Temperature dependency of the thermal conductivity of porous heat storage media

Hailemariam, Henok and Wuttke, Frank (2017) Temperature dependency of the thermal conductivity of porous heat storage media Heat and Mass Transfer . pp. 1-21. DOI 10.1007/s00231-017-2204-3.

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Abstract

Analyzing the variation of thermal conductivity with temperature is vital in the design and assessment of the efficiency of sensible heat storage systems. In this study, the temperature variation of the thermal conductivity of a commercial cement-based porous heat storage material named – Füllbinder L is analyzed in saturated condition in the temperature range between 20 to 70°C (water based storage) with a steady state thermal conductivity and diffusivity meter. A considerable decrease in the thermal conductivity of the saturated sensible heat storage material upon increase in temperature is obtained, resulting in a significant loss of system efficiency and slower loading/un-loading rates, which when unaccounted for can lead to the under-designing of such systems. Furthermore, a new empirical prediction model for the estimation of thermal conductivity of cement-based porous sensible heat storage materials and naturally occurring crystalline rock formations as a function of temperature is proposed. The results of the model prediction are compared with the experimental results with satisfactory results.

Document Type: Article
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1007/s00231-017-2204-3
ISSN: 0947-7411
Date Deposited: 08 Jan 2018 11:59
Last Modified: 08 Jan 2018 11:59
URI: http://eprints.uni-kiel.de/id/eprint/41264

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