Analysis of the radiative thermal transfer in planar multi-layer systems with various emissivity and transmissivity properties

TL;DR

This paper investigates radiative heat transfer in multi-layer systems, specifically in cryostats, proposing methods to reduce it using semi-transparent walls, supported by analytical and numerical analysis.

Contribution

It introduces a new analytical and numerical approach to reduce radiative transfer in multi-layer cryostat systems using semi-transparent walls.

Findings

Semi-transparent walls can significantly lower radiative heat transfer.

Numerical results demonstrate the effectiveness of the proposed method.

Analytical models support the numerical findings.

Abstract

The paper analyzes the radiative thermal transfer in a liquid helium cryostat with liquid nitrogen shielding. A infinite plane walls model is used for demonstrating a method for lowering the radiative heat transfer and the numerical results for two such systems are presented. Some advantages concerning the opportunity of using semi-transparent walls are analytically and numerically demonstrated.