Does the problem involve a special topic?

Generic open steady systems include a wide range of practical devices such as nozzles, diffusers, compressors, pumps, turbines, expansions valves, boilers, evaporators, condensers, heat exchangers, mixing devices, separators, etc. Animations in VT, section 4.A-C, illustrate such systems.

Analysis of generic open systems are generally carried out in the first half of most thermodynamics textbooks.

Special topics such as combustion, psychrometry, vapor and gas power cycles, vapor and gas refrigeration cycles, and gas dynamics are handled in this branch.

Analysis of specific open systems are carried out in the second half of most thermodynamics textbooks.
Open-Steady System and Its Governing Balance Equations
System 
Animation of an open steady system having all possible interactions with its surroundings. The image of the system does not change with time, indicating its steady-state status.
Balance Equations  Read Chapter-3: Thermodynamics - A Problem Solving Approach by Bhattacharjee
Copyright 1998-:  Subrata Bhattacharjee