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Thermal Characterization and Effect of Deposited \(\hbox {CO}_{2}\) on a Cryogenic Insulation System Based on a Spherical Powder

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Abstract

The objective of this work is to study the effect of deposited \(\hbox {CO}_{2}\) on the solid thermal conductivity of a cryogenic insulation system. Therefore, measurements were performed using a guarded hot plate apparatus at temperatures in the range from 80 K to 290 K in combination with a bellow acting as the sample containment. The unique experimental setup and sample preparation are described in detail. Furthermore, existing thermal models which are based on a superposition of thermal transfer due to radiation and solid thermal conductivity were modified to account for the thermal effects of deposited gases and the consequently increased solid thermal conductivity for a spherical powder. Measurements showed a significant increase of the solid thermal conductivity depending on the amount of \(\hbox {CO}_{2}\) that was provided for deposition–evacuation. 2.77 Vol-‰\(\hbox {CO}_{2}\) resulted in an increase of 5.5 % in the overall solid thermal conductivity. Twice this amount (5.54 Vol-‰\(\hbox {CO}_{2}\)) and four times this amount (11.1 Vol-‰\(\hbox {CO}_{2}\)) resulted in an increase of \(8.8\,\%\) and 14.1 % in the overall solid thermal conductivity, respectively. Due to additional temperature sensors, it was possible to measure the effective thermal conductivity in different layers of the insulation material. Thus, a significant change in the innermost layer of \(75\,\%\) was measured for the solid thermal conductivity comparing the evacuated sample with the \(\hbox {CO}_{2}\)-loaded (11.1 Vol-‰\(\hbox { CO}_{2})\) sample.

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Notes

  1. State of the art technology from different sectors included icefuel® will develop a system for transport, storage and conversion of energy, that is capable of buffering fluctuating peak load and supporting balance between power generation and power demand (for more information see www.icefuel.de).

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Acknowledgments

The scientific investigations have been carried out within the research project “\(icefuel^{\textregistered }\)”. This joint research project started in July 2006 and is supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF), Federal Republic of Germany, in Bonn (FKZ 16SV2357).

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Authors and Affiliations

  1. Großkrotzenburg, Germany

    M. Geisler

  2. Functional Materials for Energy Technology, Bavarian Center For Applied Energy Research, Magdalene-Schoch-Straße 3, 97074, Würzburg, Germany

    H.-P. Ebert

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  1. M. Geisler
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  2. H.-P. Ebert
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Correspondence to M. Geisler.

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Geisler, M., Ebert, HP. Thermal Characterization and Effect of Deposited \(\hbox {CO}_{2}\) on a Cryogenic Insulation System Based on a Spherical Powder. Int J Thermophys 37, 80 (2016). https://doi.org/10.1007/s10765-016-2087-4

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  • DOI: https://doi.org/10.1007/s10765-016-2087-4

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