Transient analysis of the thermal and moisture physical behaviour of building constructions

Reijo Kohonen, Jukka Määttä

Research output: Book/ReportReportProfessional

Abstract

Constitutive equations for simultaneous heat and mass transfer in porous material are derived from the integrated mass, momentum and energy balance equations using the averaging divergence theorem. The temperature and moisture content are used as independent variables. In the energy balance equation the conduction, convection and accumulation of heat and heat source due to phase changes are considered. In the moisture balance equation the accumulation of moisture, the diffusion flow of water vapour, the capillary flow of liquid water and the viscous flow of humid air and water are considered. The boundary layer and interracial balance equations are derived. For transient analysis of the moisture physical behaviour of multilayer constructions a numerical algorithm and a computer program based on the Crank - Nicholson method and quasi linearization is formulated. Some example calculations are presented to illustrate the computer program. The accuracy of the numerical algorithm compared with the analytical solution for a semi-infinite body is presented.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages78
ISBN (Print)951-38-1700-8
Publication statusPublished - 1983
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume168

Fingerprint

building construction
moisture
energy balance
software
constitutive equation
viscous flow
heat source
heat transfer
mass transfer
moisture content
momentum
water vapor
boundary layer
divergence
convection
water
liquid
analysis
air
temperature

Cite this

Kohonen, R., & Määttä, J. (1983). Transient analysis of the thermal and moisture physical behaviour of building constructions. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 168
Kohonen, Reijo ; Määttä, Jukka. / Transient analysis of the thermal and moisture physical behaviour of building constructions. Espoo : VTT Technical Research Centre of Finland, 1983. 78 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 168).
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Kohonen, R & Määttä, J 1983, Transient analysis of the thermal and moisture physical behaviour of building constructions. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 168, VTT Technical Research Centre of Finland, Espoo.

Transient analysis of the thermal and moisture physical behaviour of building constructions. / Kohonen, Reijo; Määttä, Jukka.

Espoo : VTT Technical Research Centre of Finland, 1983. 78 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 168).

Research output: Book/ReportReportProfessional

TY - BOOK

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AU - Määttä, Jukka

PY - 1983

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N2 - Constitutive equations for simultaneous heat and mass transfer in porous material are derived from the integrated mass, momentum and energy balance equations using the averaging divergence theorem. The temperature and moisture content are used as independent variables. In the energy balance equation the conduction, convection and accumulation of heat and heat source due to phase changes are considered. In the moisture balance equation the accumulation of moisture, the diffusion flow of water vapour, the capillary flow of liquid water and the viscous flow of humid air and water are considered. The boundary layer and interracial balance equations are derived. For transient analysis of the moisture physical behaviour of multilayer constructions a numerical algorithm and a computer program based on the Crank - Nicholson method and quasi linearization is formulated. Some example calculations are presented to illustrate the computer program. The accuracy of the numerical algorithm compared with the analytical solution for a semi-infinite body is presented.

AB - Constitutive equations for simultaneous heat and mass transfer in porous material are derived from the integrated mass, momentum and energy balance equations using the averaging divergence theorem. The temperature and moisture content are used as independent variables. In the energy balance equation the conduction, convection and accumulation of heat and heat source due to phase changes are considered. In the moisture balance equation the accumulation of moisture, the diffusion flow of water vapour, the capillary flow of liquid water and the viscous flow of humid air and water are considered. The boundary layer and interracial balance equations are derived. For transient analysis of the moisture physical behaviour of multilayer constructions a numerical algorithm and a computer program based on the Crank - Nicholson method and quasi linearization is formulated. Some example calculations are presented to illustrate the computer program. The accuracy of the numerical algorithm compared with the analytical solution for a semi-infinite body is presented.

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ER -

Kohonen R, Määttä J. Transient analysis of the thermal and moisture physical behaviour of building constructions. Espoo: VTT Technical Research Centre of Finland, 1983. 78 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 168).