Ergonomics of the thermal environment. Estimation of thermal insulation and water vapour resistance of a clothing ensemble

2007 ◽  
Keyword(s):  
Water Vapour ◽  
Thermal Insulation ◽  
Thermal Environment ◽  
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.

Study on the Thermal Performance of the Vernacular Dwellings in Wei-He Plain of Shaanxi Province

2012 ◽  
Vol 476-478 ◽  
pp. 1589-1595
Author(s):  
Yi Ping Zhu ◽  
Xi Liao ◽  
Shu Yun Wu ◽  
Jing Luo ◽  
Yuan Jiang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Thermal Environment ◽  
Local Area ◽  
Shaanxi Province ◽  
Indoor Thermal Environment ◽  
Questionnaire Surveys

Based on indoor thermal environment test and questionnaire surveys, the paper studies on thermal insulation capacity and indoor thermal environment of the vernacular dwellings in Wei-he Plain of Shaanxi Province, China, and analyses their heating methods and application status. Besides, the popularity of sustainable techniques in local area has been evaluated and summarized. Moreover, the paper discusses the present problems in local indoor thermal environment and energy-saving status.

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

scholarly journals Effects of Roof Insulation on the Thermal Conditions of a Medium Scaled Tropical Enclosed Giant Freshwater Prawn (Macrobrachium rosenbergii) Hatchery

2012 ◽  
Vol 610-613 ◽  
pp. 1091-1098
Author(s):  
Ahmad Kamil Kamarudin ◽  
Mohd Salleh Kamarudin ◽  
Sabarinah Sh Ahmad ◽  
Elias Salleh
Keyword(s):  
Thermal Insulation ◽  
Thermal Environment ◽  
Larval Growth ◽  
Macrobrachium Rosenbergii ◽  
Thermal Conditions ◽  
Freshwater Prawn ◽  
Giant Freshwater Prawn ◽  
Indoor Thermal Environment ◽  
Insulation Materials ◽  
Human Thermal Comfort

This study was conducted to evaluate the effects of roof thermal insulation on the indoor thermal environment of an existing enclosed giant freshwater prawn hatchery in relation to human thermal comfort and the thermal requirement for optimal larval growth. A typical medium scaled enclosed hatchery in Ipoh, Malaysia was chosen for this study. Thermal performances of five thermal insulation materials installed on the roof of the building were studied using Integrated Environmental Solutions (IES) Virtual Environment software. Results showed no significant differences for indoor air temperatures reduction among the insulation materials. However, the installation of roof insulation gave a cooler indoor thermal environment and provided a suitable water temperature/ improved water thermal condition for the prawn larviculture. The study also suggested the aluminium foil was the best insulation for the partially transparent roof of the building.

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.

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