ISO 11092:2014 pdf download.Textiles — Physiological effects —Measurement of thermal and water-vapour resistance under steady-state conditions (sweating guarded-
hotplate test).
4 Principle
The specimen to be tested is placed on an electrically heated plate with conditioned air ducted to flow across and parallel to its upper surface as specified in this International Standard.
For the determination of thermal resistance, the heat flux through the test specimen is measured after steady-state conditions have been reached.
The technique described in this International Standard enables the thermal resistance of a material to be determined by subtracting the thermal resistance of the boundary air layer above the surface of the test apparatus from that of a test specimen plus boundary air layer, both measured under the same conditions.
For the determination of water-vapour resistance, an electrically heated porous plate is covered by a water-vapour permeable but liquid-water impermeable membrane. Water fed to the heated plate evaporates and passes through the membrane as vapour, so that no liquid water contacts the test specimen. With the test specimen placed on the membrane, the heat flux required to maintain a constant temperature at the plate isa measure of the rate of water evaporation, and from this the water-vapour resistance of the test specimen is determined.
The technique described in this International Standard enables the water-vapour resistance Ret of a material to be determined by subtracting the water-vapour resistance of the boundary air layer above the surface of the test apparatus from that of a test specimen plus boundary air layer, both measured under the same conditions.
The specimen to be tested is placed on an electrically heated plate with conditioned air ducted to flow across and parallel to its upper surface as specified in this International Standard.
For the determination of thermal resistance, the heat flux through the test specimen is measured after steady-state conditions have been reached.
The technique described in this International Standard enables the thermal resistance of a material to be determined by subtracting the thermal resistance of the boundary air layer above the surface of the test apparatus from that of a test specimen plus boundary air layer, both measured under the same conditions.
For the determination of water-vapour resistance, an electrically heated porous plate is covered by a water-vapour permeable but liquid-water impermeable membrane. Water fed to the heated plate evaporates and passes through the membrane as vapour, so that no liquid water contacts the test specimen. With the test specimen placed on the membrane, the heat flux required to maintain a constant temperature at the plate isa measure of the rate of water evaporation, and from this the water-vapour resistance of the test specimen is determined.
The technique described in this International Standard enables the water-vapour resistance Ret of a material to be determined by subtracting the water-vapour resistance of the boundary air layer above the surface of the test apparatus from that of a test specimen plus boundary air layer, both measured under the same conditions.
