Quasi steady state and dynamic hygrothermal performance of fibrous Hemp and Stone Wool insulations: two innovative laboratory based investigations

Latif, Eshrar ORCID: https://orcid.org/0000-0003-3982-6929, Tucker, Simon, Ciupala, Mihaela Anca, Wijeyesekera, Devapriya Chitral, Newport, Darryl John and Pruteanu, Marian 2016. Quasi steady state and dynamic hygrothermal performance of fibrous Hemp and Stone Wool insulations: two innovative laboratory based investigations. Building and Environment 95 , pp. 391-404. 10.1016/j.buildenv.2015.10.006

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Abstract

Moisture and heat management properties of Hemp and Stone Wool insulations were studied by mounting them between a hot and a cold climate chamber. Both insulations were exposed to identical hygrothermal boundary conditions. Quasi steady state and dynamic tests were carried out at a range of relative humidity exposures. The likelihood of interstitial condensation was assessed and equivalent thermal conductivity values of the insulations were determined. The adsorption–desorption isotherms of the insulations were also determined in a dynamic vapour sorption (DVS) instrument. It was observed that the likelihood of condensation was higher in Stone Wool insulation than in Hemp insulation. Hemp insulation performed better in managing moisture due to its high hygric inertia and water absorption capacity. It was observed that the equivalent thermal conductivity of Stone Wool insulation was dependent on enthalpy flow and phase change of moisture. The equivalent thermal conductivity of Hemp insulation was close to its declared thermal conductivity in dynamic conditions when high relative humidity exposures were transient. In quasi steady state boundary conditions, when the insulation was allowed to reach the equilibrium moisture content at ranges of relative humidity, there was a moisture dependent increase of thermal conductivity in Hemp insulation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Architecture
Subjects:	N Fine Arts > NA Architecture
Publisher:	Elsevier
ISSN:	0360-1323
Date of Acceptance:	10 October 2015
Last Modified:	01 Nov 2022 10:02
URI:	https://orca.cardiff.ac.uk/id/eprint/89960

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