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Effect of Inlet/Exhaust Duct Lengths on Gas Turbine Performance
Does the extra duct length (inlet and exhaust) needed in an outdoor arrangement contribute losses to capacity of the Gas Turbine Generator?

We have completed our commercial bid evaluations and are set to award the EPC contract for three GE frame 9 gas turbines.

Then a Question came up about whether to use an Indoor or Outdoor configuration following a study that was done to help us decide which configuration to go with for our gas turbines.

In an indoor arrangement, some level of added duct length is required to bring inlet air from the exterior, and also to route exhaust outside to the Heat Recovery Steam Generators in a combined cycle power plant.

Does the extra duct length (inlet and exhaust) needed in an outdoor arrangement contribute losses to capacity of the Gas Turbine Generator?
Contributions are very much welcome.

If the "extra duct length" increases inlet and/or exhaust pressure drops, then it will have some impact on performance. It would be minimal if it is straight length, more if there are bends. You should go back to the supplier for answers.