Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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As shown in (a) P-v diagram and (b) T-s diagram, an ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is P1 = 95 kPa and T1 = 20°C. If the maximum temperature in the cycle is not to exceed T3 = 2200 K, determine (be noted with the formula below): 9in Fin P = constant Isentropic Yout Isentropic V = constant (a) P-v diagram (b) T-s diagram (a) the temperature T2 after the compression (K). (b) the temperature T4 after the expansion (K). (hint: 3 = V2 V2 V4 V4 (c) the thermal efficiency of the cycle (%). ************ ********** O ideal gas equation of state: Pv = RT, PV = mRT, T2 P2V2 T1 k-1 2 ideal gas undergoing an isentropic process: %3D 3 constant specific heats and gas constant: kJ = 1.005 kg · K' kJ Cy = 0.718- kg · K' kJ R = 0.287 Cp = k = 1.4, kg · K 4 efficiency of diesel engine T4 – T1 k(T3 – T2) n = 1– *** *******************************************
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Transcribed Image Text:As shown in (a) P-v diagram and (b) T-s diagram, an ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is P1 = 95 kPa and T1 = 20°C. If the maximum temperature in the cycle is not to exceed T3 = 2200 K, determine (be noted with the formula below): 9in Fin P = constant Isentropic Yout Isentropic V = constant (a) P-v diagram (b) T-s diagram (a) the temperature T2 after the compression (K). (b) the temperature T4 after the expansion (K). (hint: 3 = V2 V2 V4 V4 (c) the thermal efficiency of the cycle (%). ************ ********** O ideal gas equation of state: Pv = RT, PV = mRT, T2 P2V2 T1 k-1 2 ideal gas undergoing an isentropic process: %3D 3 constant specific heats and gas constant: kJ = 1.005 kg · K' kJ Cy = 0.718- kg · K' kJ R = 0.287 Cp = k = 1.4, kg · K 4 efficiency of diesel engine T4 – T1 k(T3 – T2) n = 1– *** *******************************************
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