Homework No 3 eml 3100

# Homework No 3 eml 3100 - compression ratio of 8.5 It...

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Homework No. 3 Due Wednesday July 7 1. Assuming cold air standard assumptions The compression ratio for an Otto Cycle is 9.2. At the beginning of the compression stroke the pressure is 100kPa and the temperature is 22 deg C. The heat transfer to the cycle is 2100 kJ/kg a. determine the temperature and pressure at the end of each process in the cycle b. determine the thermal efficiency 2. For the cycle above, assume that the engine consumes 3.75 gallons of gasoline per hour and that the heating value of the gasoline is 125,000 btu/gallon. What is the theoretical power output of this cycle in Hp? Hint: you already calculated an efficiency…review the lecture on efficiencies. 3. A 100 Hp gasoline engine for running an air compressor in a building has a
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Unformatted text preview: compression ratio of 8.5. It rejects its heat by way of cooling water that goes to a cooling tower. The cooling water enters the engine at 85 deg F and leaves at 100 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 route this cooling water to and from the engine to the cooling tower? You can assume an ideal Otto cycle. 4. A 300kW electric generator is powered by a gasoline engine with a compression ratio of 10. The efficiency of the electric generator is 95%. Estimate the consumption of gasoline by this engine in gallons per hour....
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