Spark-ignition engine has a compression ratio

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Reference no: EM13719111

Use constant specific heats at room temperature. Round final answers to one decimal place

A spark-ignition engine has a compression ratio of 7.9, an isentropic compression efficiency of 83.3%, and an isentropic expansion efficiency of 95.9%. At the beginning of the compression the air in the cylinder is at 13 psia and 60 °F. The maximum gas temperature is found to be 2300 °F by measurement.

Determine the

a) specifc heat addition, (Btu/lbm)

b) thermal efficiency, (%)

c) mean effective pressure of this engine when modeled with the Otto cycle. (psia)

Reference no: EM13719111

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