Comparison of the Position of the Maximum Humidification Zone when Using the Methods of Stationary and Non-Stationary Heat and Humidity Regime

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Abstract

The basic formulas for mathematical modeling of the heat and moisture regime of building envelopes in stationary and non-stationary settings are given. It is noted that the mathematical model uses third kind boundary conditions. Objective of the study: to check whether the moisture maximum plane position in the thickness of building envelopes is confirmed assessing non-stationary moisture conditions. Two methods for verification are used: the graphical method for determining the plane of maximum moisture and the method for assessing the non-stationary moisture regime, based on the Gagarin and Kozlov moisture potential. It was found that the maximum moisture is confirmed both for facade systems with mineral wool insulation and for facade systems with expanded polystyrene insulation. In the case of mineral wool, the maximum moisture is located outside the insulation layer. For expanded polystyrene insulation, the maximum moisture is determined inside the insulation layer. Thus, it was confirmed that the maximum moisture in the thickness of the enclosing structure, determined by the graphical method, is confirmed by mathematical modeling of a non-stationary heat and moisture regime.

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About the authors

K. P. Zubarev

National Research Moscow State University of Civil Engineering; Scientific-Research Institute of Building Physics of RAACS; RUDN University

Author for correspondence.
Email: zubarevkirill93@mail.ru

Candidate of Sciences (Engineering)

Russian Federation, 26, Yaroslavskoe Highway, Moscow, 129337; 21, Lokomotivniy Driveway, Moscow, 127238; 6, Miklouho-Maclaya Street, Moscow, 117198

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Supplementary files

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2. Fig. 1. Applying temperature to a layer of building fencing material

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3. Fig. 2. A variant of the temperature intersection corresponding to the position of the plane of maximum moisture inside the layer

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4. Fig. 3. A variant of the relative arrangement of temperatures corresponding to the position of the plane of maximum moisture at the boundaries of the layers

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5. Fig. 4. A variant of the relative location of the temperature corresponding to the position of the maximum humidification plane on the outer surface of the structure

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6. Fig. 5. Discretization of the space-time domain

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7. Fig. 6. Determination of the position of the maximum humidification zone in a facade system with mineral wool insulation using a graphical method

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8. Fig. 7. Determination of the position of the maximum humidification zone in a facade system with expanded polystyrene insulation using a graphical method

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9. Fig. 8. Determination of the position of the maximum humidification zone in a facade system with mineral wool insulation using the method of assessing the non-stationary humidity regime

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10. Fig. 9. Determination of the position of the maximum humidification zone in a facade system with expanded polystyrene insulation using the method of assessing the non-stationary humidity regime

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