Design and development of a mini scale hot box for thermal efficiency evaluation of an insulation building block prototype used in Bahrain

Modi, Payal; Bushehri, Ranya; Georgantopoulou, Christina G.; Mavromatidis, Lazaros Elias

doi:10.1080/17512549.2016.1161545

Cited by 12 publications

(11 citation statements)

References 24 publications

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“…Following these authors, the proposed method can be a possible alternative system to be used instead of the conventional GHP apparatus. Modi et al [73] also proposed a mini-scale hot-box apparatus to evaluate the thermal performance of an insulation building block.…”

mentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behaviour of construction elements, considering laboratory conditions and in-situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GHP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy-and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of nonhomogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. hot box; calibrated hot box; infrared thermography. Highlights: -Review on the main methods to measure the U-value of non-homogeneous walls. -Methods: heat flow meter, guarded hot plate, guarded and calibrated hot box, infrared thermography. -Standards framework and discussion of the main advantages and drawbacks of each method. -Description of methodologies and working principles of laboratory and in-situ measurements. -Measurement of the thermal transmittance of different heavy-and light-weight walls.

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confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

View full text Add to dashboard Cite

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“…To date, the research community has improved the Hot Box apparatus mainly by optimising its performance and functionality [73][74][75]. Nevertheless, the Hot Box experimental approach remains the same, where only external data to the building system sampled is measured allowing for the calculation of the overall thermal resistance.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Also, no available experimental procedure allows the measurement and control of the heating boundary condition so that this could be varied in a systematic way to provide sufficient volume of data for the statistical analysis of the thermal characteristics of construction systems. Given that the Hot Box relies on the variation of the temperature of the airflow, changing the heating condition is hugely cumbersome [51,[74][75][76]. Also, the heat flux through the assembly is a function of its thermal…”

Section: Experimental Methodsmentioning

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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“…To verify the effect of particle sizes of nickel powder on thermal conductivity of epoxy resin-based composites under magnetic alignment in Figure 5, the models of sample filled with different particle sizes of Ni were established in COMSOL software (COMSOL Inc., Stockholm, Sweden) [31][32][33]. Because the agglomeration phenomenon of nano-Ni powder is serious, it is difficult to simulate the agglomeration phenomenon in the model.…”

Section: Simulation Verificationmentioning

confidence: 99%

Effect of Particle Sizes of Nickel Powder on Thermal Conductivity of Epoxy Resin-Based Composites under Magnetic Alignment

et al. 2019

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Magnetically oriented three-phase composite systems of epoxy resin, aluminum nitride, and nickel have been prepared, the thermal conductivity of composites filled with nickel powder with different particle sizes and content under different applied magnetic fields was studied. The vibrating scanning magnetometer (VSM) and scanning electron microscopy (SEM) were applied to investigate the dispersion of nickel powder in the composites. The results showed that the anisotropic thermal conductivity of the composites treated by applied magnetic field forming chain structure is obtained. The epoxy resin-based composites filled with 30 vol% aluminum nitride with particle size of 1 μm and 2 vol% nickel powder with particle size of 1 μm and aligned with vertical magnetic field have the highest thermal conductivity (1.474 W/mk), which increases the thermal conductivity of the composites by 737% and 58% compared to the pure epoxy resin (0.2 W/mk) and the composites filled with 30 vol% aluminum nitride (0.933 W/mk). In addition, we simulated the influence of nickel powder particles with different particle sizes and arrangements on the thermal conductivity of the composite material in COMSOL Multiphysics software, and the results were consistent with the experimental results.

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Design and development of a mini scale hot box for thermal efficiency evaluation of an insulation building block prototype used in Bahrain

Cited by 12 publications

References 24 publications

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Building Design Optimization: Integration of Thermal and Fire Performance

Effect of Particle Sizes of Nickel Powder on Thermal Conductivity of Epoxy Resin-Based Composites under Magnetic Alignment

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