s15.2 heat engines and the second law of thermodynamics →d C, (ld-l) e 2c=nc, (T-T) d →e T TV. O b→CTv"=T b E=1 Ratio of compression s15.2 heat engines and the second law of thermodynamics (c) Diesel cycle P b→cQn=mcp(T-T) d→)aQl=nc(T-T) Th V2 2 c b→c T V c→)dTJ"=Tvy 2 P)ab 2-1=Tyr-l 88 1 1 1 1 ( ) 1 1 1 − − = − = − = − − − = − r r i f c b d c e b V V T T T T T T α ε f i V V α = Ratio of compression QH W QC a b c d V f Vi V P e §15.2 heat engines and the second law of thermodynamics ( ) ( ) C V e b H V d c Q nc T T Q nc T T = − c →d = − e →b 1 1 1 1 − − − − = = γ γ γ γ f f T V T V T V T V b i c d →e d e i b →c (c) Diesel cycle a d c b V o p V 2 V3 V1 QH QC ( ) ( 1) ( ) 1 1 2 1 3 2 1 2 3 − − = − − V V V V V V γ γ γ ε §15.2 heat engines and the second law of thermodynamics b→c 3 2 V V T T c b = 1 1 2 1 3 1 1 1 − − − − = = γ γ γ γ T V T V T V T V b a d c c→d a→b ( ) ( ) C V d a H P c b Q nc T T Q nc T T = − b →c = − d →a