Textiles - Textiles containing phase change materials - Determination of the heat storage and release capacity
1 Scope
This document describes a 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 kinds of textiles containing phase change materials.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
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 absorbs or releases heat energy in the form of latent heat within the temperature range at which the phase state of the material changes, thereby buffering the external temperature changes
3.2
phase change temperature
peak temperature at which phase change occurs in phase change materials, namely the phase change temperature during melting or crystallization
Note: Ideally, these two temperatures are the same, but there are differences in actual tests due to the common use of mixed materials.
3.3
extrapolated onset temperature
temperature corresponding to the intersection point of the extrapolated baseline on the DSC curve and the tangent at the maximum slope of the curve corresponding to the beginning of the transition
3.4
peak temperature
temperature corresponding to the maximum (or minimum) peak on the DSC curve
3.5
extrapolated end temperature
temperature corresponding to the intersection point of the extrapolated baseline on the DSC curve and the tangent at the maximum slope of the curve corresponding to the end of the transition
3.6
enthalpy of phase change
heat (J/g) absorbed or released by phase change materials during phase change under constant pressure
Note: The heat absorbed during melting is called enthalpy of melting. The heat released during crystallization is called enthalpy of crystallization.
4 Principle
Under the control of prescribed atmosphere and programmed temperature, the relationship between the heat flux rate difference between the input specimen and the reference specimen as a function of temperature and/or time 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 melting value are used to characterize the heat release capacity of the specimen.
Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Equipment and materials 6 Specimen preparation 7 Test steps 8 Calculation and expression of results 9 Test report
ICS 59.080.01 CCS W 04
中华人民共和国国家标准 GB/T 43820-2024
纺织品 含相变材料的纺织品 蓄热和放热性能的测定
Textiles - Textiles containing phase change materials - Determination of the heat storage and release capacity
下列术语和定义适用于本文件。 3.1 相变材料phase change material 在材料发生相态变化的温度范围内，能够以潜热的形式吸收或释放热能，从而缓冲外界温度变化的材料。 3.2 相变温度phase change temperature 相变材料发生相态变化的峰温度,即熔融相变温度或结晶相变温度. 注:理想情况下，这两个温度是相同的，但由于通常使用的为混合材料,实际测试中两者存在差异。 3.3 外推起始温度extrapolated onset temperature DSC曲线上外推基线与对应于转变开始的曲线最大斜率处所作切线的交点所对应的温度。 3.4 峰温度peak temperature DSC曲线上峰达到的最大值(或最小值)所对应的温度。 3.5 外推终止温度extrapolated end temperature DSC曲线上外推基线与对应于转变结束的曲线最大斜率处所作切线的交点所对应的温度。 3.6 焓值enthalpy of phase change 恒压下,相变材料在发生相态变化过程中所吸收或释放的热量(J/g)。 注:熔融时所吸收的热量称为熔融焓.结晶时所释放的热量称为结晶焓。
