Department of Mechanical Engineering ME 322 – Mechanical Engineering Thermodynamics Lecture 27 Gas Power Generation The Brayton Cycle.

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Presentation transcript:

Department of Mechanical Engineering ME 322 – Mechanical Engineering Thermodynamics Lecture 27 Gas Power Generation The Brayton Cycle

Gas Power Cycles Much higher power output to weight ratio compared to vapor power cycles –Well suited for mobile power plants –Smaller stationary power plants Commonly known as the gas turbine Open cycle Closed cycle 2

The Gas Turbine Comparison of the schematic to the ‘real thing’ 3

Gas Turbine Examples 4

The Air Standard Cycle (ASC) Analysis A fixed amount of air modeled as an ideal gas is the working fluid The combustion process is replaced by a heat transfer from an external source All processes are internally reversible The Cold Air Standard Cycle Analysis All of the above plus … the heat capacity of the air is assumed to be constant 5

The Brayton Cycle 1-2: Reversible and adiabatic compression 2-3: Constant pressure heat addition 3-4: Reversible and adiabatic expansion 4-1 Constant pressure heat rejection 6

Brayton Cycle Analysis 7

Brayton Cycle Performance Thermal Efficiency 8

Cold Brayton Cycle Performance 9 Cold Air Standard Thermal Efficiency Processes 3-4 and 1-2 are isentropic

Cold Brayton Cycle Performance 10 Substituting... Since process 1-2 is isentropic,

Cold Brayton Cycle Performance 11 Define... Finally... we have several ways to write the cold ASC thermal efficiency,

Gas Turbine Irreversibilities Isentropic efficiencies in the turbine and compressor Isentropic efficiencies in the turbine and compressor and pressure drops in the heat exchangers 12