Homework No 4 soln eml 3100 2010

# Homework No 4 soln eml 3100 2010 - Homework No 4 Due Monday...

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Homework No. 4 Due Monday July 12 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. problem 1 T 1 298 K P1= 100 kPa V1/V2 = 17.8 k = 1.4 T2 = 942.723 4 K P2 = 5631.03 2 kPa P3 = P2= 5631.03 2 kPa qin = Cp(T3-T2) = 2000 kJ/kg T3 = 2934.75 k

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5 P2V2/T2 = P3V3/ T3 P2 = P3 V3/V2 = T3/T2 = 3.11306 1 rc = 3.11306 1 thermal effic = 0.583 T3/T4 = (V4/V3)^0.4= (V1/V3)^0.4= (V1/3.11.*V2)^0.4 T3/T4 = 2.00859 8 0.28571 4 T4 = 1461.09 7 K T3/T4 = (p3/P4)^0.285 P4 = 490.300 9 kPa 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? Qin = 8*138000=1104000 btu/h
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## This note was uploaded on 08/03/2011 for the course EML 3100 taught by Professor Sherif during the Summer '08 term at University of Florida.

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Homework No 4 soln eml 3100 2010 - Homework No 4 Due Monday...

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