The Brayton cycle (1–2–3–4–1) can be modeled as a closed cycle with air (ideal gas with known constant properties) with a mass flow rate of m˙ B = 60 kg/s. The minimum and maximum pressures of the Brayton cycle are known and equal p B min = 0.3 MPa and p B max = 1.6 MPa, as well as the absorbed power Q˙H = 50 MW and the minimum temperature (T1 = 25ºC) of the cycle. Knowing that all processes occur in devices that operate in steady state, calculate the following parameters for each cycle: ( A ). The temperature at all points; ( B ). The compression and expansion power of each Brayton-Rankine cycle, as well as the absorbed/rejected heat transfer rate. ( C ). The efficiencies of each cycle, as well as the overall efficiency of the combined cycle (The combined cycle efficiency is calculated from the sum of the net work of the cycles under the heat supplied to the combined cycle).
The Brayton cycle (1–2–3–4–1) can be modeled as a closed cycle with air (ideal gas with known constant properties) with a mass flow rate of m˙ B = 60 kg/s. The minimum and maximum pressures of the Brayton cycle are known and equal p B min = 0.3 MPa and p B max = 1.6 MPa, as well as the absorbed power Q˙H = 50 MW and the minimum temperature (T1 = 25ºC) of the cycle.
Knowing that all processes occur in devices that operate in steady state, calculate the following parameters for each cycle:
( A ). The temperature at all points;
( B ). The compression and expansion power of each Brayton-Rankine cycle, as well as the absorbed/rejected heat transfer rate.
( C ). The efficiencies of each cycle, as well as the overall efficiency of the combined cycle (The combined cycle efficiency is calculated from the sum of the net work of the cycles under the heat supplied to the combined cycle).
( D ). The entropies generated from each process, as well as the total entropy for each cycle.
General data: R = 0.286k J/(kgK), k = 1.4, cp = 1k J/(kgK
Step by step
Solved in 3 steps
