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SOL4-2011

# SOL4-2011 - ECH 152A Fall 2011 Roland Faller Solutions for...

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ECH 152A, Fall 2011, Roland Faller Solutions for Homework 4, October 19, 2011 Problem 1 (From Midterm 2010) (a) What is the deﬁnition of enthalpy? (b) What is the diﬀerence between steady state and equilibrium?. (c) Which of these are state functions: Heat, Pressure, Enthalpy, Temperature? (d) Deﬁne ”ideal gas”. Solution (a) H = U + pV (b) In equilibrium there are now ﬂows, no time dependencies and no driving forces. In steady state driving forces and ﬂows are constant. (c) p,H,T (d) A gas fulﬁlling the equation pV = NRT Problem 2 (From 2010) 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 . Use steady state in all cases below. In inlets 1 and 2 gas A enters with 1 kg/min each, in inlet 3 gas B enters with 2 kg/min. (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

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SOL4-2011 - ECH 152A Fall 2011 Roland Faller Solutions for...

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