الفهرس 
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Abstract
ABSTRACT
The gas turbine cycle is being extensively used for power generation across
the world. Power generation with higher efficiency and lower capital costs is
highly needed. Nowadays, global warming and climate change have become
vital issues, prompting investigations into the effects of changing climate
conditions, temperature, humidity, and pressure on the performance of the gas
turbine. The change in temperature, humidity, and pressure of atmospheric air
significantly affects the power generated by gas turbines.
The present work introduces an energy and exergy analysis of gas turbine.
Furthermore, economic analysis is presented for its hybrid cooling system. The
studied parameters are; polytropic efficiency, pressure ratio, inlet temperature,
and inlet relative humidity. Energy, exergy and economic (3E) analysis of the
gas turbine is performed using the EES code V9.498-3D.
The results demonstrate the parameter effect on the performance, the 1st
and 2nd law efficiency, the exergy, and the exergy destruction ratio of the gas
turbine and its components. These results include two cases. The first case is the
specific condition that is based on the performance per unit mass. The second
case is presented here as a new criterion based on density ratio (actual humid air
density to dry air density at standard temperature).The results show that this
criterion is more realistic than conventional special cases. A new type of
compressor, combustion chamber, turbine, and gas turbine map are herein
introduced. Furthermore, the present results demonstrate that the first and
second law efficiency give quantitative and qualitative map pictures.
In the present study, a new solution was introduced to operate the gas
turbine in hot climates at its standard temperature, which is a hybrid cooling
system (evaporative air cooling and absorption chiller). Economic analysis is
ABSTRACT III
achieved on the basis of comparing the hybrid system with evaporative air
cooling and absorption chillers.
The cost of the cooling system is calculated as a percentage of the gas
turbine’s cost. The payback period, cost ratio, and energy saving cost ratio are
demonstrated in the economic analysis. This analysis illustrated that an
absorption chiller has a high initial capital cost and a long payback period when
compared with evaporative cooling. On the other hand, absorption chiller can
control air temperature to a specified inlet temperature and is not influenced by
ambient conditions. Low RH and temperature climatic conditions have been
shown to be more effective for evaporative cooling.
The present hybrid cooling system reduces the back-period cost if it uses a
chiller system. Adding an evaporative cooling system before the chilling system
reflects on the downsizing of the chilling system. It means low initial capital
investment costs and low total annual costs.