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1

An analysis of relations for determining the thermal conductivity of rigid polymer foam

Alsabry A., Nikitsin V. I., Kofanov V. A., Backiel-Brzozowska B.

International Journal of Applied Mechanics and Engineering

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2018

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Vol. 23, no. 4

1015--1023

EN

In the paper the authors present the effectiveness of the generalized thermal conductivity method for polymer foams, including modelling their geometrical structure. Calculations of the effective thermal conductivity coefficient λ are based on the generally accepted assumption of the additivity of different thermal exchange mechanisms in porous media and this coefficient is presented as a sum the coefficients of conductive λq, radiative λp, and convective λk thermal conductivity. However, in literature not enough attention is given to relations determined by means of the theory of generalized conductivity, including modelling the geometrical structure. This paper presents an analysis of these relations and verifies their ability to predict experimental data in comparison with the best formulae included in the paper [2].

2

Evaluation of the influence of wind-driven rain on moisture in cellular concrete wall boards

Alsabry A., Nikitsin V. I., Kofanov V. A., Backiel-Brzozowska B.

International Journal of Applied Mechanics and Engineering

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2017

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Vol. 22, no. 3

509--519

EN

The non-stationary moisture level of a cellular concrete wall board in a heated utility building located in the northern part of the town of Brest (Belarus), depending on the climatic influence, was assessed in this work. The results were obtained both in a calculation experiment and a physical test. It was observed that the main reason for the high moisture levels in cellular concrete is wind-driven rain intensifying the process of free capillary moisture transfer. A comparative analysis of the results of the physical test and the calculation experiment showed that the THSS software elaborated by the authors was able to predict the actual moisture levels of the shielding structure under study accurately enough when precise data concerning the thermal and physical characteristics of the materials as well as the occurring climatic influences were submitted.

3

Ocena wpływu zacinającego deszczu na zawilgocenie płyty ściennej z betonu komórkowego

Nikitsin V. I., Kofanov V. A., Backiel-Brzozowska B.

Budownictwo i Inżynieria Środowiska

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2016

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Vol. 7, no. 2

99--103

PL

Zbadano niestacjonarny stan zawilgocenia betonu komórkowego płyty ściennej ogrzewanego budynku gospodarczego od oddziaływań klimatycznych za pomocą eksperymentu obliczeniowego i fizycznego. Obliczenie wykonano z zastosowaniem programu komputerowego TWiND i ustalono, że wśród rozpatrywanych oddziaływań klimatycznych główną przyczyną wysokiego poziomu wilgotności betonu komórkowego jest zacinający deszcz, który intensyfikuje proces swobodnego kapilarnego transportu wilgoci. Analiza porównawcza wyników eksperymentu fizycznego i obliczeniowego pokazała, że program TWiND, po dokładnym zadaniu wartości parametrów cieplnofizycznych materiałów i uwzględnieniu oddziaływań klimatycznych, umożliwił wystarczająco dokładną prognozę rzeczywistego zawilgocenia rozpatrywanej osłony.

EN

The non-stationary moisture level of a cellular concrete wall board in a heated utility building located in the northern part of the town of Brest (Belarus), depending on climatic influence, was assessed in this work. The results were obtained both in a calculation experiment and a physical test. The calculation experiment was performed using TWiND computer application elaborated by the authors. It was observed that wind-driven rain intensifying the process of free capillary moisture transfer is the main reason for the high moisture levels in cellular concrete. A comparative analysis of the results of the physical test and the calculation experiment showed that the THSS application elaborated by the authors enabled to predict the actual moisture levels of the shielding structure under study accurately enough when precise data concerning the thermal and physical characteristics of the materials as well as the occurring climatic influences had been submitted.