PAGE 522 OF OTHER THERMO BOOK
Process 1–2 is an isentropic compression.
The heat addition occurs in two steps (2-3 and 3-4),
Process 2–3 is a constant volume heat addition;
Process 3–4 is a constant-pressure heat addition. Process 3–4 also makes up the first part of the power stroke.
Process 4-5 is an isentropic expansion and is the remainder of the power stroke.
Process 5–1 is a constant-volume heat rejection process
v1/v2 = compression ratio, r
p3/p2 = pressure ratio for constant volume part of heating process
v4/v3 = volume ratio for the constant pressure part of the heating process
2-3
v2 = v3
T3 = (p3/p2) * T2
Q = U3-U2
W=0
3-4
P3 = p4
T4 = (V4/V3) * T3
4-5
s4=s5
Pr5/Pr4 = P5/P4
vr5/vr4 = v5/v4 = r/vol ratio
Q=0
W = U4-U5
5-1
v5 = v1
P1/T1 = P5/T5
vr5/vr4 = v5/v4 = r/vol ratio
Q = U5-U1
W=0
Q = H4-H3
W=p(V4-V3)