Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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2. TASK 1: DEVELOPMENT OF CO2 BRAYTON CYCLE Task 1-1: Development of the Efficiency Equation of Turbine and Compressor for the Real Gas The objective of this task involves mathematical derivations of the turbine and compressor efficiency. When supercritical CO2 gas is expanded and compressed in a real gas fashion through a sequence of turbines and compressors, the isentropic formulas shown in most thermodynamic books are no longer useful. The polytropic expansion can be correlated using the definition of the isentropic expansion, as shown in Figure 2-1. P1 Isentropic P2 T T Ti Polytropic Figure 2-1. Polytropic efficiency. With the first law of thermodynamic, the mathematical derivation starts as shown below: cp cv R dividing by cv yields cp 1R cv cv or -1= R cp For adiabatic process, du dw or (1) (2) (3) (4) S 3

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