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Are gas turbines more efficient than ic engines?

There is two types of efficiencies.

-mechanical efficiency and

-thermal efficiency.

Now, mechanical efficiency of gas turbine is higher than that of I.C engine.

But thermal efficiency of gas turbine is lesser than that of I.C engine irrespective of the size of turbine. In order to get efficiency of IC engine gas turbine should be provided with additional auxiliaries such as intercooler, regenerator, and reheater which results in complex system and higher cost . Obviously in small gas turbines it is not feasible to include above mentioned auxiliaries that is why small sized gas turbines are less efficient than IC engines.
By-AaWaRa_Sanju
"ROYAL MECHANICAL"

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