Thermal insulation property and service life of vacuum insulation panels with glass fiber chopped strand as core materials

Di, Xiaobo; Gao, Yimin; Bao, Chonggao

doi:10.1016/j.enbuild.2014.01.010

Cited by 43 publications

(15 citation statements)

References 18 publications

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“…This assertion was confirmed experimentally in studies by Isaia et al [14], Alam et al [17], Kwon et al [30], and Di et al [32]:…”

Section: Commercial and Super Insulation Heat Transfersupporting

confidence: 73%

“…It has been shown more efficient to measure total thermal conductivity directly, than to predict the effect of changing one component. This was shown by Lorentzati et al [16], Alam et al [17], Chen et al [21], and Di et al [32]. In standard modelling thermal conductivity is separated into the following components, these dependent on underlying physical processes [27]:…”

Section: Commercial and Super Insulation Heat Transfermentioning

confidence: 98%

“…Fricke et al [2,33] reported the differential curve for thermal conductivity and pressure for various core materials, providing the methodology to calculate the effective average pore diameter (φ) using experimental data. This was calculated using the variation with gas constant (λ 0 /2), with air as the gas removed (Equation 4 and Figure 6); these works have been cited in multiple studies since their publication [8,13,32,34].…”

Section: Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

Tetlow

Simon

Liew

et al. 2017

Energy and Buildings

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Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications, Energy and Buildingshttp://dx.doi.org/10. 1016/j.enbuild.2017.08.058 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis article investigates impact of substituting fumed silica with a cellulosic-crystal innovation in a commercial Vacuum Insulated Panel (VIP) core. High building performance demands have attracted VIP technology investment to increase production capacity and reduce cost. In building retrofit VIPs resolve practical problems on space saving that conventional insulations are unsuitable for. Three challenges exists in fumed silica: cost, low sustainability properties, and manufacture technical maturity. Cellulosic nano-crystal (CNC) technology is in its infancy and was identified as a possible alternative due to a similar physical nano-structure, and biodegradability. The study aim was to determine a performance starting point and establish how this compares with the current benchmarks. Laboratory cellulosic-crystal samples were produced and supplied for incorporation into commercial VIP manufacture. A selection of cellulosic-panels with core densities ranging 127 -170 kg/m 3 were produced. Thermal conductivities were tested at a pressure of 1 Pa (0.01 mBar), with the results compared against a selection of fumed silica-VIPs with core densities ranging 144 -180 kg/m 3 . Conductivity tests were then done on a cellulosic-VIP with 140 kg/m 3 density, under variable pressures ranging 1 -100,000 Pa (0.01 -1000 mBar). This investigated panel lifespan performance, with comparisons made to a fumed silica-VIP of similar core density. Manufactured cellulosic-samples were found unsuitable as a commercial substitute, with performance below current standards. Areas for cellulosic nano-material technology development were identified that show large scope for improvement. Pursuit could create a new generation of insulation materials that resolve problems associated with current commercial versions. This is most applicable in building retrofit where large ranges of domestic and commercial cases are marginalised from their construction markets due to impracticalities and high upgrade costs. This being a problem in multiple economies globally. Figure 3 with typical layer thicknesses [1,13].VIP thermal conductivities are five to ten times lower than commercial insulations, with the centreof-panel reaching 4 mW/m.K [3,4,14,16]. Albeit excellent performance, the technology is expensive with panel prices multiples of five to ten that of standard insulations [...

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“…This assertion was confirmed experimentally in studies by Isaia et al [14], Alam et al [17], Kwon et al [30], and Di et al [32]:…”

Section: Commercial and Super Insulation Heat Transfersupporting

confidence: 73%

Section: Commercial and Super Insulation Heat Transfermentioning

confidence: 98%

Section: Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

Tetlow

Simon

Liew

et al. 2017

Energy and Buildings

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“…of VIPs can be founded in the literature. The typical models for VIPs with different core materials have been presented by Jae Sung Kwon et al (Kim & Song 2013;Caps & Fricke 2000;Di et al 2013;Di et al 2014). Special emphasis on the solid conduction is theoretically investigated and transport mechanisms of three core materials are numerically analyzed.…”

Section: Introductionmentioning

confidence: 99%

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

Kan

Kang

Wang

et al. 2015

Future Cities and Environment

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The excellent thermal insulation performance of vacuum insulation panels (VIPs) make them widely applied in energy conservation fields, especially in buildings engineering. This research work proposes a simple, yet extremely effective, alternative model for prediction of the effective thermal conductivity (ETC.) of VIPs. The ETC. of VIPs is function of the thermal conductivity of the core materials, the equivalent thermal conductivity of the rarefied gas embraced in the core and the equivalent thermal conductivity of radiation in the early studies. The micro structure of the porous core materials and vacuum degree are taken into consideration and the prediction numerical model for the ECT of VIPs is developed. The relationship of the vacuum degree versus the ETC. is theoretical analyzed. Three types VIPs are made from the polyurethane foam materials, superfine fibrous materials and nano-granular silica materials as the core materials. For each type, the vacuum degree and the thermal conductivity are collected, including the comparison between the testing results and the prediction model. The agreement between the model and the experimental results is fairly well when the air pressure is very low. The vacuum maintaining and service life of the VIPs are also discussed. The research work is meaningful for the enhancement of stability and the development of vacuum insulation panels.

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“…According to the study of Jiang et al [12], if these materials cause fire, then it can spread quickly in an entire building and toxic gases can be released [16] In addition, many countries have incorporated into their building standard laws the prohibition of using conventional insulation materials that are inflammable. For instance, the French Standard NF P92-510 as well as the European classification standards EN 13501-1 and EN ISO 1182 all emphasize the dangers of using flammable materials as insulators as well as prohibit their use [17,18]. Moreover, traditional insulation materials increase the thickness of building envelopes, which may cause a significant loss of indoor space area [19].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Energy Performance of Fumed Silica Vacuum Insulation Panels in an Apartment Building

2017

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Abstract:Building insulation materials has a significant impact on building energy consumptions. However, conventional materials are easily flammable and can cause fire disasters in buildings. Therefore, it is important to select appropriate insulation materials for building energy efficiency and safety and Vacuum Insulation Panels (VIPs) are increasingly applied to building insulation. Considering this, the present study investigates energy performance of VIPs with design alternatives, such as window systems, infiltration rates, etc., by using energy simulation. Among various VIPs, fumes silica VIPs were chosen. In addition, eight combinations were compared to find the best energy efficient design conditions. The results of the present study showed that building energy performance can be improved with an appropriate combination of design options including fumed silica VIPs.

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Thermal insulation property and service life of vacuum insulation panels with glass fiber chopped strand as core materials

Cited by 43 publications

References 18 publications

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

A Comparative Study of Energy Performance of Fumed Silica Vacuum Insulation Panels in an Apartment Building

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