AbstractAbout AuthorsReferences
Thermal-physical properties and durability of enveloping structures are interconnected with their temperature-moisture conditions of operation and the humidity of materials used. The vaporous moisture passing through the enclosing structure can humidify its material layers due to the processes of sorption and condensation. Engineering methods for calculation of the humidity conditions use the constant coefficient of vapor permeability, but numerous studies show its significant dependence on the humidity of materials. Taking into consideration that in the cross-section of the enclosing structure, a gradient of relative air humidity exists, it is possible to assume that the values of vapor permeability of material layers will not be permanent and they must be taken into account when forecasting the moisture condition. The conducted study proves the need for accounting of variable values of the vapor permeability coefficient at the stage of designing external enveloping structures. It is shown that the accounting of the variable value of vapor permeability significantly influences on the quantitative assessment of the humidity condition of the structure, for the period of moisture accumulation and calculated quantity of moisture passing through the structure particularly.
V.N. KUPRIYANOV, Doctor of Sciences (Engineering), Corresponding member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.S. PETROV, Engineer-architect (This email address is being protected from spambots. You need JavaScript enabled to view it.)
A.S. PETROV, Engineer-architect (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)
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2. Galbraith G.H., McLean R.C., Guo J.S. Moisture permeability data presented as a mathematical function applicable to heat and moisture transport models. BS’97. 1997. Vol. 1.
3. Jepshtejn A.S. Mekhanizm dvizheniya vlagi v nekotorykh stroitel’nykh materialakh pri perepade temperatur [The mechanism of moisture movement in some building materials at difference of temperatures]. Kiev: Izdat. Akademii arhitektury Ukrainskoj SSR, 1953. 16 p.
4. Vajcekauskas V.S. Waterpermeability of sorption-moist capillary-porous building materials research. Cand. Diss. (Engineering). Kaunas. 1975. (In Russian).
5. Monstvilas Je.Je. Improving calculating of fence moisture condition at unsteady conditions of moisture transfer. Cand. Diss. (Engineering). Moscow. 1982. 232 p. (In Russian).
6. Patent RF useful model patent 128718. Ustroistvo dlya izmereniya paropronitsaemosti stroitel’nykh materialov [Water vapor transmission rate test system]. Kupriyanov V.N., Petrov A.S. Declared 2012155972/28, 21.12.2012. Published 27.05.2013. (In Russian).
7. Petrov A.S., Kupriyanov V.N. Influence of temperature and humidity conditions for the operation of construction materials on their vapor permeability. Izvestiya KGASU. 2015. No. 1 (31), pp. 92–98. (In Russian)
. 8. Kupriyanov V.N., Safin I.Sh. Quantitative parameters of vapor condensation in exterior walls. Izvestiya KGASU. 2013. No. 4 (26), pp. 121–128. (In Russian).
9. Kupriyanov V.N., Ivantsov A.I. Condensation of water vapor in the external walls with daily fluctuations of the outside temperature. Privolzhskiy nauchnyy zhurnal. 2013. No. 2, pp. 17–22. (In Russian).
10. Ivantsov A.I., Kupriyanov V.N. Operating mode of multilayer wall enclosing structures as a basis for predicting their life. Izvestiya KGASU. 2014. No. 3 (29), pp. 32–40. (In Russian).
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