ISO-11092-1993.pdf
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1、INTERNATIONAL STANDARD ISO 11092 First edition 1993-1 o-1 5 Textiles - Physiological effects - Measurement of thermal and water-vapour resistance under steady-state conditions (sweating guarded-hotplate test) Textiles - Effets physiologiques - Mesurage de Ia rbktance thermique et de ia r Order No. C
2、RM 064 A (dimensions 1,092 + 0,015 m*K/W). 300 mm x 300 mm, thickness 33,5 mm, density 90.9 kg/m, thermal resistance Ret = 6 ISO 11092:1993(E) The test specimens shall be placed so that they lie flat across the measuring unit, with the side normally facing the human body towards the measuring unit.
3、In the case of multiple layers, specimens shall be ar- ranged and stacked on the measuring unit as on the human body. Water-vapour impermeable adhesive tape or a light metal frame may be used around the edges of the test specimen to keep it flat. Bubbles and wrinkles in the test specimen, or air gap
4、s between the specimen and measuring unit or be- tween the components of multilayer specimens, shall be prevented provided they are not specific to the surface Profile of the specimens. 7.2.2 Normally, test specimens are measured free from stretch or loading and, in the case of multiple layers, with
5、out air gaps between layers. However, if a test is carried out under extension or applied press- ure or with air gaps, this shall be mentioned in the test report. 7.2.3 With test specimens thicker than 3 mm, the measuring unit shall be Iowered so that the outer surface of the specimen is flush with
6、the measuring ta ble. 7.3 Measurement of thermal resistance R, 7.3.1 Set the temperature of the measuring unit Tm at 35 “C and the air temperature Ta at 20 “C with a relative humidity R.H. of 65 %. Set the air Speed va at 1 m/s. Any deviations from these values shall be within the limits stated in c
7、lause 5. Other conditions of air temperature Ta, relative hu- midity R.H. and air Speed V, may be used. The test report shall describe the alternative conditions and shall include a Statement to the effect that the results differ from those of tests carried out under the con- ditions stated in this
8、International Standard. After placing the test specimen on the measuring unit, wait until the measured quantities (Tm, Ta, R.H., H) resch steady-state before recording their values. 7.3.2 Calculate the thermal resistance R, from equation (5): Ret = (Tm - TJmA _ R H-AH, cto . . . (5) where the Symbol
9、s and units are defined in clause 3. Calculate the thermal resistance Ret of the material being tested as the arithmetic mean of the individual measurements. 7.4 Measurement of water-vapour resistance Ret 7.4.1 For the measurement of water-vapour resist- ante, a water-vapour permeable but liquid-wat
10、er impermeable cellophane membrane shall be fitted over the surface of the measuring unit as described in 7.1.2. 7.4.2 Set the temperature of both the measuring unit Tm and the air Ta to 35 “C with a relative humidity R.H. of 40 %. Hold the air Speed V, at 1 m/s. Any de- viations from these values s
11、hall be within the Iimits stated in clause 5. These isothe rmal condition S conde nsation within the test S prevent pecimen. water-vapour Other conditions of relative humidity and air Speed va may be used. The test report shall describe the alternative conditions and shall include a Statement to the
12、 effect that the results may differ from those of tests carried out under the conditions stated in this International Standard. If the air temperature Ta is changed, the test is non- isothermal and this International Standard no longer applies. After placing the test specimen on the measuring unit,
13、wait until the measured quantities (Tm, Ta, R.H., H) have reached steady-state before recording their values. 7.4.3 Calculate the water-vapour resistance R, from equation (8): Ret = (Pr-n-PaM -R H-AH, et0 . . . (6) where the Symbols and units are defined in clause 3. Calculate the water-vapour resis
14、tance R, of the ma- terial being tested as the arithmetic mean of the indi- vidual measurements. 8 Precision of results 8.1 Repeatability For thermal resistance R, the precision of repeated measurements on the same specimens with values up to 50 x 1o-3 m2gK/W has been found to be 3,0 x 10D3 m2mK/W,
15、as measured on Single layers of fabrics. With R, values higher than 50 x 10w3 m*eK/W, the precision has been found to be 7 %, as measured on foams. For water-vapour resistance R, the precision of re- peated measurements on the Same specimens with values up to 10 m2mPa/W has been found to be O,3 m2mP
16、a/W, as measured on Single layers of fabrics. -,-,- ISO 11092:1993(E) With Ret values higher than 10 m*mPa/W, the precision has been found to be 7 %, as measured on foams. 8.2 Reproducibility In an interlaboratoty trial using three specimens of a foam material of 3 mm, 6 mm and 12 mm thickness teste
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