Abstract
An approximate procedure is proposed for calculating of the temperature field in a one-layer wall under harmonic variations of the external air temperature with regard to phase transitions of moisture within the wall. The trend of the freezing front displacement within the wall is researched as time goes on depending on relative thermal stability of the wall material and average thermal lag of the freezing layer. The engineering formulae are obtained for quantitative estimation of the front displacement offering determination of the peak value of its waves and their time lag with respect to the external temperature oscillations. The estimation of accuracy of the proposed calculation procedure is carried out and the limits of its suitability are detected. It has been shown that the error of the procedure falls in the limits of initial data under the magnitudes of the air temperature and thermal properties of employed materials meeting with in practice if the freezing front lays beyond the bounds of the violent temperature oscillation layer.
Highlights
IntroductionIn the presented paper the distribution of temperature waves in an one-layer outside enclosure is considered in view of phase transitions of moisture contained in the enclosure material
An approximate procedure is proposed for calculating of the temperature field in a one-layer wall under harmonic variations of the external air temperature with regard to phase transitions of moisture within the wall
The engineering formulae are obtained for quantitative estimation of the front displacement offering determination of the peak value of its waves and their time lag with respect to the external temperature oscillations
Summary
In the presented paper the distribution of temperature waves in an one-layer outside enclosure is considered in view of phase transitions of moisture contained in the enclosure material. The purpose of this research was to develop a technique for accounting temperature fluctuations in an enclosure under specified conditions. This is important, as any protecting design comprises a certain quantity of moisture that is absorbed from air of a premise and during a testing phase transitions while in service of an enclosure. Until now an account of an enclosure's thermal stability was not taken into consideration This will be shown below as well as the significant error because of high inertial properties of the phase border. This research on the behaviour of a freezing front plays an important role in the study of a real thermal and a humidity regime of the enclosure and the questions that are connected with the durability of protecting designs
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