Abstract
The paper describes principal development directions of mathematical models of enclosing structure moisture regime. Benefits of mathematical models based on moisture potential theory are demonstrated. Moisture regime calculation by means of moisture potential, taking liquid and vapor moisture transfer into consideration, and using discrete-continual approach is proposed. New formulas for single-layer and multi-layer enclosing structures allowing for numerical analytic determination of moisture potential value in any enclosing structure section, at any moment of time, under continuous control of temperature distribution, have been derived. Moisture distribution has been studied for a number of enclosing structures using different methods of moisture potential theory: unsteady-state method, quasi-stationary method, the proposed discrete-continual method. Moisture regime has been determined for single-layer enclosing structure with ceramic brick basement and lime brick cladding in Moscow. It is shown that the greatest moisture value is achieved in enclosing structure calculation by means of steady-state method. Unsteady-state method gives more accurate moisture distribution. The proposed discrete-continual method gives quantitative and qualitative result of moisture distribution similar to results obtained by unsteady-state method. The benefit of discrete-continual method is a distribution obtained analytically, which allows to use solution results without numerical method application.
Highlights
1.1 Moisture regime and its role in constructionAssessment of enclosing structure moisture regime is one of the key directions in construction
Moisture regime of a single-layer enclosing structure has been studied by means of various methods of moisture potential theory: engineering quasistationary method, unsteady-state method, and the proposed discrete-continual method
Moisture potential distribution in engineering quasi-stationary method has been determined analytically according to equation (18)
Summary
1.1 Moisture regime and its role in construction. Assessment of enclosing structure moisture regime is one of the key directions in construction. Errors in overwetting protection design can reduce enclosing structure durability and result in premature failure of the building [1,2,3,4,5]. Moisture in enclosing structure thickness influences both on power saving properties of building thermal protective shell [6,7,8,9,10,11], and on human health [12].
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