Question

#4. An air-standard Diesel cycle has a compression ratio of 16 and a cut-off ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27 °C, Taking into account the variation of specific heats with temperature, determine (a) the temperature at the end of the heat-addition process, (b) the pressure and temperature at the end of expansion process, and (c) the total exergy destruction associated with the cycle, assuming a source temperature of 2000 K and a sink temperature of 300 K.

Answer 1

solutions : реац - (Turope Comледin) - at T1 =3ook from table A-178 41=214:07 ksling uri=621.2 vre = hver at very 2 to 16212) Vr2= 38.825 From table Al78 at V12= 38.845 T2 = 862.4k t2 = 890.965lly porcees 2-3-C paconetat, heat addition) 13 = 33 72 = 2 T2 = 2(8624) 3=1724.8k con tall A-17 at T3= 1724.8k 13-1910.6 kilig Voz= 4.546

procees 3-4 : (Prentopic Empersion) Nay = y 2 (193) = 4 - Vns) = 4.584) Vuy= 36-37 From table A-178 at Vry= 36 37 Ty=885k Heat supplied Olin a ch3-he) z (1910-6-190-9) Qinz 1019.7kola generation Betropy 2000 Sgen=2.88945-keslagle (o tatal energy destruction: Ndert = To Csgen) = 3002·88915-) Honey=866.745 ksliga