Problem

A distillation unit is to be used to generate pure water vapor. 5.0 lbm/s of liquid water...

A distillation unit is to be used to generate pure water vapor. 5.0 lbm/s of liquid water at 100°F enters the system, and 1.0 lbm/s of saturated water vapor leaves through one port and 4.0 lbm/s of saturated liquid leaves through a second port (along with impurities in the water that can be neglected in the analysis). The pressure throughout the whole system is 20 psia. A stirring system is used, which is powered by a 0.4 hp motor—assume that all of the motor’s work enters the system. All other energy is added through heat transfer.

(a) Determine the rate of heat transfer needed to produce this flow of saturated water vapor.


(b) Using your separation chamber model, plot the heat transfer rates needed to produce saturated water vapor flow rates between 0.5 lbm/s and 4.0 lbm/s (along with corresponding changes to the saturated liquid water exit flow rates).

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