A list of common unit operations follows:
(a) Single-pipe heat exchanger;
(6) Double-pipe heat exchanger;
(c) Pump;
(d) Gas compressor:
(e) Gas turbine (expander) ;
(f) Throttle valve:
(g) Nozzle.
Develop a simplified form of the general steady-state entropy balance appropriate to each operation. State carefully, and justify, any assumptions you make.