Unformatted text preview: 3 /g. What are Δ H and Δ U (per weight) ? 4. (8 points, This problem was on the 2010 Midterm 1) We have a ﬂow system with three inlets and one outlet. The gases we are using have c P ( A ) = 1 . 78 kJ kg K and c P ( B ) = 2 . 38 kJ kg K . In inlets 1 and 2 gas A enters with 1 kg/min each, in inlet 3 gas B enters with 2 kg/min. (Steady state) (a) What is the ﬂow rate in the outlet. (b) Assume only inlets 1 and 2 are open and the gases enter with 340 K in inlet 1 and 360 K in inlet 2 what is the outlet temperature? (c) Inlet 3 is opened and the gas enters with 333 K (rest as in part b), what is now the outlet temperature? (d) In the system of part c we have now heat loss of . Q = 1 . 6 kW and we add stirring to improve mixing with . W = 750 W. What is now the outlet temperature?...
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 Fall '09
 Faller
 Thermodynamics, 1 kg, 2 kg, 34 kJ, 360 K, 340 K

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