Analytical model of heat transfer in porous insulation around cold pipes

Tom Guldbrandsen, Per W. Karlsson, Vagn Korsgaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A thermal insulation system is analysed that consists of a cold tube insulated with a porous material faced with a vapour retarding foil.Water vapour will diffuse through the vapour retarding foil and condense on the cold tube. To avoid build-up of water in the insulation a hydrophilic wicking cloth is wrapped around the cold tube and extended through a slit in the tubular insulation and a slot in the facing to the ambient so that condensed water can evaporate into the air. Some of the moisture in that part of the wicking cloth situated in the slit in the tubular insulation will diffuse backwards to the cold pipe and contribute to the heat uptake of the cold tube. This part is calculated for the stationary case and compared with the sensible heat transfer through the tubular shaped insulation material, using measured dry λ values and measured fictitious moist λ values.
Original languageEnglish
JournalInternational Journal of Heat and Mass Transfer
Volume54
Issue number1-3
Pages (from-to)288-292
ISSN0017-9310
DOIs
Publication statusPublished - 2011

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