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
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.
Contents of GB/T 43820-2024
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
