Influence of Moisture and Moisture Gradients on Heat Transfer Through Porous Building Materials

Bomberg, Mark; Shirtliffe, CJ

doi:10.1520/stp35746s

Cited by 35 publications

(24 citation statements)

References 9 publications

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“…For example, it can be used to detect where and how energy is leaking from a building envelope. Besides the detection of heat loss, IRT is also used to discover other anomalies, such as water infiltration and moisture [ 36 , 37 ]. A wet mass in a wall has a differentiated thermal inertia that can be discovered using IRT.…”

Section: Introductionmentioning

confidence: 99%

Infrared Thermography for Temperature Measurement and Non-Destructive Testing

Usamentiaga

Venegas²,

Guerediaga³

et al. 2014

Sensors

769

446

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The intensity of the infrared radiation emitted by objects is mainly a function of their temperature. In infrared thermography, this feature is used for multiple purposes: as a health indicator in medical applications, as a sign of malfunction in mechanical and electrical maintenance or as an indicator of heat loss in buildings. This paper presents a review of infrared thermography especially focused on two applications: temperature measurement and non-destructive testing, two of the main fields where infrared thermography-based sensors are used. A general introduction to infrared thermography and the common procedures for temperature measurement and non-destructive testing are presented. Furthermore, developments in these fields and recent advances are reviewed.

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Section: Introductionmentioning

confidence: 99%

Infrared Thermography for Temperature Measurement and Non-Destructive Testing

Usamentiaga

Venegas²,

Guerediaga³

et al. 2014

Sensors

769

446

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“…This software, developed at the Fraunhofer Institute for Building Physics (Germany), permits an assessment of changes in the moisture content and temperature inside structures depending on interior and exterior climatic conditions [32][33][34]. The use of the software for the numerical simulation requires knowledge of boundary conditions and thermal and moisture-related properties of the materials used [35,36].…”

Section: Simulation Program Used and Validationmentioning

confidence: 99%

Underground Air Duct to Control Rising Moisture in Historic Buildings: Improved Design and Its Drying Efficiency

2017

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Abstract. The underground air ducts along peripheral walls of a building are a remediation method, which principle is to enable an air flow along the moist building structure's surface to allow a sufficient evaporation of moisture from the structure. This measure reduces the water transport (rising moisture) into the higher parts of the wall where the high water content in masonry is undesirable. Presently, underground air ducts are designed as masonry structures, which durability in contact with ground moisture is limited. The article describes a new design of an underground air duct, which is based on specially shaped concrete blocks (without wet processes, because the blocks are completely precast). The air duct from concrete blocks is situated completely below the ground surface (exterior) or below the floor (interior). Thanks to this, the system is invisible and does not disturb the authentic look of rehabilitated historic buildings. The efficiency of the air duct technical solution was verified by the results of tests (based on the measured moisture values) conducted on a laboratory model. The experimental study showed that the moisture in the masonry equipped with the presented underground air duct had decreased considerably compared to the reference sample, namely by 43 % on average. The experimental study was numerically validated through numerical simulations performed with the program WUFI 2D.

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“…conducted. This effect is acknowledged by nearly every author, and has been the subject of many thorough investigations [7,16,18,19,20,22,27,29]. Variations can also be due to differences in where water is concentrated within the insulation as the testing is conducted.…”

Section: In the Early 1970smentioning

confidence: 99%

Assessment of technologies for constructing self-drying low-slope roofs

Kyle¹,

Desjarlais²

1994

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Association for their thorough reviews and constructive comments. We also wish to thank Jeffrey E. Christian for continuing support of our activities in this area. Finally, thanks to LeRoy GiUiam, who produced most of the graphics for this report, and to Deborah Counee and Carolyn Moser, who edited the report and readied it for publication. xi ABSTRAC_ Issues associated with removing excessive moisture from low-slope roofs have been assessed. The economic costs associated with moisture trapped in existing roofs have been estimated. Based on the limited amount of _vailable data, the evidence suggests that existing moisture levels cause approximately a 40% overall reduction in the R-value of installed roofing insulation in the United States. Excess operating costs are further increased by a summertime heat transfer mode unique to wet insulation, caused by the daily migration of water within the roof. By itself, this effect can increase peak electrical demand for air conditioning by roughly 15 W/m2 of roofing, depending on the type of insulation. This effect will increase peak demand capacity required of utilities in any geographic region (e.g., 900 MW in the South). A simple formula has been derived for predicting the effect that self-drying roofs can have upon time-averaged construction costs. It is presumed that time-averaged costs depend predominantly upon (1) actual service life and (2) the likelihood that the less expensive recover membranes can be installed safely over old roofs. For example, an increase in service life from 15 to 20 years should reduce the current cost of roofing ($12 billion/year) by 21%. Another simple formula for predicting the reroofing waste volume indicates that an increase in service life from 15 to 20 years might reduce the current estimated 0.4 billion ft3/year of waste by 25%.

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Influence of Moisture and Moisture Gradients on Heat Transfer Through Porous Building Materials

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Cited by 35 publications

References 9 publications

Infrared Thermography for Temperature Measurement and Non-Destructive Testing

Infrared Thermography for Temperature Measurement and Non-Destructive Testing

Underground Air Duct to Control Rising Moisture in Historic Buildings: Improved Design and Its Drying Efficiency

Assessment of technologies for constructing self-drying low-slope roofs

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