Mathematical modeling of thermal technical characteristics of external protections with air layers

Rustam Mansurov,Dmitry Efimov,Tatyana Rafalskaya,A Volkov,A Adamtsevich,A Pustovgar,T Sultanov

doi:10.1051/e3sconf/20199706007

Abstract

A screened enclosing structure of the outer wall of the building without the use of thermal insulation materials is proposed. To ensure the required thermal resistance of the outer fence, screens (cement-containing slabs) and closed air gaps between them are used. Using the ANSYS software package, the heat transfer processes were modeled in a shielded building envelope, consisting of the main (carrier) part and screens with air gaps closed between them. The features of the heat transfer process in the thickness of the outer enclosure are revealed.

Highlights

Problems of the rational use of fuel and energy resources, new technologies for the construction of pre-fabricated structures make the actual task of insulating the facades of buildings, both reconstructed and newly built
The choice of thermal insulation material is influenced by their characteristics: density, thermal conductivity, heat absorption of the surface
An alternative to a single layer of insulation can serve several air gaps; optimal air gap width is 25-50 mm; air gaps should not be made high to reduce the rate of air circulation in them, if possible, cross them in height by horizontal partitions;

Summary

Introduction

Problems of the rational use of fuel and energy resources, new technologies for the construction of pre-fabricated structures make the actual task of insulating the facades of buildings, both reconstructed and newly built. Traditional multi-layer enclosing structures consist of supporting (structural) and insulating layers. Various types of thermal insulation materials are used, which, as a rule, should be located on the outside of the fence. Are currently used as thermal insulation layers. Back in 1905, V.M Chaplin proposed to use air gaps as a heat-insulating material in enclosing structures [2]. Despite the fact that these studies were performed more than 100 years ago, previously shielded walling structures were not used in construction without the use of thermal insulation materials. The aim of the work is computer modelling in the ANSYS software package of enclosing structures that do not use thermal insulation materials. A similar approach was successfully used for the thermal engineering calculation of a multi-layer enclosing structure of the “sandwich panel” type [3]

Formulation of the problem

Approach 1

Approach 2

Approach 3

Results and discussions

Conclusions