Abstract
Computer modeling of heat transfer in the air volume of residential buildings was carried out taking into ac-count the effect of heat islands. The model includes directly the air volume, limited on both sides by the surfaces of asphalt and the wall of the building, as well as a model of the human body located at a given distance from the wall. In accordance with the climatic features of the territory of the Oryol region in the summer months with low cloudiness, the initial conditions of the computational problem are formed, which determine the modes of heat ex-change of heated surfaces with the air of residential buildings. For each of these modes, numerical modeling of natu-ral convective processes in the considered air volume was carried out. For this, differential equations of energy, mo-tion and continuity are solved for the system "complex of heated surfaces - air volume" for each combination of initial conditions, as well as various positions of the human body model relative to the heated wall of the building. It has been established that as a result of heat exchange in the air volume, a convective cell is formed, the shape and dimen-sions of which are determined by the temperature regime of building walls and asphalt. The influence of heat transfer processes on the surface of the human body on the parameters of this cell is revealed. The shape of this cell is estimat-ed under various initial conditions. Differences in heat fluxes on the surfaces of the human body facing the building and away from it are estab-lished. The dependences of the convective heat transfer of a person on the distance between him and the heated wall of the building are obtained. The quantitative values of the parameters of convective heat transfer of the body under various heat transfer modes, in particular, the temperature and speed of air movement in the upward flow, as well as the values of natural convective heat transfer, are determined.
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