Temperature Distribution and Heat Flux of a Furnace

Prof. Charlton S. Inao

FEA Thermal Analysis

CONDUCTION

CONVECTION

RADIATION

Given Data:• Outer Wall, 300 x 300• Inner Wall , 120 x 120• Furnace opening , 100x 100• Kc= 0.01 W/mK, thermal conductivity of the concrete wall (Mat’l No. 1)• Kb=0.0057 W/mK, thermal conductivity of the brick wall (Material

No.2)• T=673 K temp within the furnace• K1= 0.208 W/m2K, convection heat transfer coefficient in the furnace

• Ta= 253 K temperature of the surrounding air, where the outside wall is exposed to.

• K2=0.068 W/m2K, convection heat transfer coefficient of the outside wall and the surrounding air

Define Element types

Thermal conductivity for material No.1

Thermal conductivity for Material No. 2Click Material (pull down menu), then New Model

Modeling of a Furnace

Outline of Brick and Concrete Wall

Define Mesh Size Controls

Glue the areas, after performing mesh size controls,

Before meshing is done, it is necessary to specify

material numbers for theconcrete and the brick

walls.

From ANSYS Main Menu select Preprocessor →Meshing →Mesh

Attributes→ Picked Areas.

Specify Material Numbers for the Concrete(1) and Brick (2) Walls

Material Number for Concrete WallPreprocessor >Meshing>Mesh Attribute>Pick Areas

Material Number for Brick Wall

After defining the two areas, we can now Mesh the area., free

Be sure material numbering is ON, in Plot Controls ,Numbering, Attribute Numbering, Material Number