AbstractAbout AuthorsReferences
The change in the thermal conductivity of gas-filled polymer insulating materials, including polyisocyanurate foam due to the replacement of gas in the pores of the material with air, is considered. The mathematical model of process is created, the equation describing the change of heat conductivity of material including two parameters is received. Experiments on measurement of heat conductivity of samples of a poliizotsianurat foam within one year are made. The obtained data well are approximated by the offered equation. The determinated parameters of the equation have allowed to calculate heat conductivity of material in steady state. This heat conductivity can be used as the declared value of heat conductivity of mate- rial in a dry state, and also for determination of calculated values under operating conditions A and B on SN «Thermal performance of buildings». Keywords: heat conductivity, polyisocyanurate foam, polyurethane foam, diffusion of gas in polymeric materials.
V.G. GAGARIN, Doctor of Sciences (Engineering), Corresponding member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
P.P. PASTUSHKOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
P.P. PASTUSHKOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)
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2. Bjrn P.J. Traditional, state-of-the-art and future ther- mal building insulation materials and solutions – Properties, requirements and possibilities. Energy and Buildings. 2011. Vol. 43, pp. 2549–2563.
3. Willems W.M., Schild K. Dämmstoffe im Bauwesen. In Bauphysik Kalender. Simulations- und Berechnung-sverfahren. Herausgegeben von Nabil A. Fouad. Berlin. 2015, pp. 33–110.
4. Nemova T.N., Lezhneva Yu.A., Tsvetkov N.A., Alekseeva E.G. Effect of changes in the thermal conductivity of thermal insulation materials on the thermal losses of main pipelines. Vestnik Tomskogo gosudarstvennogo arkh- itekturno-stroitel’nogo universiteta. 2016. No. 5 (58), pp. 151–160. (In Russian).
5. Maxwell J.C. A Treatise on Electricity and Magnetism. 3 rd ed. Oxford. 1904. 504 p.
6. Gagarin V.G. Theory of the state and transport of moisture in building materials and thermal performance of the enclosing structures of the buildings. Doct. Diss. Engineering. Moscow. 2000. 396 p. (In Russian).
7. ASTM Standard C1303/C1303M – 12. Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation. March 2012.
8. Gagarin V.G., Pastushkov P.P. Quantitative assessment of energy efficiency of energy saving measures. Stroitel’nye Materialy [Construction Materials]. 2013. No. 6, pp. 7–9. (In Russian).
For citation: Gagarin V.G., Pastushkov P.P. Changes in the time of thermal conductivity of gas-filled polymer thermal insulation materials. Stroitel’nye Materialy [Construction Materials]. 2017. No. 6, pp. 28–31. DOI: https://doi.org/10.31659/0585-430X-2017-749-6-28-31. (In Russian).