Abstract
The conventional methods of estimating the thermal comfort properties of
clothing materials (thermal resistance and water vapour permeability) are not
suitable for cold weather clothing materials, where a substantial
condensation of water vapour takes place in the textiles.A new apparatus, the
sweating cylinder, was constructed, which measures simultaneously the heat and
moisture transfer in textile systems.A test series was performed, in which 24
material combinations for winter work wear were tested in 3 environment
temperatures (0, -20, and -40 °C) and at 2 sweating levels (72 and 145
ml/m²h).The thermal resistance and moisture evaporation values were determined
and compared with values from standard measurements.The results show that the
thermal resistance of the clothing decreases with an increasing sweating
level.The water vapour is only partly transmitted through the textile layers
and partly condensates within them.Particularly at -40 °C most of the water
remains in the textiles.The correlation of the results from the sweating
cylinder with standard thermal resistance measurements is fair at low but poor
at high sweating levels.The correlation between standard water vapour
transmission tests and evaporation on the cylinder is poor.The test series
proved that the sweating cylinder is a valuable instrument for measuring the
heat and moisture transmission through textile materials in different
environments.After some technical refinements it will be introduced as a
standard test method to other research laboratories.
Original language | English |
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Qualification | Doctor Degree |
Awarding Institution |
|
Award date | 7 Oct 1985 |
Place of Publication | Espoo |
Publisher | |
Print ISBNs | 951-38-2393-8 |
Publication status | Published - 1985 |
MoE publication type | G4 Doctoral dissertation (monograph) |
Keywords
- clothing
- physiology
- heat transmissions
- moisture
- tests