Saturated water vapor at 1 bar enters a direct-contact heat exchanger operating at steady state and
mixes with a stream of liquid water entering at 250C, 1 bar. A two-phase liquid-vapor mixture exits at 1 bar. The entering streams have equal mass flow rates. Neglecting heat transfer with the surroundings and the effects of motion and gravity, determine for the heat exchanger
a) The rate of exergy destruction, in kJ per kg of mixture exiting
.b) The exergetic efficiency given by equation : ε = (ṁ2 (e3 – e2)) / (ṁ1 (e1−e3))
Let T0 = 200 C, p0 = 1 bar.
