AbstractAbout AuthorsReferences
The problems arising when determining the thermal conductivity of building materials for norm-setting and practical application are presented. It is shown that the thermal conductivity of the material in the dry state, determined in the laboratory, differs from the calculated thermal conductivity under operating conditions, the correct purpose of which is the most important task of modern standardization. The first part highlights the aspects which are not reflected in the current standard with the method for thermal conductivity measurement – GOST 7076–99, but which are often found in testing practice: measurement of thermal conductivity of gas-filled polymer materials and samples with high thickness, features of the instrument base when measuring the thermal conductivity, as well as proposals for actualizing this standard are formulated. The second part presents the criticism of the experimental method for determining the calculated thermal conductivity and concludes that the thermal conductivity under specified operating conditions can only be determined by calculation. The attempts to implement the standard-analogue of ISO 10456:2007 are described and the reasons for the impossibility of its application in the Russian Federation are shown. The methods for determining the calculated thermal conductivity based on the use of the coefficient of thermo-technical quality, which will form the basis of the developed National Standard “Heat-Insulating Materials and Products in Enclosing Structures of Buildings. Methods for Determining Thermo-Technical Indicators under Operating Conditions” are presented. The experimental method for determining the coefficients of the thermo-technical quality of building materials is developed and described.
P.P. PASTUShKOV1, 2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
1 Research Institute of Building Physics Russian Academy Architecture and Construction sciences (21, Lokomotivniy Driveway, Moscow,127238, Russian Federation)
2 Institute of Mechanics Lomonosov Moscow State University (1, Michurinsky Avenue, Moscow, 119192, Russian Federation)
1. Fokin K.F. Stroitel’naya teplotekhnika ograzhday-ushchih chastej zdanij. 5-e izd. [Construction heat engineering of the enclosing parts of buildings. 5th ed.]. Moscow: AVOK-PRESS. 2006. 252 p.
2. Gagarin V.G., Pastushkov P.P. The change in time of thermal conductivity of gas-filled polymer insulating materials. Stroitel’nye Materialy [Construction Mateials]. 2017. No. 6, pp. 28–31. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2017-749-6-28-31
3. Gagarin V.G., Pastushkov P.P. Determination of the calculated moisture content of building materials. Promyshlennoe i grazhdanskoe stroitel’stvo. 2015. No. 8, pp. 28–33. (In Russian).
4. Kiselev I.Ya. Improving the accuracy of determining the thermophysical properties of insulating building materials with regard to their structure and characteristics of operational impacts. Doctor diss. (Engineering). Moscow. 2006. 366 p. (In Russian).
5. Gagarin V.G. Theory of state and moisture transfer in building materials and heat-shielding properties of enclosing structures of buildings. Doctor diss. (Engineering). Moscow. 2000. 396 p. (In Russian).
6. Kupriyanov V.N., Yuzmuhametov A.M., Safin I.Sh. The effect of moisture on the thermal conductivity of wall materials. State of the matter. Izvestiya Kazanskogo gosudarstvennogo arhitekturno-stroitel’nogo universiteta. 2017. No. 1 (39), pp. 102–110. (In Russian).
7. Kunzel H. Aerated concrete. Heat and moisture behavior. Wiesbaden. Berlin: Bauverlag. 1970. 120 p.
8. Pastushkov P.P. The influence of the moisture regime of enclosing structures with external plaster layers on the energy efficiency of thermal insulation materials. Cand. diss. (Engineering). Moscow. 2013. 169 p. (In Russian).
9. Pastushkov P.P., Gagarin V.G. Studies of the dependence of thermal conductivity and the coefficient of thermal quality on the density of autoclaved aerated concrete. Stroitel’nye Materialy [Construction Materials]. 2017. No. 5, pp. 26–28. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2017-748-5-26-28
10. Kiselyov I.YA. Features of heat transfer through mineral wool products. Academia. Arhitektura i stroitel’stvo. 2017. No. 2, pp. 103–105. (In Russian).
2. Gagarin V.G., Pastushkov P.P. The change in time of thermal conductivity of gas-filled polymer insulating materials. Stroitel’nye Materialy [Construction Mateials]. 2017. No. 6, pp. 28–31. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2017-749-6-28-31
3. Gagarin V.G., Pastushkov P.P. Determination of the calculated moisture content of building materials. Promyshlennoe i grazhdanskoe stroitel’stvo. 2015. No. 8, pp. 28–33. (In Russian).
4. Kiselev I.Ya. Improving the accuracy of determining the thermophysical properties of insulating building materials with regard to their structure and characteristics of operational impacts. Doctor diss. (Engineering). Moscow. 2006. 366 p. (In Russian).
5. Gagarin V.G. Theory of state and moisture transfer in building materials and heat-shielding properties of enclosing structures of buildings. Doctor diss. (Engineering). Moscow. 2000. 396 p. (In Russian).
6. Kupriyanov V.N., Yuzmuhametov A.M., Safin I.Sh. The effect of moisture on the thermal conductivity of wall materials. State of the matter. Izvestiya Kazanskogo gosudarstvennogo arhitekturno-stroitel’nogo universiteta. 2017. No. 1 (39), pp. 102–110. (In Russian).
7. Kunzel H. Aerated concrete. Heat and moisture behavior. Wiesbaden. Berlin: Bauverlag. 1970. 120 p.
8. Pastushkov P.P. The influence of the moisture regime of enclosing structures with external plaster layers on the energy efficiency of thermal insulation materials. Cand. diss. (Engineering). Moscow. 2013. 169 p. (In Russian).
9. Pastushkov P.P., Gagarin V.G. Studies of the dependence of thermal conductivity and the coefficient of thermal quality on the density of autoclaved aerated concrete. Stroitel’nye Materialy [Construction Materials]. 2017. No. 5, pp. 26–28. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2017-748-5-26-28
10. Kiselyov I.YA. Features of heat transfer through mineral wool products. Academia. Arhitektura i stroitel’stvo. 2017. No. 2, pp. 103–105. (In Russian).
For citation: Pastushkov P.P. On the problems of determining the thermal conductivity of building materials. Stroitel’nye Materialy [Construction Materials]. 2019. No. 4, pp. 57–63. DOI: https://doi.org/10.31659/0585-430X-2019-769-4-57-63 (In Russian).