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Lecture 2 3/3/2012
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Dr. walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
OTTO Cycle
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
Dr. Walid Abdelghaffar
232323 TTcuuqq vin
144141 TTcuuqq vout
34
1 kRTvpv
12
1 kRTvpv
airfor 1.4v
p
c
c
Dr. Walid Abdelghaffar
State P T v
1
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rpp 12
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inTT 1
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p
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vv 1
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Dr. Walid Abdelghaffar
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TDC BDC
Otto Cycle Assignment 1
An Ideal Otto cycle has a compression ratio of
8. At the beginning of the compression
process, the air is at 100 kPa and 17C, and
800 kJ/kg of heat is transferred to air during the
constant volume heat addition processes.
Determine a) the maximum temperature and
pressure that occur during the cycle b) the net
work output c) the thermal efficiency, and d)
the mean effective pressure of the cycle.
Dr. Walid Abdelghaffar
Otto Cycle Assignment 2
For a SI engine, the intake air pressure and
temperature are 50 kPa and 300 K
respectively. The compression ratio is 10.
Assume the heat input of 2500 kJ/kg and =
1.3. If the fuel air cycle can be simplified to an
Otto cycle; calculate the net thermal efficiency,
the maximum temperature and pressure, and
the mean effective pressure.
Dr. Walid Abdelghaffar
Otto Cycle Assignment 3
For an Ideal Otto cycle, if the inlet pressure and
temperature are 1 bar and 25 C respectively.
The compression ratio is 9 and the maximum
temperature in the cycle can not exceed 2000
K. calculate a) the net work b)the cycle net
thermal efficiency and c) the MEP of the cycle.
Dr. Walid Abdelghaffar
Dr. walid Abdelghaffar