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Erschienen in:

2017 | OriginalPaper | Buchkapitel

20. Thermal Insulation and Porosity—From Macro- to Nanoscale

verfasst von : Dana Křemenáková, Jiří Militký, Mohanapriya Venkataraman, Rajesh Mishra

Erschienen in: Thermal Physics and Thermal Analysis

Verlag: Springer International Publishing

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Abstract

Porosity of textiles is one of the main factors influencing their thermal conductivity and insulation. Porosity in textile fabrics is the combination of fiber porosity, yarn packing density, and voids due to fabric construction. It is shown that assemblies from very fine fibers tend to suppress radiation and convection heat transfers because of huge total surface area, which restricts the free flow of air passing through them. For effective thermal insulation especially at low temperatures, it should be selected sufficiently high thickness of textile layer as well. Porosity is therefore decisive parameter for the evaluation of thermal comfort expressed in special units “clo.” The main aim of this chapter is the prediction of the effect of porosity of fabrics and fibers on the thermal conductivity and insulation. The changes of thermal comfort due to the use of hollow fibers and multilayer corrugated nonwovens are described. The thermal properties of highly porous aerogel structures are discussed. Enhancement of insulation by their inclusion into textiles is investigated as well.

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Vorheriges Kapitel Physico-chemical Analysis of Ceramic Material Systems: From Macro- to Nanostate

Nächstes Kapitel Biomaterials and Nanotechnology Approach to Medical Enhancement

Krokida MK, Maroulis ZB (1997) Effect of drying method on shrinkage and porosity. Drying Technol 15:2441–2458CrossRef

Datta AK (2007) Porous media approaches to studying simultaneous heat and mass transfer in food processes. I. Problem formulations. J Food Eng 80:80–95CrossRef

Farnworth B (1983) Mechanisms of heat flow through clothing insulation. Text Res J 53:717–725CrossRef

Venkataraman M, Mishra R, Kotresh T M, Militky J and Jamshaid H (2016) Aerogel for thermal insulation in high-performance textiles, Text Prog 48(2):55–118

Pl Gagge A et al (1941) A practical system of units for the description of heat exchange of man with his environment. Science 94:428–430CrossRef

Petrulis D (2004) Fundamental study of the effect of the fiber wall thickness on the structure of polyamide and polypropylene hollow fibers. J Appl Polym Sci 92:2017–2022CrossRef

Lu X, Caps R, Fricke J et al (1995) Correlation between structure and thermal-conductivity of organic aerogels. J Non-Cryst Solids 188:226–234CrossRef

Fricke J, Tillotson T (1997) Aerogels: Production, characterization and applications. Thin Solid Films 297:212–223CrossRef

Woignier T, Phalippou J (1987) Skeletal density of silica aerogels. J Non-Cryst Solids 93:17–21CrossRef

10.

Lu X, Arduinischuster MC, Kuhn J et al (1992) Thermal-conductivity of monolithic organic aerogels. Science 255:971–972CrossRef

11.

Wei GS, Liu YS, Zhang XX et al (2011) Thermal conductivities study on silica aerogel and its composite insulation materials. Int J Heat Mass Transf 54:2355–2366CrossRef

12.

Fu B, Luo H, Wang F et al (2011) Simulation of the microstructural evolution of a polymer crosslinked templated silica aerogel. J Non-Cryst Solids 357:2063–2074CrossRef

13.

Xiao X, Streiter R, Ruan G et al (2000) Modelling and simulation for dielectric constant of aerogel. Microelectron Eng 54:295–301CrossRef

14.

Chen ZQ, Cheng P, Hsu CTA (2000) Theoretical and experimental study on stagnant thermal conductivity of porous media. Int Commun Heat Mass 27:601–610CrossRef

15.

Fei H, Hao X, Li Y (2005) Study on thermal properties of aerogels. Mater Rev 19:20–22

16.

Li SY, Chu HS, Yan WM (2008) Numerical study of phonon radiative transfer in porous nanostructures. Int J Heat Mass Transf 51:3924–3931CrossRef

17.

Lee OJ, Lee KH, Yim TJ et al (2002) Determination of mesopore size of aerogels from thermal conductivity measurements. J Non-Cryst Solids 298:287–292CrossRef

18.

Liu H, Li Y, Zhao X, Tao W (2015) Study on unit cell models and the effective thermal conductivities of silica aerogel. J Nanosci Nanotechno 15(4):3218–3223

19.

Zeng SQ, Hunt A, Greif R (1995) Mean free-path and apparent thermal-conductivity of a gas in a porous-medium. J Heat Trans-Transf ASME 117:758–761CrossRef

20.

Zeng SQ, Hunt A, Greif R (1995) Transport-properties of gas in silica aerogel. J Non-Cryst Solids 186:264–270CrossRef

21.

Hrubesh LW, Pekala RW (1994) Thermal-properties of organic and inorganic aerogels. J Mater Res 9:731–738CrossRef

22.

Gross J, Fricke J, Pekala RW et al (1992) Elastic nonlinearity of aerogels. Phys Rev B45:12774–12777CrossRef

23.

Wang J, Kuhn J, Lu X (1995) Monolithic silica aerogel insulation doped with TiO₂ powder and ceramic fibers. J Non-Cryst Solids 186:296–300CrossRef

24.

Swimm K, Reichenauer G, Vidi S et al (2009) Gas pressure dependence of the heat transport in porous solids. Int J Thermophys 30:1329–1342CrossRef

25.

Hemberger F, Weis S, Reichenauer G et al (2009) Thermal transport properties of functionally graded carbon aerogels. Int J Thermophys 30:1357–1371CrossRef

26.

Zhao JJ, Duan YY, Wang XD et al (2012) A 3-D numerical heat transfer model for silica aerogels based on the aggregate structure. J Non-Cryst Solids 358:1287–1297CrossRef

27.

Zeng JS, Greif QR, Stevens P (1996) et al. Effective optical constants n and k and extinction coefficient of silica aerogel. J Mater Res 11:687–693CrossRef

28.

Deng ZS, Wang J, Wu AM et al (1998) High strength SiO₂ aerogel insulation. J Non-Cryst Solids 225:101–104CrossRef

29.

Lee SC, Cunnington GR (2000) Conduction and radiation heat transfer in high-porosity fiber thermal insulation. J Thermophys Heat Transf 14:121–136CrossRef

30.

Cunnington GR, Lee SC (1996) Radiative properties of fibrous insulations: theory versus experiment. J Thermophys Heat Transf 10:460–466CrossRef

31.

Rozek Z et al (2008) Potential applications of nanofiber textile covered by carbon coatings. J Achievements Mater Manufacturing Eng 27:35–38

32.

Li Y, Holcombe BV (1998) Mathematical simulation of heat and moisture transfer in a human-clothing-environment system. Text Res J 68:389–397

33.

Fohr JP, Treguier G (2002) Dynamic heat and water transfer through layered fabrics. Text Res J 72:1–12CrossRef

34.

Sukigara SHY, Fujimoto T (2003) Compression and thermal properties of recycled fiber assemblies. Text Res J 73:310–315CrossRef

35.

Reim M et al (2005) Silica aerogel granulate material for thermal insulation and daylighting. Sol Energy 79:131–139CrossRef

36.

Venkataraman M, Mishra R, Jasikova D, Kotresh TM, Militky J. Thermodynamics of aerogel treated nonwoven fabrics at subzero temperatures. J Ind Text (in print)

37.

Warrier P, Yuan YH, Beck MP et al (2010) Heat transfer in nanoparticle suspensions: modeling the thermal conductivity of nanofluids. AIChE J 56:3243–3256CrossRef

Titel: Thermal Insulation and Porosity—From Macro- to Nanoscale
verfasst von: Dana Křemenáková
Jiří Militký
Mohanapriya Venkataraman
Rajesh Mishra
Verlag: Springer International Publishing
Buch: Thermal Physics and Thermal Analysis
Print ISBN: 978-3-319-45897-7

Electronic ISBN: 978-3-319-45899-1

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-3-319-45899-1_20

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