Moisture Buffer Value of Building Materials

Rode, Carsten; Peuhkuri, Ruut Hannele; Time, Berit; Svennberg, Kaisa; Ojanen, Tuomo; Mukhopadhyaya, P.; Kumaran, M.; Dean, S. W.

doi:10.1520/jai100369

Cited by 96 publications

(35 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Information from other fields, e.g., building physics and indoor air quality, may reveal interesting approaches and simplifications [29][30][31][32][33]. Modelling typical air change rates, moisture supply, and the indoor wood Fuel Moisture Content (FMC) may therefore be possible.…”

Section: Discussionmentioning

confidence: 99%

“…The building fabric, i.e., internal surfaces, such as wooden flooring, walls, and ceiling materials, as well as the furniture, may buffer changes in indoor relative humidity, especially for fast variations in ambient conditions [29]. These objects may release or absorb significant amounts of humidity depending on the previous history.…”

Section: Predicting Indoor Relative Humidity Based On Ambient Air Promentioning

confidence: 99%

See 1 more Smart Citation

Cold Climate Structural Fire Danger Rating System?

Metallinou

Log

2018

Challenges

View full text Add to dashboard Cite

Worldwide, fires kill 300,000 people every year. The fire season is usually recognized to be in the warmer periods of the year. Recent research has, however, demonstrated that the colder season also has major challenges regarding severe fires, especially in inhabited (heated) wood-based structures in cold-climate areas. Knowledge about the effect of dry cellulose-based materials on fire development, indoor and outdoor, is a motivation for monitoring possible changes in potential fire behavior and associated fire risk. The effect of wind in spreading fires to neighboring structures points towards using weather forecasts as information on potential fire spread behavior. As modern weather forecasts include temperature and relative humidity predictions, there may already be sufficient information available to develop a structural fire danger rating system. Such a system may include the following steps: (1) Record weather forecasts and actual temperature and relative humidity inside and outside selected structures; (2) Develop a meteorology-data-based model to predict indoor relative humidity levels; (3) Perform controlled drying chamber experiments involving typical hygroscopic fire fuel; (4) Compare the results to the recorded values in selected structures; and (5) Develop the risk model involving the results from drying chamber experiments, weather forecasts, and separation between structures. Knowledge about the structures at risk and their use is also important. The benefits of an automated fire danger rating system would be that the society can better plan for potentially severe cold-climate fires and thereby limit the negative impacts of such fires.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Predicting Indoor Relative Humidity Based On Ambient Air Promentioning

confidence: 99%

Cold Climate Structural Fire Danger Rating System?

Metallinou

Log

2018

Challenges

View full text Add to dashboard Cite

show abstract

“…The moisture buffer performance of a room is the ability of the materials within the room to moderate variations in the relative humidity. The NORDTEST Project [17,18] and the Japanese Industrial…”

Section: Introductionmentioning

confidence: 99%

Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

Palumbo

Palacio

Holcroft

et al. 2016

Construction and Building Materials

100

View full text Add to dashboard Cite

The development and application of bio-based insulation materials can contribute to the minimization of the environmental impacts of buildings through reduction of embodied and in-use energy demand, in addition to many other major impacts such as resource depletion and waste generation. The hygrothermal performance of natural building materials has direct and indirect impacts on moderating indoor environmental conditions and can contribute to energy savings provided that such aspects are taken into account during the design and construction phases. This requires in-depth knowledge of the thermal and hygroscopic properties of the materials and their dependence on the moisture content. In this paper, the hygrothermal properties of six insulation materials is determined; four are commercially available materials while the other two are experimental materials based on crop byproducts and natural binders. The influence of relative humidity on such properties is analysed.Moreover, the experimental Moisture Buffer Values are obtained for the six insulations, according to the protocol of the standard ISO 24353. Finally, a mass and heat coupled model is numerically solved to simulate this protocol for two of the materials, obtaining a good agreement with the experimental results.

show abstract

“…In recent years designers and researchers have been looking for low energy design strategies, which bring into spotlight the moisture buffering concept in the indoor environment [3]. This property is the capacity of hygroscopic materials, like clay and gypsum, to adsorb and desorb water vapour from the indoor air, reducing the extreme highs and lows of RH in the indoor environment.…”

Section: Introductionmentioning

confidence: 99%

“…The wider use of those materials on indoor surfaces has the ability to moderate indoor humidity fluctuations, potentially reducing operational energy use and improving indoor hygrothermal comfort and air quality. Experimental tests, based on the step-response method such as the NORDTEST protocols [3], ISO 24353 [4] and JIS A 1470-1 [5], were developed to measure and compare the moisture buffering capacity of materials. These tests methods are applied in a controlled environment, in which temperature is constant and humidity varies, by following a square wave function [6].…”

Section: Introductionmentioning

confidence: 99%

The response of clay plaster to temperature and RH sinusoidal variations

et al. 2019

View full text Add to dashboard Cite

Hygroscopic finishing materials can be used to moderate indoor humidity levels; they have the capacity to adsorb and release moisture from and to the surrounding air, depending on the indoor relative humidity levels. To determine the moisture buffering properties of materials several protocols have been introduced. However, testing procedures are based on a time-response method, where humidity variations are under a square wave function and temperature remains constant. Therefore, the ability of these methods to simulate material behaviour under real conditions, where cyclical humidity variations are more gradual, and temperature is variable, has been called into question. The aim of this study is to perform a standard moisture buffering test, by substituting the step-variation method, with a sinusoidal humidity function at different temperatures. Clay has been used to perform the tests in a climatic chamber, where a small increase of relative humidity have been set, in order to obtain a quasi-sinusoidal curve. The relative humidity variation are limited by low humidity (33% RH) and high humidity (75% RH) and temperature variation between 18 °C and 28 °C. Materials tested present a lag in the response to the peak relative humidity to peak mass gain, which suggests an alternative way to consider the rate of sorption and the moisture storage function. The significance of the paper is to develop a laboratory test that can be more readily compared with the behaviour real buildings, which operate under more of a sine waveform

show abstract

Moisture Buffer Value of Building Materials

Cited by 96 publications

References 2 publications

Cold Climate Structural Fire Danger Rating System?

Cold Climate Structural Fire Danger Rating System?

Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

The response of clay plaster to temperature and RH sinusoidal variations

Contact Info

Product

Resources

About