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BraytonCycles_web - ENU 4133 Brayton/Other Cycles...

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ENU 4133 – Brayton/Other Cycles April 19, 2011
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Brayton/Other Cycles I Description and application I Perfect gas, ideal equipment I Real gas, ideal equipment I Real gas, real equipment I Advanced/enhanced Brayton cycles I Other power cycles
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Basics The Brayton cycle is a gas (not vapor) power cycle. The fluid stays in the single-phase gas region, where ideal gas properties can often be used. It is appropriate for gas-cooled reactors. An ideal, simple Brayton cycle includes following processes. 1. Constant pressure heat addition (reactor) 2. Isentropic heat removal (turbine) 3. Constant pressure heat rejection (heat exchanger) 4. Isentropic compression (compressor)
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State Numbering T&K use the following numbering of states 1. Exit of HX, entrance of compressor 2. Exit of compressor, entrance of reactor 3. Exit of reactor, entrance of turbine 4. Exit of turbine, entrance of HX
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Perfect gas, ideal equipment Compression ratio (pressure ratio): r p = P 2 P 1 = P 3 P 4 (1) Recall relations for ratio of specific heats (T&K call this the adiabatic index, γ ), k = c p c v (2) perfect gas – h = h ( T ) only, Δ h = c p Δ T (3) and perfect gas, isentropic process: T ρ 1 k - 1 = constant (4) TP 1 - k k = constant (5)
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Work Terms Turbine: ˙
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