Numerical study of the effect of the turning angle on heat transfer in multilayered elements of external enclosure structures

Abstract

When building low-rise buildings with a variety of structural elements, it is important to have an idea of their thermal state in extreme heat exchange conditions. Therefore, the study of heat transfer processes in heat-stressed elements of external fences is relevant and of considerable practical interest. The purpose of this work is to conduct parametric studies in typical angular fragments of inhomogeneous enclosing structures with u-turn angles from 60 to 150°. At the same time, the analysis of the thermal state is carried out for both external and internal angles. The mathematical modeling of spatial heat transfer in the fragments under consideration is based on the solution of a nonlinear system of differential equations of thermal conductivity with corresponding boundary conditions by the finite element method using the Thermal module included in the ANSYS software package. The analysis of numerical results given for three types of enclosing structures made using various technologies allowed us to clarify the influence of their geometric and thermophysical characteristics on the distribution of temperature and heat flow over the thickness of the fragments under consideration, as well as to determine the change in these parameters on both the internal and external surfaces of the structure. To establish that for all types of walling with increasing rotation angle, the temperature in the inner corner of the structure decreases, and in the outer increases, and the density of the heat flow behaves vice versa; the distance from the corner to the area stabilization with increasing angle of rotation reduces, smiling for all types of structures for temperature and heat flow; an increase in the thermal resistance leads to a temperature increase and decrease of the heat flux in the corner tend to be developed fragments; issue recommendations for creating energy-efficient structures that meet modern requirements.