Thermal #2: Heat flux
analysis of a composite modular wall
Introduction:
In this
example you will determine the heat flux through the composite modular
wall shown in the figure.
Physical Problem:
A
composite wall is widely used in cold places to insulate buildings from
the cold outside surroundings. It typically consists of insulating
material packed inside a wall. The insulating material is usually in two
layers and is staggered. In this problem we will model a section of such
a wall and determine the heat flux through the wall. This gives an
estimate of the amount of heat that needs to be supplied to maintain the
room temperature.
Problem Description:
![bullet](../_themes/ks-modular/modbul1.gif) |
The outer material
of the composite wall is steel with thermal conductivity of 20 W/m K
|
![bullet](../_themes/ks-modular/modbul1.gif) |
The insulating
material has a thermal conductivity of 0.1 W/m K. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Units: Use
S.I. units ONLY |
![bullet](../_themes/ks-modular/modbul1.gif) |
Geometry:
See figure. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Boundary
Conditions:
The bulk
temperature on the left of the wall is 220K, and the Film
Coefficient is 200 W/m2K. On the right side the bulk
temperature is 300K, and the Film Coefficient is 20 W/m2K. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Objective:
![bullet](../_themes/ks-modular/modbul2.gif) |
To determine the
heat flux through the given length of the wall. |
![bullet](../_themes/ks-modular/modbul2.gif) |
To plot the
temperature distribution. |
![bullet](../_themes/ks-modular/modbul2.gif) |
To generate the
vector plot of the heat flux. |
|
![bullet](../_themes/ks-modular/modbul1.gif) |
You are required to
hand in print outs for the above. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Figure:
|
![bullet](../_themes/ks-modular/modbul1.gif) |
IMPORTANT:
Convert all
dimensions and forces into SI units. |
STARTING ANSYS
![bullet](../_themes/ks-modular/modbul1.gif) |
Click on ANSYS
6.1 in the programs menu. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Select
Interactive. |
![bullet](../_themes/ks-modular/modbul1.gif) |
The following menu
that comes up. Enter the working directory. All your files will be
stored in this directory. Also enter 64 for Total Workspace and
32 for Database. |
![bullet](../_themes/ks-modular/modbul1.gif) |
Click on Run.
|
![](t2_wall_files/image002.jpg)
MODELING THE STRUCTURE
![bullet](../_themes/ks-modular/modbul1.gif) |
Go to the ANSYS
Utility Menu.
![bullet](../_themes/ks-modular/modbul2.gif) |
Click
Workplane>WP
Settings.
|
![bullet](../_themes/ks-modular/modbul2.gif) |
The following
window comes up: |
|
![](t2_wall_files/image003.jpg)
![bullet](../_themes/ks-modular/modbul1.gif) |
Check the
Cartesian and Grid Only buttons |
![bullet](../_themes/ks-modular/modbul1.gif) |
Enter the values
shown in the figure above. |