Thermal conductivities study on silica aerogel and its composite insulation materials

Wei, Gaosheng; Li, Yingfeng; Zhang, Xinxin; Yu, Fan; Du, Xiaoze

doi:10.1016/j.ijheatmasstransfer.2011.02.026

Cited by 407 publications

(184 citation statements)

References 28 publications

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“…In comparison with monolithic aerogels they exhibit much more durability and stability. In literature there are many mathematical models and experimental research results confirming the outstanding thermal performance of aerogel blankets [4,5,[10][11][12][13][14].…”

Section: Fields Of Applicationsmentioning

confidence: 93%

Properties, applications and thermal investigation of aerogels

Tychanicz

Smusz

2017

ZN PRz Mechanika

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Among the variety of products for thermal insulation in industry the aerogel blankets have received significant attention because of their unique properties and wide range of applications. This paper presents the basic properties, fields of application and results of experimental study of Pyrogel XT, which is a type of high temperature aerogel blanket. It is formed of silica aerogel and reinforced with glass fiber batting. In comparison with traditional insulating materials Pyrogel XT is much more efficient thermal insulation with wide temperature range of application (-40÷650ºC). It also has the lowest thermal conductivity of any known solid material. Experimental investigation of thermophysical properties of Pyrogel XT was carried out by using traditional and modern research methods. The traditional method utilized a simplified single-plate Poensgen apparatus. The modern approach was performed on a Unitherm TM model 2022 thermal conductivity instrument which uses a guarded heat flow meter method according to ASTM E1530 standard. Results obtained from both devices were compared and analyzed.

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Section: Fields Of Applicationsmentioning

confidence: 93%

Properties, applications and thermal investigation of aerogels

Tychanicz

Smusz

2017

ZN PRz Mechanika

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“…Besides, the nanoscaled solid structure of aerogels has a significant effect on the gaseous thermal conductivity, particularly for pressures between 0.01 × 10 5 Pa and 100 × 10 5 Pa [63]. The impact of radiation on the overall thermal conductivity of aerogels can be substantial from ambient conditions to high temperatures (above 200 ∘ C) due to their low absorption for the infrared [10]. Radiative conductivity can be calculated by [60] …”

Section: Thermal Propertiesmentioning

confidence: 99%

“…Today, one of the most focusing areas is the modeling of the thermal behavior of granular-and fiber-based silica aerogel and its composites [9][10][11][12][13]. Despite all these efforts, silica aerogel has been applied only for scientific motives in the aerospace industry.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Silica Aerogels: An Overview

Parale¹,

Lee²,

Park³

2017

J. Korean Ceram. Soc

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Aerogels are highly porous structures prepared via a sol-gel process and supercritical drying technology. Among the classes of aerogels, silica aerogel exhibits the most remarkable physical properties, possessing lower density, thermal conductivity, refractive index, and dielectric constant than any solids. Its acoustical property is such that it can absorb the sound waves reducing speed to 100 m/s compared to 332 m/s for air. However, when it comes to commercialization, the result is not as expected. It seems that mass production, particularly in the aerospace industry, has dawdled behind. This paper highlights the evolution of aerogels in general and discusses the functions and significances of silica aerogel in previous astronautical applications. Future outer-space applications have been proposed as per the current research trend. Finally, the implementation of conventional silica aerogel in aeronautics is argued with an alternative known as Maerogel.

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“…A typical method to make aerogel composites involves molding a silica gel around a supporting (xonotlite-type calcium silicate) structure, followed by the drying process, then mixing with a polymer binder (often a type of polyester [e.g., polyethylene terephthalate]) to make the aerogel blanket (Wei et al 2011, Frank et al 1998. Three types of aerogel insulation materials were tested in this project.…”

Section: Aerogel Blanksmentioning

confidence: 99%

Prediction of Long Term Degradation of Insulating Materials

Stephenson¹,

Heffron²,

Mehnert³

et al. 2015

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Advanced insulation materials provide resistance to heat flow. Properly insulating shelters can reduce heating and cooling costs, as well as improves comfort. However, the long-term performance of insulation materials is relatively unknown. This research investigated the long-term performance of five commercially available insulation materials including nonwoven insulation liner, aerogel blankets, closed cell spray polyurethane foam (ccSPF), extruded polysterene (XPS), and fiberglass batt. Accelerated aging simulation experiments were conducted in an environmental chamber. All materials were subjected to 5 weeks in the chamber and exposed to various temperature and humidity conditions. Thermal conductivity using a heat flow meter apparatus (HFMA) and corresponding Rvalues of each material were calculated. The results indicate that moisture absorption was a major contributor to changes in the thermal properties of the materials. Additional degradation in R-values in ccSPF was caused by loss of blowing agent over time. The results of this research are expected to help formulate an accelerated aging methodology that allows reliable prediction of long-term advanced insulation materials performance.

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Thermal conductivities study on silica aerogel and its composite insulation materials

Cited by 407 publications

References 28 publications

Properties, applications and thermal investigation of aerogels

Properties, applications and thermal investigation of aerogels

Flexible and Transparent Silica Aerogels: An Overview

Prediction of Long Term Degradation of Insulating Materials

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