Moisture Risk in Unvented Attics Due to Air Leakage Paths

Prahl, Duncan; Shaffer, M. E.

doi:10.2172/1164104

Cited by 4 publications

(1 citation statement)

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“…Ces infiltrations ont été prises en compte dans les calculs. méthode la plus utilisée pour contrôler les températures élevées pendant l'été [6]. Afin d'éviter l'accumulation de l'humidité [6], un taux de ventilation minimal de 0,5 volumes par heure a été adopté dans les calculs.…”

Section: Introductionunclassified

Ventilation adaptée des combles en vue de l'amélioration de l'efficacité énergétique des constructions

et al. 2022

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Ce travail a pour but d'analyser l'influence de la présence d'un comble sur la consommation énergétique d'une construction. Des essais ont donc été menés sur une construction avec comble implantée à Bou Ismail au sein de l'Unité de Développement des Equipements Solaires (UDES). L’étude du comportement thermique de cette construction a été réalisée pendant les périodes hivernale et estivale. Des températures d'air de différentes zones thermiques de la construction ont été relevées et ont été comparées aux températures d'air calculées à partir d'un modèle numérique réalisé en utilisant le logiciel TRNSYS. Un modèle numérique calibré a pu ainsi être obtenu et a été utilisé pour réaliser différentes simulations numériques en faisant varier le taux de ventilation du comble. Les résultats des simulations ont permis de montrer que la diminution des besoins de climatisation est proportionnelle à l’augmentation du taux de ventilation du comble en été, et que la diminution des besoins de chauffage est proportionnelle à la diminution du taux de ventilation du comble en hiver.

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Section: Introductionunclassified

Ventilation adaptée des combles en vue de l'amélioration de l'efficacité énergétique des constructions

et al. 2022

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A Modeling Approach for Quantifying Exposures from Emissions of Spray Polyurethane Foam Insulation in Indoor Environments

Bevington

Guo

Hong

et al. 2017

Developing Consensus Standards for Measuring Chemical Emissions From Spray Polyurethane Foam (SPF) Insulation

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The Effect of Air leakage through the Air Cavities of Building Walls on Mold Growth Risks

Dang

Xia

et al. 2020

Energies

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Mold growth poses a high risk to a large number of existing buildings and their users. Air leakage through the air cavities of the building walls, herein gaps between walls and air conditioner pipes penetrating the walls, may increase the risks of interstitial condensation, mold growth and other moisture-related problems. In order to quantify the mold growth risks due to air leakage through air cavity, an office room in a historical masonry building in Nanjing, China, was selected, and its indoor environment has been studied. Fungi colonization can be seen on the surface of air conditioner pipes in the interior side near air cavity of the wall. Hygrothermometers and thermocouples logged interior and exterior temperature and relative humidity from June 2018 to January 2020. The measured data show that in summer the outdoor humidity remained much higher than that of the room, while the temperature near the air cavity stays lower than those of the other parts in the room. Hot and humid outdoor air may condense on the cold wall surface near an air cavity. A two-dimensional hygrothermal simulation was made. Air leakage through the air cavities of walls proved to be a crucial factor for mold growth.Energies 2020, 13, 1177 2 of 20 wall materials is the most important factor triggering the growth of microorganisms. The United States (US) Center for Disease Control stated in its guidance that "elimination of moisture intrusion and leaks and removal of mold" constitutes one of the three crucial interventions for houses implementation [16].Currently, advanced mold prediction models deal with the main influencing factors for mold growth: the surface temperature and relative humidity. Vereecken et al. [17] reviewed the models for mold growth and environmental risk prediction (isopleth systems [18,19], bio-hygrothermal model [20], ESP-r mold prediction model [21,22], VTT model [23]). Abe et al. [24] developed the fungal index to indicate the environmental capacity for mold growth. Hukka et al. [25] proposed a quantitative relationship between mold growth initiation conditions, maximum growth and growth rate. Sedlbauer [26] developed WUFI-Bio software (Klaus Sedlbauer, Department Hygrothermics at the Fraunhofer IBP, Munich, Germany) to assess mold risk by temperature, humidity and substrate in cases of transient conditions.Heat and moisture transfer simulation coupled with suitable temperature and humidity conditions for mold growth can also be used for evaluation [27].Building walls made of porous bricks or stones are easily exposed to outdoor moisture, including wind-driven rain [28] and rising dampness [29]. Additionally, improper energy conservation treatment [30][31][32], including inadequate insulation and unwanted air pathways, may cause thermal bridges and allow the surface temperature to become lower than the dew point of surrounding air, leading to unwanted condensation. Among them, air leakage through an air cavity [33] serves as one of the main moisture-transferring routes, redistributing the temperature and humidit...

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Moisture Risk in Unvented Attics Due to Air Leakage Paths

Cited by 4 publications

References 4 publications

Ventilation adaptée des combles en vue de l'amélioration de l'efficacité énergétique des constructions

Ventilation adaptée des combles en vue de l'amélioration de l'efficacité énergétique des constructions

A Modeling Approach for Quantifying Exposures from Emissions of Spray Polyurethane Foam Insulation in Indoor Environments

The Effect of Air leakage through the Air Cavities of Building Walls on Mold Growth Risks

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