ISO 11092:2014 pdf free

ISO 11092:2014 pdf free.Textiles一Physiological effects
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 Ret 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 is a 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.
Measuring unit, with temperature and water supply control, consisting of a metal plate approximately 3 mm thick with a minimum area of 0,04 m2 (e.g. a square with each side 200 mm in length, D) fixed to a conductive metal block containing an electrical heating element [see Figure 1,items (1) and (6)]. For the measurement of water-vapour resistance, the metal plate (1) must be porous.
It is surrounded by a thermal guard [item (8) of Figure 2] which is in turn located within an opening in a measuring table (11).
The coefficient of radiant emissivity of the plate surface (1) shall be greater than 0,35, measured at 20 °C between the wavelengths 8 um to 14 um, with the primary beam perpendicular to the plate surface and the reflection hemispherical.
Channels are machined into the face of the heating element block (6) where it contacts the porous plate to enable water to be fed from a dosing device (5).ISO 11092 pdf download.