I understand this problem for the most part, but I don\'t understand why the eflow is incorrect (all other answers are correct). I used e= U+Ke+0, with U being equal to ug= 1084.984 btu/lbm.Could someone explain what I did wrong? Thanks Steam is leaving a pressure cooker whose operating pressure is 30 psia. It is observed that the amount of liquid in the cooker has decreased by 0.45 gal in 60 minutes after the steady operating conditions are established, and the cross-sectional area of the exit opening is 0.15 in 2. Determine the mass flow rate of the steam and the exit velocity, the total and flow energies of the steam per unit mass, and the rate at which energy is leaving the cooker by steam. Solution eflow= PV= h-u= 1164.1-1087.8= 76.3 .

1. I understand this problem for the most part, but I don't understand why the eflow is incorrect (all
other answers are correct). I used e= U+Ke+0, with U being equal to ug= 1084.984
btu/lbm.Could someone explain what I did wrong?
Thanks
Steam is leaving a pressure cooker whose operating pressure is 30 psia. It is observed that the
amount of liquid in the cooker has decreased by 0.45 gal in 60 minutes after the steady operating
conditions are established, and the cross-sectional area of the exit opening is 0.15 in 2.
Determine the mass flow rate of the steam and the exit velocity, the total and flow energies of the
steam per unit mass, and the rate at which energy is leaving the cooker by steam.
Solution
eflow= PV= h-u= 1164.1-1087.8= 76.3