In a condensing turbine, the exhaust in a vacuum goes to the condenser and it represents wasted energy. Whereas in a backpressure turbine, the exhaust from the steam turbine is used effectively in a downstream process. In certain changed situations, an existing Extraction Condensing Turbine may have to be changed to Back Pressure Turbine. https://turtleturbines.com/conversion-of-steam-turbine-from-condensing-to-back-pressure/
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