Abstract
Several methods are presented for analyzing the hygrothermal behavior of building structures. Requirements for a numerical method depend on the structure, its boundary conditions and the accuracy requirements. The commonly used dew-point test is simple, but it is not valid in cases with unsteady boundary conditions and hygroscopic materials. Numerical dynamic simulation models are more suitable for use in analyzing the hygrothermal performance of wall structures. In this study numerical simulation models for analyzing 1- and 2- dimensional, unsteady heat and moisture transfer in building structures are presented. The numerical models MOIST, TCCC2D and TRATMO2 presented in this study, are found to meet relatively well the requirements for numerical analysis of moisture transfer. However, thermal effects of phase changes, the nonhygroscopic absorption of condensed water on material boundaries and the nonidealities of the structure have not yet been modelled. This study also presents a summary of the results of the work of a committee on methods of predicting moisture conditions in
| Translated title of the contribution | Moisture transfer in building structures. Numerical methods |
|---|---|
| Original language | Finnish |
| Title of host publication | Valtion Teknillinen Tutkimuskeskus, Tutkimuksia |
| Edition | 595 |
| State | Published - 1989 |
| Externally published | Yes |