scholarly journals Parametric study on the hygrothermal performance of timber frame walls with external airtightness membranes in a temperate maritime climate

2019 ◽  
Vol 282 ◽  
pp. 02080
Author(s):  
Valentina Marincioni ◽  
Federico Lorenzetti ◽  
Hector Altamirano-Medina
Keyword(s):  
Parametric Study ◽  
Indoor Environment ◽  
Moisture Transfer ◽  
Wall Structure ◽  
Two Dimensional ◽  
Mould Growth ◽  
Timber Frame ◽  
Maritime Climate ◽  
Hygrothermal Performance ◽  
Control Layer

In recent years, external airtightness membranes have become an option for timber frame wall systems, as they allow high levels of air- and wind-tightness with an easy installation and provide rainwater protection during construction. This opens up the option of removing the internal air and vapour control layer. However, the hygrothermal risks associated to this option could be higher than in conventional construction, because vapour transfer can occur from the indoor environment into the timber frame wall not just via diffusion but also advection. This can lead to moisture accumulation and mould growth risk within the wall structure. This paper presents a parametric study that aims at identifying the moisture risk when external airtightness membranes are installed on a timber frame wall in a temperate maritime climate. The parametric study considered the two-dimensional heat, air and moisture transfer within a timber frame wall. Parameters having higher influence on moisture risk were identified and should be considered when designing robust wall systems.

scholarly journals PARAMETRIC STUDY OF THE ROSSBY WAVE INSTABILITY IN A TWO-DIMENSIONAL BAROTROPIC DISK

2016 ◽  
Vol 823 (2) ◽  
pp. 84 ◽  
Author(s):  
Tomohiro Ono ◽  
Takayuki Muto ◽  
Taku Takeuchi ◽  
Hideko Nomura
Keyword(s):  
Rossby Wave ◽  
Parametric Study ◽  
Two Dimensional ◽  
Wave Instability

scholarly journals About Two-dimensional Mathematical Model of Contaminant Migration in Unsaturated Catalytic Porous Media with Traps

2020 ◽  
pp. 25-28
Author(s):  
Anatolyy Vlasyuk ◽  
Viktor Zhukovskyy ◽  
Nataliia Zhukovska ◽  
Serhiy Kraychuk
Keyword(s):  
Mathematical Model ◽  
Porous Media ◽  
Moisture Transfer ◽  
Physical Problem ◽  
Two Dimensional ◽  
Contaminant Migration ◽  
Nonlinear Case ◽  
The Finite Difference Method ◽  
Saline Solutions ◽  
Assessment Strategies

This paper proposes an approach for the computer simulation of complex physical problem of contaminant migration through unsaturated catalytic porous media to the filter-trap. The corresponding mathematical model in the two-dimensional nonlinear case is presented. The model includes detailed considerations of the moisture transfer of saline solutions under the generalized Darcy’s and Cluta’s laws in different subregions of soil. The numerical solution of the boundary value problem was found by the finite difference method and proposed the algorithm for computer implementation. The proposed algorithm may be used for creating software with effective risk assessment strategies and predicting the cleaning and further useful use of the soil massifs.

scholarly journals An Experimental Study on the Drying-Out Ability of Highly Insulated Wall Structures with Built-In Moisture and Rain Leakage

2019 ◽  
Vol 9 (6) ◽  
pp. 1222 ◽  
Author(s):  
Klaus Viljanen ◽  
Xiaoshu Lu
Keyword(s):  
Energy Efficient ◽  
Moisture Transfer ◽  
Mineral Wool ◽  
Rain Event ◽  
Controversial Issues ◽  
Wall Structures ◽  
Hygrothermal Performance ◽  
The Difference ◽  
Wood Frame ◽  
Heat And Moisture

The recent research on highly insulated structures presents controversial conclusions on risks in moisture safety. This paper addresses these controversial issues through investigating the hygrothermal performance of energy efficient envelope structures under high moisture loads. The experiments consist of built-in moisture and rain leakage tests in mineral wool insulated structures. A heat and moisture transfer simulation model is developed to examine the drying-out ability in both warm and cold seasons. The results show that the energy efficient structures have an excellent drying out ability against built-in and leakage moisture. The difference in the drying ability is limited compared to conventional structures. A critical leakage moisture amount reaching the insulation cavity for a wood frame wall is determined to be between 6.9–20.7 g in a single rain event occurring every other day. Further research is required to target highly insulated structures, particularly addressing water vapor diffusion and convection.

On the Response of Elastic-Plastic Tubes Under Combined Bending and Tension

1992 ◽  
Vol 114 (1) ◽  
pp. 50-62 ◽  
Author(s):  
J. Y. Dyau ◽  
S. Kyriakides
Keyword(s):  
Numerical Simulation ◽  
Parametric Study ◽  
Axial Load ◽  
Test Specimen ◽  
Experimental Results ◽  
Two Dimensional ◽  
Plastic Range ◽  
Rigid Surface ◽  
Axial Tension ◽  
Thin Walled

This paper is concerned with the response of long, relatively thin-walled tubes bent into the plastic range in the presence of axial tension. The work is motivated by the design needs of pipelines installed and operated in deep offshore waters. The problem is studied through a combination of experiment and analysis. In the experiments, long metal tubes were bent over a smooth, circular, rigid surface (mandrel). Bending of the tubes was achieved by shear and axial end loads. The experimental arrangement is such that a significant section of the test specimen is loaded and deformed in an axially uniform fashion. The ovalization induced in the specimen was measured as a function of the axial load in the tube for two mandrel radii. A two-dimensional numerical simulation of the problem has been developed and validated against the experimental results. This analysis was used to conduct a parametric study of the effect of tension on the ovalization induced in a long tube during bending.

A cyano-bridged molecular magnet with a novel two-dimensional brick wall structure

2000 ◽  
pp. 1309-1310 ◽  
Author(s):  
Hui-Zhong Kou ◽  
Song Gao ◽  
Bao-Qing Ma ◽  
Dai-Zheng Liao
Keyword(s):  
Wall Structure ◽  
Molecular Magnet ◽  
Brick Wall ◽  
Two Dimensional
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