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4. The mole fractions of gases in a mixture A are 69% N2, 1% Argon, and 30% O2. The
mole fractions of gases in a mixture B are 50% N2, 30% water vapor, and 20% O2.
Assume that a Brayton cycle can be operated using either of the two gas mixtures as the
working fluid. By plotting the '14 law efficiency vs. compressor pressure ratio' diagrams,
find the critical pressure ratio Pre for each of the gas mixtures by assuming Prer as the
pressure ratio after which the gain in the thermodynamic efficiency is small enough (say.
a less than 3% increase). Please comment on the observed results (for example, why is
Pra high for one mixture than the other and which would you suggest for use as the
working fluid in this application?).​

Answer 1

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