A Sweating and Moving Arm for the Measurement of Thermal Insulation and Water Vapour Resistance of Clothing

2009 ◽  
pp. 257-257-12 ◽  
Author(s):  
MS Weder ◽  
T Zimmerli ◽  
RM Rossi
Keyword(s):  
Water Vapour ◽  
Thermal Insulation ◽  
Water Vapour Resistance

scholarly journals Evaluation of Bed Cover Properties Produced from Double Fabric Based on Honeycomb

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
A. A. Salama ◽  
A. S. El-Deeb ◽  
I. M. El-shahat
Keyword(s):  
Thermal Comfort ◽  
Water Vapour ◽  
Thermal Insulation ◽  
Abrasion Resistance ◽  
Air Permeability ◽  
Weft Yarn ◽  
Vapour Permeability ◽  
Geometrical Properties ◽  
Fabric Structure ◽  
Air Pockets

This research aims to innovate a new fabric structure, which could be used as a bed cover based on double honeycomb fabric with self-stitching. The honeycomb air pockets were aimed at facing each other to form closed small air chambers which work to sequester the air. The double fabric increases fabric thickness. Thus, the opportunity to improve thermal comfort could be achieved. A number of samples were produced with different densities and counts of weft yarn. Thermal insulation and water vapour permeability were measured and compared with bed covers produced from reversible weft backed structure. Geometrical properties, abrasion resistance, and air permeability were also measured. The results showed that the innovated structure had higher values of thermal insulation than reversible weft backed structure at certain weft counts and densities.

scholarly journals Combined bound water and water vapour diffusion of Norway spruce and European beech in and between the principal anatomical directions

Holzforschung ◽  
2011 ◽  
Vol 65 (6) ◽  
pp. 819-828 ◽  
Author(s):  
Walter Sonderegger ◽  
Manuele Vecellio ◽  
Pascal Zwicker ◽  
Peter Niemz
Keyword(s):  
Diffusion Coefficient ◽  
Steady State ◽  
Water Vapour ◽  
Diffusion Coefficients ◽  
Bound Water ◽  
European Beech ◽  
Unsteady State ◽  
Water Vapour Diffusion ◽  
Vapour Diffusion ◽  
Water Vapour Resistance

Abstract The combined bound water and water vapour diffusion of wood is of great interest in the field of building physics. Due to swelling stresses, the steady-state-determined diffusion coefficient clearly differs from the unsteady-state-determined diffusion coefficient. In this study, both diffusion coefficients and the water vapour resistance factor of Norway spruce (Picea abies [L.] Karst.) and European beech (Fagus sylvatica L.) were investigated for the principal anatomical directions (radial, tangential and longitudinal) and in 15° steps between these directions. The values were determined with the cup method as the basic principle. The unsteady-state-determined diffusion coefficient is, independent of the direction, about half that of the steady-state-determined diffusion coefficient. Both diffusion coefficients are about two to three times higher for spruce than for beech. They are up to 12 times higher in the longitudinal direction than perpendicular to the grain for spruce, and up to 15 times higher for beech. With increasing moisture content, the diffusion coefficients exponentially increase. The water vapour resistance factor shows converse values to the diffusion coefficients.

Mathematical models for water vapour resistance prediction of printed garments

2017 ◽  
Vol 134 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Mladen Stančić ◽  
Nemanja Kašiković ◽  
Dragana Grujić ◽  
Dragoljub Novaković ◽  
Rastko Milošević ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Water Vapour ◽  
Resistance Prediction ◽  
Water Vapour Resistance

Properties of a Sandwich Thermal Insulation Composite with Silica Aerogel

2016 ◽  
Vol 707 ◽  
pp. 114-121
Author(s):  
Jan Fořt ◽  
Milena Pavlíková ◽  
Jaroslav Pokorný ◽  
Anton Trník ◽  
Zbyšek Pavlík
Keyword(s):  
Water Vapour ◽  
Thermal Insulation ◽  
Silica Aerogel ◽  
Free Water ◽  
Moisture Diffusivity ◽  
Sandwich Composite ◽  
Water Absorption Coefficient ◽  
Insulation Systems ◽  
New Type ◽  
Temperature Exposure

Properties of a new type of sandwich composite based on magnesium board, silica aerogel thermal insulation layer, and water vapour barrier are experimentally analysed in the paper. For the basic characterization of the studied material, bulk density, matrix density, and total open porosity are measured. Among the thermal properties, thermal conductivity, thermal diffusivity, and volumetric heat capacity are accessed. Water vapour transmission properties are determined using the dry-cup and wet-cup arrangements of the cup method. In order to describe the liquid moisture transport, water absorption coefficient and apparent moisture diffusivity are calculated based on the data obtained from the free water intake experiment based on the sorptivity concept. Ability of the tested material to accumulate water vapour is described by the sorption and desorption isotherms measured using a dynamic vapour sorption device. Mechanical resistivity of the tested composite is characterized by its compressive and flexural strength. Additionally, in order to get information on material performance at high temperature exposure, simultaneous TG and DSC analysis is done. The obtained data gives clear evidence on sandwich performance and proved its applicability in interior thermal insulation systems.

scholarly journals The change of water vapour resistance of materials used for the clothing production during exploitation

2016 ◽  
Vol 5 (2) ◽  
pp. 73-78 ◽  
Author(s):  
Mirjana Reljic ◽  
Jovan Stepanovic ◽  
Branislava Lazic ◽  
Nenad Cirkovic ◽  
Dragana Cerovic
Keyword(s):  
Water Vapour ◽  
Water Vapour Resistance ◽  
Materials Used

scholarly journals Correlation of Air Permeability to Other Breathability Parameters of Textiles

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 140
Author(s):  
Karel Adámek ◽  
Antonin Havelka ◽  
Zdenek Kůs ◽  
Adnan Mazari
Keyword(s):  
Water Vapour ◽  
Air Permeability ◽  
Water Vapour Permeability ◽  
Textile Material ◽  
Permeability Measurement ◽  
Smart Textiles ◽  
Vapour Permeability ◽  
Clothing Comfort ◽  
Strong Relation ◽  
Water Vapour Resistance

In the field of textile comfort of smart textiles, the breathability of the material is very important. That includes the flow of air, water and water vapours through the textile material. All these experiments are time consuming and costly; only air permeability is much faster and economical. The research is performed to find correlation between these phenomena of breathability and to predict the permeability based on only the air permeability measurement. Furthermore, it introduces a new way of expressing the Ret (water vapour resistance) unit according to SI standards as it is connected with the air permeability of garments. The need to find a correlation between air permeability and water vapour permeability is emphasised in order to facilitate the assessment of clothing comfort. The results show that there is a strong relation between air permeability and water vapour permeability for most of the textile material.

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