Numerical Analysis of the Influence of Humidity on the Heat Distribution in Constructional Materials
DOI:
https://doi.org/10.20998/2078-774X.2017.11.11Анотація
The purpose of this research was to perform numerical simulation of nonstationary temperature fields in isotropic constructional materials with the varied moisture content and study the influence of humidity on the local and integral parameters of temperature redistribution in the specimens. The method of finite differences was used for the numerical computation of the influence of humidity on the heat transfer in some constructional materials. The analytical expression of the characteristic time required for the heating-up of the specimen of a specified thickness to a certain temperature has been derived. The specimen was made of the material with specified heat conductivity and heat absorption coefficients. The derived expression enables a considerable simplification of the procedure used for the introduction of dimensionless parameters with the reduction of errors accumulated in the course of computations. It has been established that the influence of humidity on a change in the temperature with elapse of time at different humidity values in the region near the specimen center can be described by a single modified polynomial. Specified numerical methods enable the investigation of the influence of constructional materials on the coordinate and temporal components of 1D nonstationary temperature field at the local level. The developed software package allows for the variation both of the humidity and the specimen geometry and also the main thermophysical parameters of the specimen during the detailed analysis of the local performances of temperature field.Посилання
Shul’gin, Yu. V. (2015), “Doslidzhennya mozhlivostej energozberezhennya u tekhnologiyi virobnictva zalizobetonu[Studyofenergy saving capabilities in concrete technology]”, Bulletin of NTU “KhPI”. Series:Powerandheatengineeringprocessesand equipment, no. 16 (1125), pp. 157-161, ISSN 2078-774X.
Bogoslovskij, V. N. (1970), Stroitel’naya teplofizika [Building thermal physics], Vysshaya shkola [Higher School],Moscow,Russia.
Il’inskij, V. M. (1974), Stroitel’naya teplofizika (ograzhdayushchie konstrukcii i mikroklimat zdanij) [Building thermal physics(protecting designs of buildings and microclimate)], Vysshaya shkola [Higher School], Moscow, Russia.
Verzhbickij, V. M. (2002), Osnovy chislennyh metodov [Fundamentals of numerical methods], Vysshaya shkola [HigherSchool],Moscow, Russia. - ISBN 5-06-004020-8.
Yankovskij, A. P. (2014), “Asimptoticheskij analiz reshenia nelinejnoj zadachi nestacionarnoj teploprovodnostisloistyhanizotropnyh neodnorodnyh obolochek pri granichnyh usloviyah pervogo roda na licevyh poverhnoctyah[Theasymptoticanalysisof solutions of nonlinear transient heat conduction of layered anisotropic inhomogeneousshellswithboundaryconditions of thefirstkind on the front surface]”, Bulletin of Samara State TechnicalUniversity.Series: Physicsandmathematics, no. 1(34),pp.168-185, ISSN 1991-8615.
Kupriyanov V. N. (2015), Fizika sredy i ograzhdayushchih konstrukcij [Environment physics and protecting designs],Publishinghouse DIA, Moscow, Russia, ISBN 978-5-4323-0048-2.
Franchuk A. U. (1969), Tablicy teplotekhnicheskih pokazatelej stroitel’nyh materialov [Tables of thermal parameters ofbuildingmaterials], NII stroitel’noj fiziki [Research institute of building physics], Moscow, Russia.
