Study of moisture in buildings for hot humid climates

Lucas, Franck; Adelard, Laëtitia; Garde, François; Boyer, Harry

doi:10.1016/s0378-7788(01)00115-3

Cited by 47 publications

(19 citation statements)

References 3 publications

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“…The moisture diffusion within interior building wall materials is a second-order partial differential equation as descripted in equation (3). The moisture flux at arbitrary displacement x of building wall materials and time t is given by equation (4). As the water vapor partial pressure is hard to be measured, the water vapor concentration is used.…”

Section: Tmpd Modelmentioning

confidence: 99%

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Application analysis of theoretical moisture penetration depths of conventional building material

Wan

2017

Advances in Mechanical Engineering

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Due to the significant impact of indoor humidity on indoor air quality, human comfort, and energy consumption, many researchers have investigated the use of various hygroscopic materials to moderate indoor humidity levels and save energy. The results show that the indoor relative humidity of the room with hygroscopic materials is more stable and moderate. Hygroscopic materials can be also used to reduce the energy consumption of heating, ventilation, and air-conditioning system. Although many laboratory measurements and numerical simulation studies have been done for hygroscopic materials, there is little study on moisture penetration in materials with limited thickness in practical engineering application. Moisture penetration depth has great influence on material moisture parameters and indoor humidity simulation model, such as effective moisture penetration depth model. In this article, a theoretical moisture penetration depth model is developed, and the theoretical moisture penetration depths of conventional building materials are calculated. The results show that when the wall material thickness is below the 1/e theoretical moisture penetration depth, the proportional relationship between the moisture buffer value and the square root of time is not kept. When the wall material thickness is thinner than its theoretical moisture penetration depth, ignoring the material thickness might cause significant error in indoor moisture content calculation using effective moisture penetration depth model.

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Section: Tmpd Modelmentioning

confidence: 99%

“…[1][2][3][4] Excessively low or high relative humidity (RH) is easy to cause the uncomfort of the skin, 5,6 mold growth, 7 and respiratory disease which are not good for living and working. Besides the influence on air quality, moisture can also impact the building energy in several situations.…”

Section: Introductionmentioning

confidence: 99%

Application analysis of theoretical moisture penetration depths of conventional building material

Wan

2017

Advances in Mechanical Engineering

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“…Developed by the Physics and Mathematical Engineering Laboratory for Energy and Environment at the University of Reunion Island, CODYRUN [5][6][7][8][9][10][11][12][13] is a multi-zone software program integrating ventilation and moisture transport transfer in buildings. The software employs a zone approach based on nodal analysis and resolves a coupled system describing thermal and airflow phenomena.…”

Section: From Thermal Simulation To Daylight Modelmentioning

confidence: 99%

“…Details of the CODYRUN data structures are given in Lucas et al [13] although details on the internal organization are not so common, with the exception of ENERGY+ [1], ESP-r [2], and COMFIE [15].…”

Section: From Thermal Simulation To Daylight Modelmentioning

confidence: 99%

Evolution of CODYRUN from Thermal Simulation to Coupled Thermal and Daylight Simulation Software

Boyer¹,

Fakra²,

Miranville³

et al. 2014

Energy Procedia

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CODYRUN is a multi-zone software integrating thermal building simulation, airflow, and pollutant transfer. Described in numerous publications, this software was originally used for the passive design of buildings, both for research and teaching purposes. In this context, the data treated were mainly concerned with volumes (zones), surfaces and thicknesses (walls and windows), materials, and systems, with the aim to determine temperatures, heat fluxes, energy consumed, air transfers, and so on.The question thus arose as to the integration of indoor lighting conditions into the simulation. Hence, previous data structures had to be amended to incorporate the spatial positioning of entities (walls, windows, and artificial lighting sources) through vertexes. A set of procedures was also developed for polygons as well as calculating natural and artificial lighting.The results of this new daylighting module were then compared with other results of simulation codes and experimental cases both in artificial and natural environments. Excellent agreements were obtained, such as the values for luminous efficiencies in a tropical and humid climate.A simulation exercise was conducted in a classroom located in Reunion Island (French overseas territory in the Indian Ocean), thus confirming the interest for thermal and daylighting designs in lowenergy buildings.

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“…The optimum relative humidity levels are between 40 % and 60 %, with levels outside of this optimum range associated with discomfort, health risks and degradation of some building materials [2][3][4]. The World Health Organization estimates that, globally over four million deaths were caused by household air pollution in 2012 [5].…”

Section: Introductionmentioning

confidence: 99%

Improvement of indoor air quality by MDF panels containing walnut shells

Silva

Stefanowski

Maskell

et al. 2017

Building and Environment

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High levels of Volatile Organic Compounds (VOCs) and extremes of Relative Humidity (RH) commonly reduce indoor air quality with associated negative effects on human health and wellbeing. Interior materials are known to be one of the main contributors to poor indoor air quality. Notwithstanding, they can also act as a sink for airborne pollutants and excess moisture through adsorption. In this paper, we evaluate the ability of Medium Density Fibreboard (MDF) modified with walnut shell to regulate RH, toluene, limonene, dodecane and formaldehyde.The physicochemical properties, including molecular size/shape, vapour pressure, polarity and boiling point of VOCs allowed them to represent a range of pollutants. Adsorption and desorption behaviour of MDF containing up to 15 % walnut shell was evaluated in two-litre environmental chambers under dynamic conditions at 23 °C and 50 % RH. The porous microstructure of the MDF and walnut shell and their chemical composition were analysed using SEM, XRD and FTIR. Compared to a control panel, walnut shell additions showed an improved ability to remove VOCs and formaldehyde from the indoor air and buffer humidity. 2Of particular significance was the irreversible sink effect of formaldehyde and dodecane. This was attributed to the porous surface of walnut shell increasing the specific surface area of the panel and thus its adsorption capacity. The improved capacity of buffer humidity also increased the ability to adsorb water soluble VOCs such as formaldehyde. This research provides for the first time significant evidence that walnut shell modified MDF can improve indoor air quality. KeywordsVolatile organic compounds, Adsorption/desorption, Medium density fibre board, Walnut shell, Moisture buffering, Occupant health and wellbeing.

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Study of moisture in buildings for hot humid climates

Cited by 47 publications

References 3 publications

Application analysis of theoretical moisture penetration depths of conventional building material

Application analysis of theoretical moisture penetration depths of conventional building material

Evolution of CODYRUN from Thermal Simulation to Coupled Thermal and Daylight Simulation Software

Improvement of indoor air quality by MDF panels containing walnut shells

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