Prob3-15% A Brayton cycle has compression ratio of 15:1 with a high temperature of 1600 K and the inlet at 290 K, 100 kPa. Use cold air properties and find the specific heat addition and specific network output. T 3 4 P = 100 kPa W net Wnet -(k-1)/k 1-1 k-1 T = T(P/P) H =po(T3-T2) = Prob4-15% A diesel engine has a state before compression of 95 kPa, 290 K, and a peak pressure of 6000 kPa, a maximum temperature of 2400 K. Find the volumetric compression ratio and the thermal efficiency. (P/P) = (v/v)* = CR4 1/k CR=v1/v = (P/P1)= = T-T(P/P) T-T3 (3/4)-1 = Efficiency from Eq.10.13 1T-T n = 1-kT3-12 P 2 3 T P 4