Effect of moisture transfer across building components on room temperature

Gaur, Rahul; Bansal, N.K.

doi:10.1016/s0360-1323(00)00094-9

Cited by 26 publications

(7 citation statements)

References 9 publications

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“…Thus, the diffusion behavior in foams is important because the mass transfer of gases in the air control the cell gas composition for short to intermediate times, whereas the mass transfer of the blowing agent controls long-term composition changes in the foam. Condensed vapor is generally not taken into consideration in the optimizing insulation thickness; however, condensed vapor not only damages the building structures but also it has an energy that causes a loss in its transferring [9][10][11][12][13]. For this purpose, the relative humidity (RH) that affects the condensation process must be studied carefully.…”

Section: Introductionmentioning

confidence: 99%

Diffusivity and Climatic Simulation of Hybrid Foams

Desai

Basbagill

Nutt

et al. 2010

Journal of Cellular Plastics

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Hybrid composite phenolic foams reinforced with glass and aramid fibers were prepared and evaluated as potential materials for insulation and cladding applications. In particular, moisture uptake, flammability, and accelerated aging experiments were performed. A statistical approach was employed to model and predict the moisture absorption of the foams. Hybrid foams exhibited much lower diffusivity of water molecules and moisture content compared to unreinforced foam. The properties of hybrid foams were also compared to commercial expanded polystyrene (EPS) foam. The flammability properties of hybrid foams were markedly superior to EPS. Accelerated aging test revealed excellent dimensional stability of hybrid foams even under extreme conditions. Compressive stiffness of hybrid foams was retained even after aging.

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Section: Introductionmentioning

confidence: 99%

Diffusivity and Climatic Simulation of Hybrid Foams

Desai

Basbagill

Nutt

et al. 2010

Journal of Cellular Plastics

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“…However, the moisture buffering quality of the building materials which absorb and release the moisture modulates the indoor humidity. Using the analytical methods by Liu and Shun (1991), the authors Gaur and Bansal (2002) and Hall, Hoff and Nixon (1984) derived that the humidity present in ambient air and room air can modify up to 2-3 ℃ of room temperature with respect to the amount and direction of temperature and moisture gradients. According to Labat and Woloszyn (2015), the vapor transfer and its storage have a significant impact on heat transfer, indoor comfort, and durability of the wall assemblies.…”

Section: Lime As a Passive Strategy With Moisture Bufferingmentioning

confidence: 99%

Hygrothermal Performance of Old Lime Plastered Spaces in a Hot and Dry Climate

Paralkar

Damle

2020

FARU J.

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Lime plaster is one of the key sustainable building materials which is also effective as a passive cooling strategy. Since it is being used for ages now, it is the most compatible material for old heritage structures. Thus, majorly used in conservation projects. In this work, the hygrothermal performance of lime plaster is observed through simulations and surveys. Residential surveys are carried out for occupied old naturally ventilated spaces. The inner surface temperature, relative humidity, and moisture content of the walls are measured. Simultaneously, the indoor air temperature, relative humidity, globe temperature, and air velocity are measured. In hygroscopic materials like lime plaster, realistic conditions like mold growth cannot be predicted through simulations. A simulation of thermal and hygrometric behavior of historical buildings is a challenge. An inaccurate simulation may lead to inadequate conclusions, which could lead to inappropriate and dangerous actions for the building's heritage conservation. An attempt is made to use the survey readings and observations to predict the phenomenon of mold growth in a space while conducting simulations. Using a combined approach of simulation and survey, it was possible to predict the mold risk of the space.

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“…Equations (4) and (6) express the heat flux in terms of convection heat transfer and latent heat caused by phase change at the surfaces (x ¼ 0 and x ¼ l). The two terms on the left-hand side of the equal sign describe the supply of the heat flux under the influence of a temperature gradient and a relative humidity gradient.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The indoor temperature and humidity conditions including hygrothermal interactions with the building envelope were investigated. Gaur and Bansal 6 studied the effect of moisture transfer across building components on room temperature. They obtained analytic closed-form solutions for the heat and moisture distribution given by the Luikov system of partial differential equations.…”

Section: Introductionmentioning

confidence: 99%

The correction coefficients for the building air-conditioning load accounting for the whole building hygrothermal transfer process for major cities in China

Wang

Liu

Wang

et al. 2016

Indoor and Built Environment

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At present, the calculation software and design specifications related to building cooling and heating load are based mainly on heat transfer theory. The effect of building moisture transfer process on the air-conditioning load is rarely researched. The aim of this paper was to investigate the effect of the whole building hygrothermal transfer (WBHT) process on the indoor air temperature and relative humidity, wall inner surface temperature and moisture flux, sensible heat load, latent heat load and total air-conditioning load in different climates. A WBHT model was developed and validated by the analytic solution and experimental data. Three humidity regions in China were classified for summer and winter according to the different outdoor air relative humidity levels. The correction coefficients of air-conditioning load of major cities were obtained accounting for the WBHT process. Our results would provide a future reference for accurately calculating heating and cooling load of buildings in different climate regions.

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Effect of moisture transfer across building components on room temperature

Cited by 26 publications

References 9 publications

Diffusivity and Climatic Simulation of Hybrid Foams

Diffusivity and Climatic Simulation of Hybrid Foams

Hygrothermal Performance of Old Lime Plastered Spaces in a Hot and Dry Climate

The correction coefficients for the building air-conditioning load accounting for the whole building hygrothermal transfer process for major cities in China

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