scholarly journals Numerical Evaluation Of Hygrothermal Performance And Mould Growth Risk Of Multi-Layer Wall In The Hot And Humid Southern China Area

2020 ◽  
Author(s):  
Aimin Fang ◽  
Youming Chen
Keyword(s):  
Numerical Evaluation ◽  
Southern China ◽  
Mould Growth ◽  
Hygrothermal Performance

scholarly journals Hygrothermal performance of the building envelope with low environmental impact: case of a hemp concrete envelope

2021 ◽  
Vol 2069 (1) ◽  
pp. 012006
Author(s):  
A Kabore ◽  
W Maref ◽  
C O Plamondon
Keyword(s):  
Environmental Impact ◽  
Air Conditioning ◽  
Energy Performance ◽  
Building Envelope ◽  
Glass Wool ◽  
Mould Growth ◽  
Cement Block ◽  
Hygrothermal Performance ◽  
The City

Abstract This document is a case study of hemp-based materials integrated into the building envelope for African and North American’s applications. The objective is to evaluate the energy performance of hemp concrete for construction in Montreal, Canada, where heating predominates and in Dori, Burkina Faso, where air conditioning predominates. The effect of thermal and hygrothermal comfort of hemp concrete, glass wool, cement block and compressed earth brick walls were simulated to quantify the benefits on overheating during the hottest months for the city of Dori and the risk of mould growth in the walls of the building in winter for the city of Montreal.

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 Analysis of hygrothermal performance of low-energy house in Nordic climate

2021 ◽  
pp. 174425912098418
Author(s):  
Filip Fedorik ◽  
Sanna Alitalo ◽  
Jukka-Pekka Savolainen ◽  
Ilkka Räinä ◽  
Kimmo Illikainen
Keyword(s):  
Building Design ◽  
Time Measurement ◽  
Measured Data ◽  
Low Energy ◽  
Structural Elements ◽  
Mould Growth ◽  
Real Time Measurement ◽  
Hygrothermal Performance ◽  
Design Values ◽  
Favourable Environment

Analyses of hygrothermal conditions in low-energy houses is important because of their likely sensitivity for excessive moisture. The presented work deals with real-time measurement of temperature and relative humidity at multiple locations inside a low-energy house envelope. The measured data allows diagnosing approaches towards building design and understanding and evaluating the house performance. Suitability and accuracy of numerical computation was analysed. The Finnish mould growth model was used to monitor risk and extent of mould growth under measured and computed conditions. The measured conditions represent more favourable environment to avoid mould growth than the design values recommended by national and international guidelines. There was no mould growth indicated at any monitored points of the envelope. Monitoring the hygrothermal conditions provides valuable information about the performance of structural elements, building material and the house envelope and it helps to predict moisture related risks during the building’s service life.

scholarly journals The impacts of COVID-19 pandemic on the hygrothermal environment of our homes

2021 ◽  
Vol 2069 (1) ◽  
pp. 012248
Author(s):  
Arianna Brambilla ◽  
Alberto Sangiorgio
Keyword(s):  
Residential Buildings ◽  
Mould Growth ◽  
Indoor Temperature ◽  
Residential Sector ◽  
Work From Home ◽  
Hygrothermal Performance ◽  
Transient Simulations ◽  
Current Design ◽  
Hygrothermal Environment ◽  
Humidity Profiles

Abstract In 2020 the residential sector witnessed a complete transformation of the way people live and occupy the spaces. Indeed, different Countries introduced total lockdowns as a measure to contain and prevent the spread of COVID-19, forcing people to stay at home. These measures impact the indoor hygrothermal environment: higher internal thermal loads and moisture generation rate may create the perfect situation to support mould growth. This project aims to understand the impacts of increased work-from-home practices on the hygrothermal performance of residential buildings. The assessment uses a two-step methodology: firstly, whole building transient simulations (software trnsys) are used to generate the indoor temperature and humidity profiles, secondly hygrothermal transient simulations (software WUFI) are used to quantify the risk of mould growth. This research reveals the inadequacy of current design and construction practices to support flexible occupation patterns.

A building corner model for hygrothermal performance and mould growth risk analyses

2009 ◽  
Vol 52 (21-22) ◽  
pp. 4862-4872 ◽  
Author(s):  
Gerson Henrique dos Santos ◽  
Nathan Mendes ◽  
Paulo Cesar Philippi
Keyword(s):  
Mould Growth ◽  
Hygrothermal Performance

scholarly journals Experimental and numerical evaluation of the hygrothermal performance of a hemp lime concrete building: A long term case study

2018 ◽  
Vol 136 ◽  
pp. 11-27 ◽  
Author(s):  
Bassam Moujalled ◽  
Yacine Aït Ouméziane ◽  
Sophie Moissette ◽  
Marjorie Bart ◽  
Christophe Lanos ◽  
...  
Keyword(s):  
Numerical Evaluation ◽  
Hygrothermal Performance ◽  
Concrete Building

scholarly journals HYGROTHERMAL PERFORMANCE OF BUILDING ENVELOPES IN THE TROPICS UNDER OPERATIVE CONDITIONS: CONDENSATION AND MOULD GROWTH RISK APPRAISAL

2016 ◽  
Vol 78 (5) ◽  
Author(s):  
Maisarah Ali ◽  
Majeed Olaide Oladokun ◽  
Samsul Bahrin Osman ◽  
Shamzani Affendy Mohd Din ◽  
Mohd Sharifuddin Ibrahim ◽  
...  
Keyword(s):  
Performance Assessments ◽  
Mould Growth ◽  
Cooling Mode ◽  
Humid Climate ◽  
Building Envelopes ◽  
Operational Profile ◽  
In Situ Experiments ◽  
Hygrothermal Performance ◽  
The Tropics

Poor indoor hygrothermal performance increases the risk of indoor moisture problems and deterioration due to mould growth, corrosion and damage to archival materials. Hence, proper control of indoor thermohygric intensity abates indoor moisture and its associated problems. This paper presents the results of envelopes hygrothermal performance assessments in a hot and humid climate building with varying operational profile between adjacent spaces. The case-studied building runs on 24hrs cooling mode in one part against natural and/or mechanical supply-exhaust fan means on the other. In-situ experiments were combined with hygrothermal analytical methods to assess the envelope thermal quality together with the operative conditions against condensation and mould growth risks. The results show that the building is overcooled leading to poor envelope hygrothermal performance with associated condensation and mould growth problems on non-air-conditioned sides of the envelopes. 

scholarly journals Hygrothermal assessment of north-facing, cold attic spaces under the eaves with varying structural roof scenarios

2019 ◽  
Vol 44 (1) ◽  
pp. 3-36
Author(s):  
Nickolaj Feldt Jensen ◽  
Søren Peter Bjarløv ◽  
Christopher Just Johnston ◽  
Casper Fabian Hillestrøm Pold ◽  
Morten Hjorslev Hansen ◽  
...  
Keyword(s):  
Best Practice ◽  
Temperate Climate ◽  
Experimental Setup ◽  
Mould Growth ◽  
Ventilation Strategy ◽  
Practice Recommendations ◽  
Cool Temperate ◽  
Hygrothermal Performance ◽  
Ventilation Strategies ◽  
Indoor And Outdoor

The objective of this study was to test whether compliance with the current Danish best practice recommendations concerning design of the cold attic space will prevent damaging moisture levels. The project was performed as a full-scale experimental setup in the cool temperate climate of Denmark. The setup comprised 18 north-facing attic spaces with varying ventilation principles and varying infiltration scenarios. The relative humidity and temperature were measured in attic spaces, indoor and outdoor, for almost 3 years. The hygrothermal performance of the attics was evaluated by post-processing and comparing the data with predicted mould growth risk and with visual observations of mould growth. The results showed that following the recommended passive ventilation strategies made the hygrothermal performance in attics with diffusion-open roofing underlay worse. In addition, increasing vapour diffusion tightness of the roofing underlay made the hygrothermal performance of the cold attic spaces under the eaves worse, except for attics with passive ventilation but without infiltration. The hygrothermal performance of the attics with diffusion-tight roofing underlay was poor when combining infiltration and the assessed ventilation strategy. The performance of the same attic without infiltration showed that some degree of ventilation was needed. External roof insulation did not significantly improve the hygrothermal performance of the attic.

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