An open feedwater heater is a direct-contact heat exchanger used in vapor power plants. Shown in Fig. P6.88 are operating data for an open feedwater heater with H ₂ O as the working fluid operating at steady state. Ignoring stray heat transfer from the outside of the heat exchanger to its surroundings and kinetic and potential energy effects, determine the rate of entropy production, in kW/K.

P3 = 3 bar Saturated liquid m3 = 80 kg/s 3 P2 = 3 bar x = 0.92 -2 Open feedwater heater P = 3 bar T = 36C 1