2 Brayton Cycle with Reheat A Brayton cycle can be used with a reheat process using two turbines and bringing the flow b

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2 Brayton Cycle With Reheat A Brayton Cycle Can Be Used With A Reheat Process Using Two Turbines And Bringing The Flow B 1 (54.57 KiB) Viewed 40 times

2 Brayton Cycle With Reheat A Brayton Cycle Can Be Used With A Reheat Process Using Two Turbines And Bringing The Flow B 2 (54.12 KiB) Viewed 40 times

2 Brayton Cycle With Reheat A Brayton Cycle Can Be Used With A Reheat Process Using Two Turbines And Bringing The Flow B 3 (56.98 KiB) Viewed 40 times

2 Brayton Cycle with Reheat A Brayton cycle can be used with a reheat process using two turbines and bringing the flow back to the high temperature in between. This is shown below. QHeat Reheat Comp 6 Vám gas, with kJ The cycle system uses air as a working fluid, which can be treated as an ideal and c₂ = 1.01 k constant fluid properties: k = 2 = 1.4, R = 0.287 kg K Cu - 0.76, and the temperature = 100 kPa. . The flow rate of helium through the system is m and pressure at State are: T₁ = 12 °C and P₁ • The compressor has a compression ratio of 14, and an isentropic efficiency of = W comp HP Turb LP Tub WLP
7s = 76%. The heater process, 2-3, raises the flow to a TH temperature of T3 = 1700 °C. (Combustion of natural gas can produce this temperature.) . The high pressure turbine has an isentropic efficiency of THP.S = 87% and the intermediate pressure, Pinter = P₁ = Ps, drops to 920 kPa through the turbine.. - . The reheat process, -6, raises the temperature of the flow back to T₁ = TH= 1700 °C, the low pressure turbine also has an isentropic efficiency of NLP. 87%. The heat rejection process, 6-1, is isobaric. 2 Model this cycle, to determine: 1. The net power output for these operating conditions, Wnet = WHP +WLP-W comp 2. The total heat input to the cycle for these operating conditions, Qtot = Qheat + Qreheat Wast 3. The thermal efficiency of this cycle for these operating conditions, 7th =
Model this cycle, to determine: 1. The net power output for these operating conditions, Wnet = WHP +WLP-W comp 2. The total heat input to the cycle for these operating conditions, tot heat + Qreheat 3. The thermal efficiency of this cycle for these operating conditions, th=Wat 4. Vary the intermediate pressure, Pinter = P₁ = Ps, between 400 kPa and 1200 kPa to see the effect on 7th and Wnet. Make plots of the efficiency and the net power with respect to the intermediate pressure and make some comments about the variation. 5. Compare the values of power output, Wnet, and thermal efficiency, na to a Brayton Cycle without reheat. (Note: if you make your intermediate pressure 100 kPa, all your power will be generated with the high pressure turbine, and if you make your intermediate pressure 1400 kPa, all your power will be generated with the low pressure turbine, and you are effectively running a Brayton Cycle without reheat.) Describe what you see in these results that explain why reheat is a useful addition to a cycle?