Question

Air at 14.7 psia, 40 oF enters an ideal four-stroke Diesel cycle with a compression ratio of 20 and a displacement of 300 in3. It runs at 2100 RPM and the maximum temperature is 3300 oF. The fuel has an energy content of 19,360 Btu/lbm.

a. The power output of the engine in Hp b. The cycle thermal efficiency c. The fuel consumption rate in lbm/hr

Answer 1

ANSORY Given that the ay P214--1p31Q 0-101352Mpa T1 -40°F 277596K. MK=26-) V220 N=200rpm Displacement. = 300 in3 20.0049173 T3 = 330094 = 2088-706K HV=191360 RTU Ilbo E15031-31 kJ/kg To=277.514X2004 To=920-0724 Q, (theat supplied) = (pl T3-To) =1.005 (2088-706-920072) =1174-477 kJ/kg Ecco het ) also TR also rk243 13 2088-706 To = 920-072 = 22701

TH = 2088-706 - T : 2088706 (8.8101704 T4 = 874-7488 Qy=CvCT4-T) = 6-718 874-748–27715%) = 498-756 kJ /Kg. thermal efficiency = l-182 = 428-756 1174477 =1-03650 = 0.6349 Whet=0, xn cycle = 1174.477 X063429 =745-675 kJ/kg Vo = RTL = 0.287X27.594 0.1013528103 = 0-786 m3 kg h = 0.786 20 V2=0·039 m3/kg

V -V = 45-675 (0-786–0-039) =998-226&pa. Break Powe3 = MCP XA XLXN . 2x60 = 998-226x0.00441 x2100 120 - 85-712 klo =115012 hp. (fi) fuel consump Hon rate nel 8p mix by mes one 89772 0634984503):36 =-3.0X163 kg sec =-23-80 lbm) ho.