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Special Problems for ME 200 – Fall 2009
Special Problems 39, 40, and 41
Due Friday, December 11, 2009
SP39:
Air at the beginning of the compression stroke of an airstandard Otto cycle is at 95 kPa
and 22
C.
The cylinder volume is 2800 cm
3
and the compression ratio is 9.
During the
heat addition process, 4.3 kJ of heat is added into the cylinder.
(a) Determine the temperature (K) and pressure (MPa) at the end of heat addition process.
(b) What is the temperature (K) and pressure (MPa) after the expansion process?
(c) Calculate the thermal efficiency (%) of the cycle.
(d) What is the mean effective pressure (MPa) of the cycle?
SP40:
An airstandard Diesel cycle operates with a compression ratio of 16.7 and a cutoff ratio
of 2.
Air at the beginning of the compression stroke is at 0.1 MPa and 37
C.
The engine
is required to produce 200 kW power output.
(a) What is the maximum temperature (K) in the cycle?
(b) Determine the pressure (MPa) after the isentropic expansion process.
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This note was uploaded on 05/15/2010 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University.
 Spring '08
 GAL

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