6-67 6-90 An adiabatic open feedwater heater mixes steam with feedwater. The outlet mass flow rate and the outlet velocity are to be determined. Assumptions Steady operating conditions exist. Properties From a mass balance m 3 m 1 m 2 0.2 10 10.2 kg/s The specific volume at the exit is (Table A-4) P3 T3 100 kPa ½ ¾ v 3 # v f @ 60qC 60qC ¿ m 3v 3 A3 2 0.001017 m 3 /kg The exit velocity is then V3 Water 100 kPa 50qC 10 kg/s 4m 3v 3 3 Steam 100 kPa 160qC 0.2 kg/s 1 100 kPa 60qC SD 2 4(10.2 kg/s)(0.001017 m 3 /kg) S (0.03 m) 2 14.68 m/s PROPRIETARY MATERIAL. © 2008 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.

Download
# 6-67 outlet velocity are to be determined. Water