At steady state, 5 kg/s of saturated water vapor at p₁ = 1 bar enters a Direct Contact Heat Exchanger and mixes with 5 kg/s of liquid water entering at T₂ = 25C, p₂ = 1 bar. A two-phase liquidvapor mixture exits at p₃ = 1 bar. Neglect heat transfer with the surroundings and the effects of motion and gravity. Let T_o = 20C, p_o = 1 bar.

Determine the rate of exergy destruction, in kW.

Determine the exergetic efficiency.