Page 395 - Compression Machinery for Oil and Gas

372 SECTION II Types of Equipment

0
P
Upstream
0 of the IGV
Temperature Entropy
Pressure

P
5 5s 5a
5h Downstream
of the diffuser

Enthalpy
FIG. 7.56 Isentropic expansion process (0–5s), actual expansion process (0–5a), and isenthalpic
expansion process (0–5h).

This definition of turboexpander efficiency may be used to determine how
efficiently the fluid energy at the inlet nozzle is extracted by the expander to
achieve cooler fluid at the expander exit.

References
[1] C.B. Meher-Homji, M. Chaker, A.F. Bromley, The Fouling of Axial Flow Compressors:
Causes, Effects, Susceptibility, and Sensitivity, ASME, in: Turbo Expo: Power for Land,
Sea, and Air, Volume 4: Cycle Innovations; Industrial and Cogeneration; Manufacturing Mate-
rials and Metallurgy; Marine, 571–590. https://doi.org/10.1115/GT2009-59239.
[2] Guideline and Recommended Practice for Control of Torsional Vibrations in Direct-Driven
Separable Reciprocating Compressors, GMRC, 2015.