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Abstract

The multilayer flexible composite (MFC) materials are extensively used in space environment, polar environment, volcano adventure, and so on as light weight insulation protection systems between room (20 ± 2°C) and high (150 ± 5°C)-low (-110 ± 5°C) operating temperature. A new concept for high-low temperature resistance arrangement is presented in this article considering heat load contributions. The main advantages of this concept consist of the structure of the materials and the choice of spacers. The structure of the MFC material consists of outer fabric, inner fabric, and a number of thin shields separated by spacers. The thermal properties of multilayer reflecting shields with different thickness of reflecting shields, different layers, different combination structures, different spacers, and different contact states were discussed in this article. The reflecting shield (6 µm polyester film + 0.03 µm aluminum film + 8 µm polyester film) is the most ideal, and polyester mesh (down added into the mesh) is the most effective spacer with thermal insulation close to the ideal condition. Finally the thin shields and spacers are chosen, and then the optimal structure of the MFC materials is obtained with respect to insulation thickness and flexibility of the material.

Keywords

high-low temperature multilayer insulation heat transfer optimal structure.

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References

Al-Ajlan, S.A. (2006). Measurements of Thermal Properties of Insulation Materials by using Transient Plane Source Technique , Applied Thermal Engineering, 26: 2184-2191.

Neumann, H. ( 2004). Concept for Thermal Insulation Arrangement within a Flexible Cryostat for HTS Power Cables, Cryogenics, 44: 93-99.

Krishnaprakas, C.K. , Badari, N.K. and Pradip, D. (2000). Heat Transfer for Multilayer Insulation Systems, Cryogenics, 40: 431-435.

Reiss, H. ( 2004). A Coupled Numerical Analysis of Shield Temperatures, Heat Losses and Residual Gas Pressures in an Evacuated Super-Insulation using Thermal and Fluid Networks. Part I: Stationary Conditions, Cryogenics, 44: 259-271.

Ohmori, T. ( 2006). Thermal Performance of Multilayer Insulation Around a Horizontal Cylinder, Cryogenics, 45: 725-732.

Spinnler, M. , Winter, E. and Viskanta, R. ( 2004). Studies on High-Temperature Multilayer Thermal Insulations , Heat and Mass Transfer, 47: 1305-1312.

Spinnler, M. , Winter, E. , Viskanta, R. and Sattelmayer, T. ( 2004). Theoretical Studies of High-Temperature Multilayer Thermal Insulations using Radiation Scaling, Journal of Quantitative Spectroscopy and Radiative Transfer, 84: 477-491.

Krishnaprakas, C.K. , Badari, N.K. and Pradip, D. (2001). Combined Conduction and Radiation Heat Transfer in a Gray Anisotropically Scattering Medium with Diffuse-Pecular Boundaries, Heat and Mass Transfer, 28(1): 77-86.

Krishnaprakas, C.K. (1998). Radiation Heat Transfer in a Participating Medium Bounded by Specular Reflectors, Heat and Mass Transfer, 25(8): 1181-1188.

10.

Paulo, A.A. , Teresa, C. , Pedro, A. and Domingos, B. ( 2006). Optimization of Refrigerated Shields using Multilayer Thermal Insulation, Cryostates Design - Analytical Solution, Cryogenics, 46(1): 449-457.

11.

Chen, J.J. and Yu, W.D. ( 2008). Structure Designing and Properties Investigation of Flexible Multilayer Thermal Insulation Materials, In: 86th Textile Institute World Conference Proceedings, Hong Kong , 18-21 November, pp. 1456-1464.

Concept for High-Low Temperature Resistance Arrangement within Multilayer Flexible Composite Materials

Abstract

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