4.85 For the desuperheater shown in Fig. P4.85, liquid water at state 1 is injected into a stream of superheated vapor entering at state 2. As a result, saturated vapor exits at state 3. Data for steady state operation are shown on the figure. Ignoring stray heat transfer and kinetic and potential energy effects, determine the mass flow rate of the incoming superheated vapor, in kg/min. Liquid, + T = 20C P = 0.3 MPa m = 6.37 kg/min 2 ZD! + Superheated vapor T = 200C P2 = 0.3 MPa Fig. P4.85 Desuperheater 3 + Saturated vapor P3 = 0.3 MPa