Travaux dirigés n°4 : Machines thermiques

T1= 400 T2=
300 T3= 20
T
1
T
2
T
3
T1, p1, T2γ=cp/cv
2
1
V
p
3
T1, p1, T2γ Q W
T1, p1, T2γ
T1= 300 T2= 600 p1=
1γ= 5/3
T1T2

(ABCDA)
AB CD BC DA
R1=VA/VBR2=VD/VCR1R2R1> R2>1
(p, V )
A, B, C D R1R2γ=Cp/CV
R1= 21, R2= 7 γ= 1.4
Q2(Q2>0) Q1W
T2= 273 T1= 293
W Q1
e=Q2/W
n γ =cp/cv
p0
p1(p1> p0)T2T0
1
p1T1,(T1< T 0
1)
p1p0T1T0
2
p0T2,(T0
2< T2)
(p, V )
T0
1T0 2p1, p0, T1, T2γ
Q1
Q2=−
T0
1
T2=−T1 T0
2
e
T0
1T0 2e= 6
n γ

A B
CvA B
Ta,i Tb,i
A B
A B A B
Ta,f Tb,f
Cv, Ta,i Tb,i
A
B
T0