engr2010-f11-hw06 - ENGR 2010 Thermodynamics I HW Set 6 Due...

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ENGR 2010 Thermodynamics I: HW Set 6, Due Thursday 10/6 The next topic in SSSF CV analysis will deal with devices that have multiple inlets and/or outlets: Sec. 4 in chapter 5 of the text. Mass conservation for such devices states that the net mass flow rate into the CV will equal the net mass flow out. Say the CV has N inlets and M outlets, then N inlets ˙ m i,in = M outlets ˙ m i,out Neglecting KE and PE, the first law for this device will appear as ˙ Q - ˙ W = M outlets ˙ m i,out h i,out - N inlets ˙ m i,in h i,in The common devices in this category are mixing chambers and two fluid heat exchangers . 1 2 3 1h 2c 2h 1c mixing chamber two fluid heat exchanger A mixing chamber typically takes two streams and mixes them together. The device, as a whole, can be considered adiabatic. There is no CV work, and ki- netic energies can be neglected. The entire device is also typically taken to operate at a constant pressure, so that P 1 = P 2 = P 3 . Mass conservation has ˙ m 3 = ˙ m 1 + ˙ m 2
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