Transient versus steady-state thermal conductivity measurements: A case study of thermal characterisation of a novel biobased insulation material

Latif, Eshrar ORCID: https://orcid.org/0000-0003-3982-6929 2023. Transient versus steady-state thermal conductivity measurements: A case study of thermal characterisation of a novel biobased insulation material. Presented at: 5th International Conference on Bio-Based Building Materials ICBBM-2023, Vienna, 21-23 June 2023.

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Abstract

Abstract. For quick measurement of the thermal conductivity of building mate rials, the transient method is favoured by researchers. However, the steady-state method is recognised as a more reliable method for measuring thermal conductivity. The current work is part of the hygrothermal characterisation of a novel biobased material for building envelope applications. The aim of this part of the research work was to assess the reliability of the transient method in determining the thermal conductivity of the novel biobased material. As such, steady-state thermal conductivity values of the materials were determined using a Fox 600 guarded hotplate. Transient thermal conductivity was determined with an Isomet 2114 Thermal Properties Analyzer. To measure transient thermal conductivity both surface probes and needle probes were used with and without the application of thermal paste between the probes and the surface of the materials. It was observed that, in comparison to a steady-state measurement, transient measurement with needle probe overestimates and with disk probe underestimates thermal conductivity by about 14%. However, the average of the values determined by needle probes and disk probes were close to the values determined by steady-state method. It was further observed that the direct application of thermal paste on the material surface resulted in an increase of thermal conductivity by 52% from the values obtained by steady-state method.

Item Type:	Conference or Workshop Item (Paper)
Status:	Unpublished
Schools:	Architecture Engineering
Uncontrolled Keywords:	Thermal conductivity, biobased materials, transient method, steady-state method.
Date of First Compliant Deposit:	28 June 2023
Date of Acceptance:	27 May 2023
Last Modified:	24 Jul 2023 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/160678

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