Engineering method for estimating the temperature field of the external wall in the area of the combined interface-balcony plate

Thermophysical characteristics of structural elements of buildings and structures must meet the requirements. Therefore, the development of engineering methods for assessing the heat-shielding properties of such building elements is an urgent task. Purpose of the study. Consider the problem of developing an engineering method for assessing thermophysical properties in the area of laying a combined interfloor-balcony slab through the outer wall of a building. Materials and methods. The data known in the literature related to this problem have been analyzed. It is indicated that the problem posed is very complex, its detailed solution requires the development of a rather complex numerical model of the temperature field for each investigated element and the performance of a large amount of computational work. In this regard, an approximate engineering method based on modern achievements in the theory of heat transfer is extremely interesting for specialists. Considering the process of heat transfer in the area of laying the combined interfloor-balcony slab, it has been possible to obtain fairly simple analytical relationships to solve the problem. In this case, the combined interfloor-balcony slab has been represented as a two-sided rod of finite length, fixed in the outer wall of the building. Further, such a combined slab is mentally cut flush with the outer wall, and the actually lost or actually absorbed heat in the design scheme based on the equivalence principle is taken into account by the numerical values of the equivalent heat transfer coefficients for the outer and inner surfaces of the remaining part. Such a calculation scheme will completely coincide with the scheme of the first heat-conducting connection, widely known in the literature, the temperature on the inner surface of which is determined by the known formula. This allows one to assess the possibility of condensation in the investigated area at the specified outdoor temperature. Results. By analyzing the obtained relationships, it has been found that when designing the balcony part of the slab, it should be borne in mind that with an increase in its transverse dimensions, the possibility of condensate falling out decreases, and with an increase in its length, on the contrary, this possibility increases. Conclusion. The developed method makes it possible to have a fairly clear idea of the influence of the dimensions of the outer part of the combined interfloor-balcony slab on the possibility of condensation in its thickness in the zone of the inner surface of the outer wall of the building in the corresponding climatic conditions.