Question

A cold standard air Diesel cycle has a compression ratio of 18. The heat transferred to the working fluid per cycle is 2000 kJ / kg. At the beginning of the compression process cycle, the pressure is 100 kPa and the temperature is 25 ° C. Determine (a) The pressure in each state of the cycle, (b) The cut-off ratio, (c) The thermal efficiency, (d) The net work per unit of mass and (e) the effective mean pressure.

Answer 1

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Qin Wout 2 Part Win 1-2 process Y1 T2 TI TL = (11) - (1.8) 19-1 298 T2 = (290)(3-198)=946.95k ( ) = (49) (946 1.4-1 946.95 PL 14 278 100 P2 = 5720kPa ( 2-3 process Pz = P3 =57201 Pa q = 2000 ls/kg q= Cp (13-72) 2000 = 1:005 (13-946-45) T3 = 2937K. 3-4 process 7-1 - 2939 2937 Vc = T3/12 946-15 = 9333 K os, Iy=(18)/44 327143 kPa 3271.73 bar 2932 = 3.1

n = 1-1 2011 ro 17(8-1) 14 ņ= 1-1 3.1 (1.4)(3-1-1) n=0.585 = 58.5% nee = 9, * 7 = 2000X0-585 = 11906-1 KJ ( ) 1814-1 3 VI ERTI -(0-287)(298)_0.855 m PI loo V2-VI-0.855 -0.047 m3 18 A m²/kg 18 me p = Whet - 1170.61 – 169.75 VI-V2 (0-85-004) kPa

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