Sensory warmth with thermal effusivity: Applications to high performance textiles and correlations with q-max

Thermal Effusivity (Ws1/2/m2K) is the thermophysical property that dictates a materials ability to exchange thermal energy (heat) from another material it is in contact with. If the effusivity of the materials are known, the temperature “felt” at the interface can be determined. This is why as a metric, effusivity is used as a critical performance attribute in determining the thermal regulation properties of various textile materials. This allows groups to develop, characterize and market their products as either having “Warm Feel” or “Cool Touch” properties.

At present, the Modified Transient Plane Source (MTPS) is the only method available that provides a direct measurement of effusivity. The MTPS is a proprietary, single-sided sensor technology only available through C-Therm Technologies Ltd. (https://ctherm.com/products/tx-touch-experience-platform/). While other instruments may make similar claims, C-Therm’s MTPS is the only method that conforms to ASTM D7984 which has been globally adopted as the standard for quantifying thermal effusivity of fabrics for claims validation.

In this webinar we’ll review the principals of operation of the MTPS as is relates to fabrics characterization as well as help explain why a direct measurement of effusivity is crucial for the best overall understanding of a material’s thermal properties. We will also discuss other methods used for textile thermal characterization (Q-Max) and how this measurement correlates to effusivity but is not directly translatable. Specific case highlights will also be covered demonstrating the capability of the MTPS sensor across various industrial applications.

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