Fabrication Of Aluminium Window

CHAPTER THREE
3.0    SELECTION OF MATERIAL
An engineer is always facing a lot of problems, when it comes to the aspect of material selection. An Engineer is always limited to the material at its vicinity particularly in Nigeria there is the need for them to improvise with the little materials.
There are some parameters that an engineer must consider before choosing certain materials, some of which are listed below:
1. Physical properties
2. Strength
3. Fabricability
4. Economic cost
5. Chemical composition
6. Merchantability
PHYSICAL PROPERTIES
The physical properties include ductility, malleability, conductivity; tensile strength, melting point, density. 
STRENGTH
This is the ability of the materials to withstand and resists some external forces that can lead to fracturing a shearing of the materials.
FABRICABILITY
This is ability of a metal to be made into various shapes by either casting or forging. This property help to save both time and money that will be used for the production process.
ECONOMIC COST
An engineer should be able to select materials that will cost less, last longer and will serve the purpose it is meant for.
By considering is Aluminum, is used for all the component parts of the project, the frame, murtins bar, head.
Aluminum is purposely used for the project because of its
Properties which include [1].
I. Lightness is weight
ii. Durability
iii. Malleability
iv. High tensile arid compressive stress
v. Wear resistance
vi. Shock absorbing capability
3.1 THE PARAMETERS AFFECTING THE WINDOW PERFORMANCE
The physical and operational characteristics of the buildings are important issues in developing the reference building b1ock for the simulation model. The main parameters affecting the window performance are divided into:-
3.1.l    THE PARAMETERS AFFECTING THE WINDOW PERFORMANCE(W.P) ON THE BUILDING SCALE
The main parameters affecting the W.P on the building
Scales are as follows: Orientation of the building
•    Position of the building
•    Building shape factor
•    Dimension
•    Physical properties of surrounding surface.
3.1.2     THE PARAMETERS AFFECTING THE WINDOW PERFORMANCE (W.P) ON THE HOUSING UNIT SCALE
The main parameters affecting the window performance on the housing unit scale are as follows:-
•    Position of the unit or room within the building
•    Dimension of the unit and its shape factor
•    Orientation
3.1.3    THE PARAMETERS AFFECTING THE WINDOW PERFORMANCE (W.P) ON TRANSPARENT COMPONENT
The main parameters affecting the window performance on
Transparent component scales are as follows:-
•    Dimensions of the windows
•    Glazing components
•    Window performance parameters
•    Frame type
•    Shading devices
3.1.4     THE PARAMETERS AFFECTING WINDOW PERFORMANCE (W.P) ON TOTAL WINDOW SYSTEM
Recent advances in the technology offer many alternatives
For the energy efficient windows. [4]
•    Glass types and coatings
•    Number of glazing layers
•    Infill gas material
•    Spacer material