Steam engine and steam turbines in which steam is used as working medium follow Rankine
cycle. This cycle can be carried out in four pieces of equipment joint by pipes for conveying working
medium as shown in Figure below
Efficiency of Rankine cycle
= (H1 – H2)/ (H1 – Hw2)
where,
Hl = Total heat of steam at entry pressure
H2 = Total heat of steam at condenser pressure (exhaust pressure)
Hw2= Total heat of water at exhaust pressure
= (H1 – H2)/ (H1 – Hw2)
where,
Hl = Total heat of steam at entry pressure
H2 = Total heat of steam at condenser pressure (exhaust pressure)
Hw2= Total heat of water at exhaust pressure
The cycle is represented on Pressure Volume P-V and S-T diagram as shown in Figure below respectively.
