Keyword: «thermal conductivity»

Fragments of constructional climatology, viewed as the issues forming microclimate of the premises and providing for the conditions of daily life activities comfortable for people are considered. This approach taken within the frames of the course «Molecular Physics» may promote more respectable attitude of the students of Civil Engineering Faculty to Physics as a school subject.

Modeling of an electrothermal process in temperature field estimating is considered through the example of one-dimensional thermal conductivity. The use of this technique is justified by the need to consider initial and boundary conditions if mathematical tools are used. This circumstance complicates the process of obtaining analytical solutions and in some cases makes it impossible. The presented type of heat processes modeling is based on similarity of equations which describe thermal and electrical processes thus allowing us to recalculate the potential distribution obtained in modeling into the actual value of retaining walls temperature field.

The impact of climatic factors in the conditions of the Far North and the Arctic, as shown by the work of foreign and domestic researchers, reduces the strength properties of polymer composite materials (PCM). The destruction processes occurring in the PCM under the influence of solar radiation and alternating ambient temperatures can also affect the thermophysical properties, one of the characteristics of which is thermal conductivity. The purpose of the work is to study the thermal conductivity of PCM samples under the influence of solar radiation and extreme climatic temperatures of the surrounding air.

The thermotechnical characteristics of a thermally insulated door panel used in the manufacture of entrance door blocks for public buildings in low temperature conditions have been determined. An installation based on a ‘Terkon’ signal converter and a climate chamber was used for the study. Mathematical modeling was carried out using the ‘COMSOL’ software with boundary conditions of the 3rd kind – heat transfer at a difference in ambient and surface temperatures inside and outside the climate chamber.

At present, a large amount of experimental data has been accumulated on the thermo physical characteristics of soils at positive and negative temperatures. To generalize these data and to reduce the amount of experimental work carried out, it is necessary to systematize and expand the work on the calculation of thermal conductivity of soils. In this paper, a method for calculating thermal conductivity for fine soils in frozen and thawed states is proposed. The calculation models used include a shell model in combination with a model with interpenetrating components. An approximation of the dependence of volumetric heat capacity on temperature was experimentally obtained and the amount of unfrozen water was calculated to account for the temperature dependence of the thermal conductivity of fine soil.