Page 115 - Mechanical Engineer's Data Handbook

104 MECHANICAL ENGINEER’S DATA HANDBOOK

Exergy cf,=(H,-H,)-T,(S,-S,) Constant temperature (isothermal)
That part of the total enthalpy not available is called In this case:
the ‘anergy’.
pv =constant
Anergy d, = To@, -So)
3.2.9 Reversible non-flow processes

Constant volume (s2 -sl)= R In e) In (:)
R
=
In this case:
F 7
P
-=constant 1 T5C 2
T \
pv=c
(st -sl)=c,In (2) V S

Isothermal process

Constant entropy (isentropic)
In this case:

C
pvY=constant, where y =2
CV
PlVl -P2V2
W=
Constant-volume pmceSS
Y-1
Q=O
Constant pressure (s2 -SI) = 0
Also:

Constant-entropy pmcess

Polytropic process
In this case:
Constant-pressure pr0cB.s pv” =constant, where n = any index