Effect of aerogel spacers on the heat transfer resistance and thermal insulation performance of multilayer super insulators

ABSTRACT

Performance of multilayer thermal insulators (MLIs) are depends on spacers density and number of reflector layers. In optimum density, aerogel spacer has the lowest thermal conduction. In the other hand, optimum layers density of MLI depend on temperature situation, which the minimum heat flux is flow through the thickness. In this work, aerogel spacer with density of 76 kg/m³ and MLI layer density of 25 layer/cm (number of layers per one centimeter of thickness) were designed as adequate insulators. Therefore, a novel class of MLI system with thermal conductivity of 5.43 × 10⁻⁴ W/m.K was evaluated as a high performance thermal insulator.

KEYWORDS:

• Multilayer super insulator
• polymeric aerogels
• nano-structure spacer
• reflector layers

Nomenclature

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Acknowledgments

The authors would like to thank Tarbiat Modares University and Iran National Science Foundation: INSF for the financial supports during this research.