Reverse osmosis is used to produce pure water from sea water that has a salt concentration of 35,000 ppm and an osmotic pressure of 10 lb in 2 per 1 000 ppm The inlet pressure is 900 lb in 2 gauge, and 40 percent of the feed is recovered as potable water (a) If the feed pump efficiency is 80 percen...

To calculate the thermodynamic efficiency of the reverse osmosis process we need to consider both the pump and the turbine work as well as the work do ...

Reverse osmosis is used to produce pure water from sea water that has a salt concentration of

Question:

Reverse osmosis is used to produce pure water from sea water that has a salt concentration of 35,000 ppm and an osmotic pressure of 10 lb_ƒ/in.² per 1.000 ppm. The inlet pressure is 900 lb_ƒ/in.² gauge, and 40 percent of the feed is recovered as potable water.

(a) If the feed pump efficiency is 80 percent and only the pump work is considered, what is the thermodynamic efficiency of the process?

(b) If the spent brine is discharged through a turbine with 85 percent efficiency, what is the thermodynamic efficiency?

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