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Heat Transport in Evacuated Perlite Powders for Super-Insulated Long-Term Storages up to 300 °C
Abstract
Vacuum super insulation (VSI) with expanded perlite powder is commonly used at cryogenic temperatures, but principally can also be adapted to applications at higher temperatures, such as the long-term storage of hot water in solar thermal systems. Due to the lack of experimental data in the respective temperature range, especially without external load, thermal conductivity measurements have been performed with commercial perlite powder up to 150°C mean sample temperature, corresponding to storage temperatures of around 300°C. Two different experimental geometries have been used: a guarded hot plate (GHP) setup and a cut-off concentric cylinder (CCC) apparatus. Furthermore, the radiative heat transport has been determined separately by extinction measurements using Fourier transform infrared (FTIR) spectroscopy. In addition to the laboratory experiments, a real-size prototype of a solar VSI-storage tank with 16.4 m3 water storage volume has been constructed, and the effective thermal conductivity of the perlite insulation has been determined from a heat loss measurement. The heat transport in evacuated perlite has also been treated theoretically using common models and approaches for gas heat conduction, solid-body conduction and heat transfer by thermal radiation. For the coupling between solid-body and gas conduction which occurs in the intergranular spaces of a powder material, a simple model has been developed. The total effective thermal conductivity λeff of a vacuum sup…
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“It can be seen from this figure that the high-pressure asymptotic value of conductivity is higher for the gases with lower molecular weight, while the transition pressure is approximately same for all the three gases.”
From Effective thermal conductivity of insulation materials for cryogenic LH2 storage tanks: A review (2023) · cites this paper as [12]
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Fourier Transform Infrared Spectrometry
Griffiths, P. R., & de Haseth, J. A. (2007) · doi:10.1002/047010631x · Cited by 3,052
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Cited by
Sorted by citations
Effective thermal conductivity of insulation materials for cryogenic LH2 storage tanks: A review
Ratnakar, R. R., Sun, Z., & Balakotaiah, V. (2023) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2022.11.130 · Cited by 73
Metadata
- Authors
- Beikircher, T., & Demharter, M.
- Affiliations
- e-mail:
- Bavarian Center for Applied Energy Research (DE)
- Venue
- Journal of Heat Transfer
- Publisher
- Wiley
- Published
- 2013-04-11
- Volume
- 135
- Issue
- 5
- ISSN
- 0022-1481 (ISSN-L)
- 1528-8943
- OpenAlex
- W1994115022
- Cited by
- 31
- References
- 1
- Citations by year
- 2025: 3 · 2024: 5 · 2023: 5 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 1
- FWCI
- 1.32
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ASME Journal of Heat and Mass Transfer (publishedVersion)
- Funders
- Ministry of Environment
- Bundesministerium für Umwelt, Naturschutz, nukleare Sicherheit und Verbraucherschutz
- Topics
- Physical Sciences › Engineering › Computational Mechanics › Heat and Mass Transfer in Porous Media
- Physical Sciences › Engineering › Mechanical Engineering › Phase Change Materials Research
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Solar Thermal and Photovoltaic Systems
- Keywords
- thermal conductivity, solar thermal energy storage, radiative transfer, effective thermal conductivity, heat loss measurement, guarded hot plate, insulation density, high-temperature insulation, heat transfer modeling
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- Beikircher, T., & Demharter, M. (2013). Heat Transport in Evacuated Perlite Powders for Super-Insulated Long-Term Storages up to 300 °C. Journal of Heat Transfer. https://doi.org/10.1115/1.4023351
