Newspaper sandwiched aerated lightweight concrete wall panels—Thermal inertia, transient thermal behavior and surface temperature prediction

Ng, Soon-Ching; Low, Kaw-Sai; Tioh, N. H.

doi:10.1016/j.enbuild.2011.03.007

Cited by 34 publications

(12 citation statements)

References 17 publications

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“…The time lag (ϕ) and the decrement factor ( f ) [30,31] are determined by the following equations (Equations (1) and (2)). Φ = τ qi,max − τ qe,max f = normalAnormalinormalAnormale = qi,max − qi,minqe,max − qe,min where τ qi,max is the times at the maximum interior wall surface heat flux and τ qe,max is the times at the maximum exterior wall surface heat flux.…”

Section: Resultsmentioning

confidence: 99%

Thermal Effectiveness Enhancement of Autoclaved Aerated Concrete Wall with PCM-Contained Conical Holes to Reduce the Cooling Load

et al. 2019

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This work investigates and improves the thermal dynamics of autoclaved aerated concrete (AAC) wall containing phase change material (PCM). The PCM is paraffin wax loaded into conical holes drilled into the AAC. Filled AAC with three different numbers of PCM-filled holes (2, 3, and 4 conical holes, which are designated as AAC-2H, AAC-3H, and AAC-4H, respectively) as well as the unfilled original AAC were both tested under two different conditions: indoors (with controlled temperature) and outdoors (with actual weather). For the indoor experiment, a heater was used as a thermal source and set up to maintain the testing temperature at one of three levels: 40 °C, 50 °C, or 60 °C. The wall temperature was then measured on the surface with each horizontally-positioned wall as well as four different positions at various depths below the surface of the wall. It was found that AAC-4H was the optimum condition, which can produce outstandingly a time lag of approximately 27%, reduce a decrement factor of approximately 31%, and also decrease the room temperature. This reached approximately 9% when compared with that of ordinary AAC at the controlled testing temperature of 60 °C. All samples were further tested in actual weather to confirm the thermal performances of AAC-4H. Thermal effectiveness of AAC-4H was improved by extending approximately a 14.3% time lag, which reduces approximately a 4.3% decrement factor and achieving approximately 5% lower room temperature when compared with ordinary AAC.

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Section: Resultsmentioning

confidence: 99%

Thermal Effectiveness Enhancement of Autoclaved Aerated Concrete Wall with PCM-Contained Conical Holes to Reduce the Cooling Load

et al. 2019

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“…Thermal inertia of the building envelope is one of the most important parameters for reducing this impact. According to Ng et al [5], thermal inertia refers to the degree of slowness with which the temperature of a body approaches its surroundings.…”

Section: Introductionmentioning

confidence: 99%

A new procedure for the experimental measurement of the effective heat capacity of wall elements

Faye

Lartigue

Sabourin

2015

Energy and Buildings

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“…Numerically, this study found that numerical methods have been used by the research community mostly to calculate the decrement factor by following Eq. (43) approach, that may be used to understand a significant number of research topics [78][79][80][86][87][88]. Nevertheless, for this project, it is found convenient to explore more refined work done to calculate the cyclic thermal transmittance numerically, so that decrement factors can also be obtained, together with the surface admittance.…”

Section: Methodsmentioning

confidence: 99%

“…The decrement factor is also described by Eq (43). where the outdoor temperature amplitude is compared with the indoor temperature amplitude[3,[78][79][80]. Variation of the cyclic transmittance value with increasing cyclic periods.…”

mentioning

confidence: 99%

Building Design Optimization: Integration of Thermal and Fire Performance

Soret-Cantero¹

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The main objective pursued by a fire safety strategy defined for a building design is to achieve an appropriate safe egress time required by the occupants under any fire scenario. This time must be shorter than the fire growth rate, profoundly influenced by the material flammability characteristics of building components. As witnessed in recent fire scenarios, this egress time can be severely compromised by the flammability of innovative building assemblies that include light and combustible materials which are suitable for thermal insulation and provide an easy and affordable way to comply with strict energy efficiency building code requirements. This study analysed the potential conflict between the assessment of thermal insulation and flammability characteristics such as the onset of ignition through heat transfer fundamentals. It was concluded that material properties like the density needed to control flammability characteristics are not evaluated by the current energy efficiency approach adopted by most building policies. By addressing this issue, this study focussed on the development of an integrated assessment method to attain optimised design solutions from where the best insulating properties for a particular geographical location is achieved together with adequate fire safety performance. During my Doctor of Philosophy period, my knowledge and understanding of buildings have been highly enhanced thanks to the invaluable support, time and kind help of many people. As a result, I have been enriched personally, and indeed, the attention received encourages me to share and promote the constructive attitude that I received.

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Newspaper sandwiched aerated lightweight concrete wall panels—Thermal inertia, transient thermal behavior and surface temperature prediction

Cited by 34 publications

References 17 publications

Thermal Effectiveness Enhancement of Autoclaved Aerated Concrete Wall with PCM-Contained Conical Holes to Reduce the Cooling Load

Thermal Effectiveness Enhancement of Autoclaved Aerated Concrete Wall with PCM-Contained Conical Holes to Reduce the Cooling Load

A new procedure for the experimental measurement of the effective heat capacity of wall elements

Building Design Optimization: Integration of Thermal and Fire Performance

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