Choose the wrong statement: (a) bleeding increases the...

Choose the wrong statement:
(a) bleeding increases the thermodynamic efficiency of turbine
(b) bleeding increases the net power developed by turbine
(c) bleeding decreases the net power developed by turbine
(d) boiler is supplied with hot water due to bleeding.

Key Concepts

Feedwater Heating

Feedwater heating is a process where the water entering the boiler is preheated, typically by using steam extracted (bled) from the turbine. This preheating improves the thermal efficiency of the steam cycle by reducing the amount of energy needed to convert water into steam in the boiler. It highlights the balance between efficiency gains and the loss of potential work due to extraction.

Net Power Output

This concept refers to the actual power that is produced by the turbine after accounting for any losses or reductions, such as those caused by bleeding. When steam is extracted from the turbine for auxiliary purposes like feedwater heating, the effective mass flow for power generation decreases, often leading to a reduction in the net power output of the turbine.

Thermodynamic Efficiency

In the context of turbine cycles, thermodynamic efficiency measures how effectively the energy in the working fluid is converted into useful work. Bleeding can increase the overall cycle efficiency by raising the temperature of the feedwater before it enters the boiler, thereby reducing the fuel input required. However, it creates a trade-off between increased efficiency and decreased mechanical output from the turbine.

Bleeding in Turbines

This refers to the process of extracting a portion of the steam from a turbine's flow during expansion. The extracted steam is often used for secondary purposes, such as preheating the feedwater in a boiler, which helps in improving the cycle efficiency. However, this extraction reduces the mass flow available for power generation in the turbine.

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