28-07-2014, 04:39 PM
A TECHINAL SEMINAR ON SOLAR CHIMNEY
SOLAR CHIMNEY.pptx (Size: 487.86 KB / Downloads: 16)
INTRODUCTION
The electrical power sources could have an important part to play in the production of power.
The solar power symbolizes totally nonpolluting endless power resource , and the Solar Chimney is one of them.
Solar chimney electricity generation power plants are referred to as solar updraft towers and huge reinforced concrete structures.
Floating solar chimney (FSC) technology, is a low cost alternative of the solar updraft towers, and a major technology for the global warming elimination
The Floating Solar Chimney (FSC).
It is a tall fabric cylinder placed at the centre of the solar collector through which the warm air of the greenhouse, due to its relative buoyancy to the ambient air, is up-drafting.
THE ELECTRIC POWER UNIT.
It is a set of air turbines geared to appropriate electric generators in the path of up-drafting warm air flow that are forced to rotate generating electricity
The energy source, for the rotation of the air turbines and the electricity generation, is the horizontal solar irradiation passing through the transparent roof of the greenhouse and heating the ground beneath it
PARTS OF THE SOLAR CHIMNEY
The Collector:
Collector is the part, which is used to produce hot air by green house effect. It is usually five to six meters high and covers a very large area about thousands of m2 .
TURBINES
Turbines are used to convert air current to the mechanical energy
Turbines are placed horizontally in chimney, vertically in the collector. In order to obtain maximum energy from the warmed air, turbine blades should cover all the cross sectional area of the chimney
One big turbine or a few small turbines should be used in chimney, as can be seen from the following figures.
WORKING PRINCIPLE
Transparent roof, which is admits the short wave solar radiation component and retains long wave radiation from the heated ground. Thus, when solar radiation pass through the transparent roof it is absorbed by the ground elements and it converts into heat energy.
Heated air enters the chimney placed at the center of the roof and creates an up draught there.
Inside the chimney, turbines with electric generator produce electricity.
Comparing with the collector and turbine, the chimney efficiency is relatively low
CONCLUSION
Solar chimney power stations could make important contributions to the energy supplies in Africa, Asia and Australia, because there is plenty of space and sunlight available there.
It is very important for the future, because our resources are limited except our sun.