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Difference between open and closed cycle gas turbine.
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Closed Cycle Gas Turbine
Open Cycle Gas Turbine 
It works on closed cycle. The working fluid is recirculates again and again. It is a clean cycle.
It works on open cycle. The fresh charge is supplied to each cycle and after combustion and expansion. It is discharged to atmosphere.
The gases other than the air like Helium or Helium-Carbon dioxide mixture can be used, which has more favorable properties.
Air-fuel mixture is used which leads to lower thermal efficiency.
Since heat is transferred externally, so any type of fuel; solid, liquid or gaseous or combination of these can be used for generation of heat.
Since combustion is an integral part of the system thus it requires high quantity liquid or gaseous fuel for burning in a combustion chamber
The heat is transferred indirectly through a heat exchanger.
Direct heat supply. It is generated in the combustion chamber itself 
High thermal efficiency for given lower and upper temperature liquids.
Low thermal efficiency for same temperature limits.
Part load efficiency is better.
Part load efficiency is less compared to Closed cycle gas turbine.
Reduced size per MWh of power output.
Comparatively large size for same power output.
Since combustion products do not come in direct contact of turbine blade, thus there is no blade fouling and longer blade life.
Direct contact with combustion products, the blades are subjected to higher thermal stresses and fouling and hence shorter blade life.
Better control on power production.
Poor control on power production.
Closed cycle gas turbine plant is complex and costly.
Open cycle gas turbine plant is simple and less costly.


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