Page 100 - Coulson Richardson's Chemical Engineering Vol.6 Chemical Engineering Design 4th Edition

FUNDAMENTALS OF ENERGY BALANCES
480 K p = 10 83
H′ = 6500
2
p = 1
460 K
H = 6200
2
Enthalpy Actual path
Isentropic
path 290 K
= 4500
H 1
Entropy

Figure 3.5. Mollier diagram, methane

90

Axial - flow
80
Efficiency, Ep, % 70 Centrifugal

60
1.0 10 100
3
Volumetric flow rate (suction conditions), m /s
Figure 3.6. Approximate polytropic efficiencies centrifugal and axial-flow compressors

For an isentropic efficiency of 0.85:
1700
Actual work done on gas D D 2000 cal/mol
0.85
So, actual final enthalpy

0
H D H 1 C 2000 D 6500 cal/mol
2