Insulation materials for the building sector: A review and comparative analysis

Schiavoni, Samuele; D’Alessandro, Francesco; Bianchi, Francesco; Asdrubali, Francesco

doi:10.1016/j.rser.2016.05.045

Cited by 734 publications

(397 citation statements)

References 81 publications

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“…The dominant component is gaseous heat transfer with standard commercial product values ranging 0.035 -0.040 W/m.K [28]. Insulation performance is derived through suppression of micro-void natural convection in the material physical structure [13].…”

Section: Reviewmentioning

confidence: 99%

“…Commercial superinsulation performance is attributed to a physical structure size reduction from micro-to nano-scale; examples including aerogels and vacuum insulated panels (VIPs). A resultant suppression of convection emerges through the mean free-path of trapped gas molecules equalling that of the mean-diameter of the voids in the physical structure, leading to conductivities ranging 0.005 -0.015 W/m.K [28,30]. A phenomenon known as the Knudsen effect [13].…”

Section: Commercial and Super Insulation Heat Transfermentioning

confidence: 99%

“…Higher-spec polymer products use blowing agents to replace air during manufacture, enabling conductivities ranging 0.018 -0.028 W/m.K. [28,29]. Commercial superinsulation performance is attributed to a physical structure size reduction from micro-to nano-scale; examples including aerogels and vacuum insulated panels (VIPs).…”

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confidence: 99%

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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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Section: Reviewmentioning

confidence: 99%

Section: Commercial and Super Insulation Heat Transfermentioning

confidence: 99%

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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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“…This could be solved by placing the AAFW system in a greenhouse with adjustable temperature and light intensity. Although Guterstam (1996) suggested that such an approach is detrimental due to high energy consumption, since his research there has been a rapid development in alternative and low-cost energy supply technology (Lund et al, 2014) and also new and efficient insulation materials have been introduced (Schiavoni et al, 2016). Thus, costs for thermal and electrical energy can be significantly reduced.…”

Section: An Overview On State-of-the-art For Prospect Of Applicationmentioning

confidence: 99%

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Lavrinovičs

Juhna

2017

Journal of Water Security

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Abstract. Eutrophication-promoting phosphorous loads originating from wastewater treatment plants are commonly controlled by chemical precipitation in the tertiary treatment phase. However, this approach is costly and generates additional waste. Therefore, inexpensive and sustainable methods for wastewater post-treatment are wanted. The artificial aquatic food-web that performs wastewater phycoremediation by algae and subsequent biomass harvest by filter-feeding organisms not only requires low energy consumption but also produces biomass for treatment process cost recovery. Still, the knowledge on its performance at different scales and under different climates are limited. In this review, the application possibilities of the artificial aquatic food-web for domestic wastewater post-treatment is discussed, focusing on its use in cold climate regions. Considering the reduced biological activity of aquatic organisms at low ambient temperature, possible solutions for its performance and prospect application at low temperatures are suggested. Finally, directions for future research regarding the practical use of artificial aquatic food-web are highlighted.

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“…Water vapor resistance (μ) is a dimensionless parameter used to evaluate the vapor permeability of building materials in comparison to the unitary value assigned to air. Schiavoni and collaborators [7], present a broad compilation of μ-values of building materials, showing that the insulation materials have higher μ-values.…”

Section: Introductionmentioning

confidence: 99%

Computational study of transient conjugate conductive heat transfer in light porous building walls

Báez

Vasco

Díaz

et al. 2017

Ingeniare. Rev. chil. ing.

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The present work was originally carried out as a project by HVAC-R engineering students of a heat transfer undergraduate course. The main goal was to introduce to the students to the implementation of a commercial simulation tool, ANSYS/Transient thermal, to analyze a transient heat transfer process of their professional interest. Behind this goal there were a set of activities that lead students to learn very important lessons that deal with computational simulation: physical and mathematical modeling, validation, measurement of thermal properties and grid size analysis. Specifically, a computational simulation of the transient cooling process of two composed building walls initially at 20 ºC was performed. Boundary conditions of third kind were imposed at the outer surfaces of the walls. The composed walls are made of light materials: oriented strand board and plasterboard, which are porous building materials and whose thermal properties can be improved by imbibe them with phase change materials (PCM). The convective heat transfer coefficients were taken from the Chilean normative (Nch853-Of91) and some of the thermophysical properties were experimentally obtained.Keywords: Conjugate transient heat conduction, heating, oriented strand board, plasterboard. RESUMEN El presente trabajo surgió originalmente como un proyecto de un curso de transferencia de calor para estudiantes de ingeniería en climatización. El objetivo del proyecto era introducir a los estudiantes al uso de una herramienta computacional comercial, ANSYS / Transient thermal

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Insulation materials for the building sector: A review and comparative analysis

Cited by 734 publications

References 81 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

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Computational study of transient conjugate conductive heat transfer in light porous building walls

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