Analytical model of heat transfer in porous insulation around cold pipes

Tom Guldbrandsen; Per W. Karlsson; Vagn Korsgaard

doi:10.1016/j.ijhearmasstransfer.2010.09.044

Analytical model of heat transfer in porous insulation around cold pipes

Tom Guldbrandsen, Per W. Karlsson, Vagn Korsgaard

Research output: Contribution to journal › Journal article › Research › peer-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 language	English
Journal	International Journal of Heat and Mass Transfer
Volume	54
Issue number	1-3
Pages (from-to)	288-292
ISSN	0017-9310
DOIs	https://doi.org/10.1016/j.ijhearmasstransfer.2010.09.044
Publication status	Published - 2011

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title = "Analytical model of heat transfer in porous insulation around cold pipes",

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.",

author = "Tom Guldbrandsen and Karlsson, {Per W.} and Vagn Korsgaard",

year = "2011",

doi = "10.1016/j.ijhearmasstransfer.2010.09.044",

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issn = "0017-9310",

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AU - Guldbrandsen, Tom

AU - Karlsson, Per W.

AU - Korsgaard, Vagn

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

U2 - 10.1016/j.ijhearmasstransfer.2010.09.044

DO - 10.1016/j.ijhearmasstransfer.2010.09.044

M3 - Journal article

SN - 0017-9310

VL - 54

SP - 288

EP - 292

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

IS - 1-3

ER -

Analytical model of heat transfer in porous insulation around cold pipes

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