1. In an ideal reheat-regenerative cycle, steam enters the turbine at 6 MPaa and 400°C. After expansion to 1.4 MPaa steam is withdrawn and reheated to 300°C. Extractions for regenerative heating occur at 0.15 MPa and 1.4 MPaa and the condenser pressure is 0.01MPaa. Use mass flowrate of 1 kg/s. (total=60 points) a. Sketch the schametic diagram showing the correct state points and its components. (5 points)

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The net power (NOT TURBINE POWER) of the following steam power cycle is desired to be 25MW.Steam enters the turbine at 16 MPa, 450C, condenser at 10kPa pressure saturated liquid-steamIt enters as a mixture. Compressed liquid enters the pump at 9kPa at 35C and at 17MPacomes out. The inlet pressure to the boiler is 16.8MPa and 33C. The output from the boiler is 16.2MPa and 575C.The isentropic efficiency of the turbine is 90%, and that of the pump is 83%. Find the mass flow rate that will provide the required net power.

Compare the thermal efficiency and turbine-exit quality (temperature if superheated) at the condenser pressure for a simple Rankine cycle and the reheat cycle when the boiler pressure is 5 MPa, the boiler exit temperature is 500°C, and the condenser pressure is 20 kPa. The reheat takes place at 0.5 MPa and the steam leaves the reheater at 500°C. (Enthalpies are in KJ/kg.) Without the reheater, the heat added is: The enthalpy entering the condenser is: The net Work is: The enthalpy entering the reheater is: Without the reheater, the net Work is:

A Brayton cycle is used to estimate the performance of an aircraft engine with nitrogen as the working fluid. The engine generates a net power of 10 MW. Nitrogen enters the compressor of the engine at 250 K and 80 kPa and is compressed to a pressure of 400 kPa. The gas exits the turbine of the engine at 450 K and 80 kPa.a. Calculate the mass flow rate of nitrogen through the engine.b. Calculate the thermal efficiency of the cycle.c. Determine the irreversibility per unit mass for each process and for the cycle if TH = 1500 K and TL = To = 250 K.d. Which process has the largest irreversibility?

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