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Hagentoft, Carl-eric Carl-eric; Wang, Jinkai. A Numerical Method for Calculating Combined Heat, Air and Moisture Transport in Building Envelope Components. Nordic Journal Of Building Physics: Acta Physica Aedificiorum, v. 2, p. 1 -1, 2001.
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Abstract

This paper deals with a numerical strategy for obtaining a stable numerical solution of combined heat, air and moisture transport in building envelope components. Based on an analysis of the coupling characteristics between the three transport processes, a conditionally stable algorithm is presented. The algorithm combines the explicit and relaxation schemes. The former is used for heat and moisture transport, and the later for air transport. Along with the algorithm, a criterion for a determination of the time step is developed to ensure numerical stability. The calculation time step is determined in terms of the stability criteria for heat and moisture transport, and a criterion for controlling latent heat release or absorption. The paper also presents two case studies to evaluate the proposed numerical method.
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