The effect of drying condition of glassfibre core material on the thermal conductivity of vacuum insulation panel

Li, Chengdong; Duan, Zheng-Cai; Qing, Chen; Chen, Zhaofeng; Boafo, Fred Edmond; Wu, Wenbin; Zhou, Jie-Ming

doi:10.1016/j.matdes.2013.03.021

Cited by 30 publications

(13 citation statements)

References 31 publications

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“…New Material Co. Ltd. The general manufacturing process of glass fibre VIP core material has been reported elsewhere [12,16]. In addition to the reported manufacturing process, CaCO 3 powders were dissolved in the aqueous slurry pool tub.…”

Section: Methodsmentioning

confidence: 99%

“…The most common VIP purposely used for building applications in China is composed of centrifugal glass fibre core material encapsulated in a laminated aluminium foil envelope material. Glass fibres are widely used as a VIP core material due to their excellent moulding properties, low density, outstanding thermal and acoustic insulation properties, as well as superior chemical and thermal stability (>1000 • C) [12]. Other common types of glass fibres used as core material for other purposes include flame attenuated glass fibre mat, aerocor glass fibre mat, and chopped strand glass fibre mat.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies on concrete wall systems [6], wooden door systems [13], terrace constructions [14], and flat roof constructions [15], insulated with VIPs in some European countries, have been reported in literature. Likewise, the manufacturing process and parameters, and some durability issues related to glass fibre VIPs have been studied by experimental and modelling techniques [12,[16][17][18]. However, to the best of our knowledge, no studies have focused on the procedures for installation method and performance of glass fibre VIP, especially in building structures in China.…”

Section: Introductionmentioning

confidence: 99%

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Structure of vacuum insulation panel in building system

Boafo

Chen

et al. 2014

Energy and Buildings

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure of vacuum insulation panel in building system

Boafo

Chen

et al. 2014

Energy and Buildings

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“…This was done through a temperature controlled laboratory oven (salvis LAB) having a stability of +/-0.3 °C, and constant forced air movement [22]. Various drying temperatures where tested to ascertain the physical impacts to the particles when subject to heat.…”

Section: Preparation Of the Vacuum Insulated Panels With Nano-cellulomentioning

confidence: 99%

“…Being the constituent that incorporates the bulk of the VIP embodied energy, recent research advances have focussed on VIP core innovations, including studies by Nemanic et al [19], Nemanič and Žumer [20], Chen et al [21], Li et al [22][23][24], Chang et al [25], and Choi et al [26]. Albeit comprehensive, the focus of these articles leaned towards the physical impacts of fumed silica based core material innovations.…”

Section: Introductionmentioning

confidence: 99%

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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Entwicklung einer multifunktionalen Innenwanddämmung unter Verwendung hochdämmender, dünner, innovativer Glasfaser‐VIP

Kaufmann¹,

Mai²,

Baars³

et al. 2020

Bauphysik

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Vakuum-Isolations-Paneele (kurz VIP) stellen zunehmend eine Alternative zu bekannten Dämmstoffen dar. Die acht-bis zehnfach dünnere Dämmstärke bei gleichem Wärmedurchlasswiderstand erweist sich in sehr vielen Baukonstruktionen als enormer Vorteil. Die Wirksamkeit konventioneller Dämmstoffe beruht darauf, dass möglichst viel Luft mit möglichst wenig Material in möglichst kleinen Zellen eingeschlossen wird. Dämmstoffe sind daher in der Regel leichte Materialien, d. h. sie enthalten wenig Feststoff im Vergleich zu Baustoffen wie Backstein, Beton, Glas oder auch Holz. Vakuum-Isolations-Paneele bestehen im Wesentlichen aus einem Kernmaterial, welches in einer Vakuumkammer in ein hoch gasdichtes Hüllmaterial ein-geschweißt wird. Das Vakuum spielt dabei die Schlüsselrolle, denn die Wärmeleitfä-higkeit dieser Art von Dämmstoffen wird maßgeblich durch die Wärmeleitung des eingeschlossenen Gases bestimmt. Durch die Evakuierung wird diese Gasleitung unterbunden. Die führenden Produkte auf dem Markt sind dabei Vakuum-Isolations-Paneele mit Stützkernen aus pyrogener Kieselsäure. Dies ist ein mineralisches, nanoporöses Pulver, das bereits bei Normaldruck sehr gute Wärmeleitfähigkeitswerte von nur 18 mW/mK aufweist. Die Wärmeleitfähigkeit eines evakuierten VIP nach Stand der Technik beträgt unmittelbar nach der Herstellung (ohne Einfluss der Wärmebrücken-Randeffekte) etwa 4 mW/mK. In der Vergangenheit wurden verschiedene Füllmaterialien untersucht. Typische Füllmaterialien sind offenporige Schäume auf Basis von Polystyrol, Polyurethan oder Faserdämmstoffe, z. B. getemperte Glasfaserboards und Pul-Gesamtziel des Forschungs-und Entwicklungsvorhabens war die Verfahrens-und Produktentwicklung hochdämmender, kostengünstiger Bauelemente geringer Dicke mit Glasfaserstützkern sowie die Entwicklung und Erprobung konstruktiver und technologischer Lösungen für diverse Applikationen mit höchsten Anforderungen an die Wärmedämmung und Energieeffizienz. Die Motivation für die durchgeführte Entwicklung ergab sich aus dem dringenden Bedarf an dünnen, kosteneffektiven, hochisolierenden Materialien in verschiedenen Anwendungsbereichen zur Erhöhung der Energieeffizienz durch Minimierung von Energieverlusten. Die steigenden Isolationsanforderungen (u. a. gegeben durch EnEV 2014/2016, Pariser Klimaabkommen) können mit herkömmlichen Dämmmaterialien wie Mineralwolle, Polyurethanschaum oder extrudierter Polystyrolschaum aufgrund ihrer vergleichsweisen hohen Wärmeleitfähigkeiten (20-40 mW/mK) nicht erfüllt werden. Um hochisolierende Anforderungen zu erreichen, müssen hochdämmende Materialien mit extrem niedrigen Wärmeleitfähigkeiten verwendet werden, wie zum Beispiel Vakuum-Isolations-Paneele (VIP). Ziel des Projektes war die Werkstoff-und Verfahrensentwicklung eines hochdämmenden (ca. 2,5 mW/mK), langlebigen (ca. 30 Jahre), temperaturbeständigen (ca. 300 °C), verletzungsbeständigeren Glasfaser-VIP sowie die Entwicklung innovativer Applikationen im Bereich Bauwesen (Innenwanddämmung), Behälterbau sowie Containerbau mit höchsten Anforderungen an die Wärm...

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The effect of drying condition of glassfibre core material on the thermal conductivity of vacuum insulation panel

Cited by 30 publications

References 31 publications

Structure of vacuum insulation panel in building system

Structure of vacuum insulation panel in building system

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

Entwicklung einer multifunktionalen Innenwanddämmung unter Verwendung hochdämmender, dünner, innovativer Glasfaser‐VIP

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