# Answer to Question #18117 in Molecular Physics | Thermodynamics for Kalysta

Question #18117

A spark-ignition engine operates on an Otto cycle with a compression ratio of 9 and temperature limits of 30 degrees C and 1000 degrees C. If the power output is 500 kw, calculate the thermal efficiency and the mass flux of air. (Answers: 58.5%, 2.19 kg/s -- Solution steps needed!!)

TEXTBOOK: Schaum's Thermodynamics for Engineers (Second Edition)

TEXTBOOK: Schaum's Thermodynamics for Engineers (Second Edition)

Expert's answer

η = 1- (1/r^(k-1));

r is the compression ratio

k (CP/ Cv) [for air k=1.4]

η = 1- (1/9^(1.4-1))

η = 1- (1/9^0.4);

η = 1- (1/2.41)

η = 1-0.415

η =0.585 or 58.5 %

r is the compression ratio

k (CP/ Cv) [for air k=1.4]

η = 1- (1/9^(1.4-1))

η = 1- (1/9^0.4);

η = 1- (1/2.41)

η = 1-0.415

η =0.585 or 58.5 %

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