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Homework No. 4
Due Friday July 16
Assuming cold air standard assumptions
1.
The compression ratio for an ideal Diesel Cycle is
17.8.
At the beginning of the
compression stroke the pressure is 100 kPa and the temperature is 25 deg C.
The
heat transfer to the cycle is 2000 kJ/kg.
Determine the temperature and pressure
at the end of each process in the cycle.
Determine the thermal efficiency for the
cycle.
2.
For the cycle above, assume the engine consumes 8 gallons of diesel fuel per hour
and that the heating value for the fuel is
138,000 btu/gallon.
What is the
theoretical power output of the cycle in Hp?
3.
A
50 Hp diesel engine for running an emergency generator in a building has a
compression ratio of 19 with
a cutoff ratio of 1.8.
It rejects its heat
by way of
cooling water that goes to a radiator.
The cooling water enters the engine at 85
deg F and leaves at 110 deg F.
What flow rate of cooling water is required in
gallons per minute (gpm)?
What size sch 40 steel pipe (inches) would you use to
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 Summer '08
 Sherif
 Heat Transfer

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