A spark-ignition engine has a compression ratio of 8, an isentropic compression efficiency of 85 percent, and an isentropic expansion efficiency of 95 percent. At the beginning of the compression, the air in the cylinder is at 13 psia and 60F. The maximum gas temperature is found to be 2300F by measurement. Determine the heat supplied per unit mass, the thermal efficiency, and the mean effective pressure of this engine when modeled with the Otto cycle. Use constant specific heats at room temperature.
A spark-ignition engine has a compression ratio of 8, an isentropic compression efficiency of 85 percent, and an isentropic expansion efficiency of 95 percent. At the beginning of the compression, the air in the cylinder is at 13 psia and 60F. The maximum gas temperature is found to be 2300F by measurement. Determine the heat supplied per unit mass, the thermal efficiency, and the mean effective pressure of this engine when modeled with the Otto cycle. Use constant specific heats at room temperature.
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter15: Thermodynamics
Section: Chapter Questions
Problem 31PE: Steam locomotives have an efficiency of 17.0% and operate with a hot steam temperature of 425C. (a)...
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A spark-ignition engine has a compression ratio of 8,
an isentropic compression efficiency of 85 percent, and an
isentropic expansion efficiency of 95 percent. At the beginning
of the compression, the air in the cylinder is at 13 psia and
60F. The maximum gas temperature is found to be 2300F by
measurement. Determine the heat supplied per unit mass,
the thermal efficiency, and the mean effective pressure of
this engine when modeled with the Otto cycle. Use constant
specific heats at room temperature.
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