – Textiles Containing Phase Change Materials –
Determination of the Heat Storage and Release Capacity
1 Scope
This Document describes the method for determining the heat storage and release capacity of
textil...