TITLE.PM5

FIRST LAW OF THERMODYNAMICS 191

dharm

/M-therm/Th4-5.pm5

This process is limited to wet region only.
Hyperbolic process (pv = constant) is also an isothermal process in the superheat region as
the steam behaves like a gas in this region. The work done during the hyperbolic expansion in a
non-flow system is given by

a

2

T= T 12

v 1 v 2

p 1

p 2

1

p

v

(a)

(b)