(a) 3.8 lbm (b) 113.089 °F (c) 0.213 Btu/R; 9.125ºF iPad 11:49 PM 90%- 11 of 11
ID: 1718669 • Letter: #
Question
(a) 3.8 lbm
(b) 113.089 °F
(c) 0.213 Btu/R; 9.125ºF
iPad 11:49 PM 90%- 11 of 11 Lecture # 17-Homework Problema #2-Due before class on 2/29/16 Water is flowing into and out of a tank containing a piston-cylinder assembly. A total of 7.2 lbm enters via the only inlet at a temperature of 52°F. Mass equaling 3.4 lbm flows out of one of the two exits, that both exit at a temperature of 81°F. During this constant mass control volume process, the pressure is maintained throughout the system at a uniform value of 14.696 lbfin. The piston performs 62 Btu of work on the mixture, and 432 Btu of heat transfer enters via the surroundings maintained at 150°F Determine: a) b) The mass in [lbm] exiting the second exit; note, the mass initially in the tank is equal to 5 lbm. The temperature in [°Fl of the water in the tank at the end of the process if it is initially at a temperature of 56°F; note, the entropy of the water at this state is eu to 0.1527 Btu (lbmR). This value is not needed to solve part (b) c) The entropy generation during this process in [Btu/R] if the mass initially in the tank has an entropy of 0.04781 Btu/(bm-R), the entropy entering is 0.04 Btu/(lbm-R), and the entropy exiting is 0.09516 Btu/(lbm-R). Can this process happen or not? What would be the minimum temperature required for this process to happen in [°F]. Does this value make sense? Show all calculations and unit conversions in order to receive full points.Explanation / Answer
c
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