A list of common unit operations follows: (a) Single-pipe heat exchanger; (b) 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

Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg