Numerical Study of the Thermally Conductive Finite Thickness Walls Impact on Heat Transfer Regime in a Closed System in Conditions of Radiant Energy Supply

A E Nee,P.A Strizhak,G.V Kuznetsov,A.O Zhdanova,V.E Gubin

doi:10.1051/matecconf/20153701036

Abstract

Plane problem of thermogravitational convection in a closed rectangular cavity is numerically solved in conditions of radiant energy supply to the one of the boundaries. Differential heat transfer parameters (fields of temperatures and stream functions) for the conjugate (only vertical walls, only horizontal, vertical and horizontal walls) and the nonconjugate formulation are obtained. Temperature distributions in the Y direction in the cross section along the axis of symmetry showed that the presence of heat-conducting finite thickness walls leads to a redistribution of the energy which is accumulated by gas and enclosure structures. In order to reduce the energy consumption for heating of the large premises it is advisable to abandon the traditional convective heating in many cases. The most promising is the use of gas infrared emitters for the local heating of the limited size areas where it is needed (1). An approach (2), which is based on the solution of the heat balance equation, is suggested for the analysis of heating systems with gas and electric infrared emitters. The algorithm (2) allows us to calculate the required number of emitters and their capacity. But the heat transfer model (2), as well as its further modification (3), is formulated without taking into account the free convection movement of air masses and the conjugation of gas and thermally conductive enclosure structures. Investigation of jointly proceeding processes of conduction and convection in a closed system with a source of radiant energy in conjugate formulation is of interest. The aim of this study is numerical investigation of the thermally conductive finite thickness walls impact on heat transfer regime in a closed system in a closed system with a source of radiant energy.

Highlights

In order to reduce the energy consumption for heating of the large premises it is advisable to abandon the traditional convective heating in many cases
Investigation of jointly proceeding processes of conduction and convection in a closed system with a source of radiant energy in conjugate formulation is of interest
Based on the analysis of temperature and stream function fields (Figure 2) it can be concluded that the presence of heatconducting walls of finite thickness leads to significant modifications of the temperature distribution (Fig. 2 a, c, e)

Summary

Introduction

In order to reduce the energy consumption for heating of the large premises it is advisable to abandon the traditional convective heating in many cases. An approach [2], which is based on the solution of the heat balance equation, is suggested for the analysis of heating systems with gas and electric infrared emitters. The heat transfer model [2], as well as its further modification [3], is formulated without taking into account the free convection movement of air masses and the conjugation of gas and thermally conductive enclosure structures. Investigation of jointly proceeding processes of conduction and convection in a closed system with a source of radiant energy in conjugate formulation is of interest. The aim of this study is numerical investigation of the thermally conductive finite thickness walls impact on heat transfer regime in a closed system in a closed system with a source of radiant energy

Problem formulation and solution method

Ra Pr

Results and discussion

Conclusion