SPSolution20-21

# SPSolution20-21 - Naik Sameer V Solution for Special...

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Naik, Sameer V. Fall 2009 1000 Solution for Special Problem 20 Given: - Insulated mixing chamber to heat liquid water Find: - Mass flow rate (kg/min) of steam - Velocity (m/s) of water at the exit of the mixing chamber System: Assumptions: - Steady state steady flow - Insulated no heat transfer - No work interaction - Negligible changes in kinetic and potential energy Basic Equation(s): .. . . . 12 3 0 CV ie inlets exits dm mm m m m dt ⎛⎞ =−⇒ = + ⎜⎟ ⎝⎠ ∑∑ 22 . . . 11 2 2 33 0 CV i e CV i i e e CV inlets exits dE Q W m h gz m h gz dt mh mh mh ∀∀ =−+ + + + + ⇒= + . mA ρ =∀

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Naik, Sameer V. Fall 2009 1000 Solution: (a) At inlet 1, P 1 = 3 bar ( T sat = 133.6 ° C) T 1 = 20 ° C < T sat sub-cooled (compressed liquid). We can approximate the enthalpy at inlet 1 as: () () () [] 3 3 11 1 1 1 kJ m 83.96 1.0018 10 300 2.339 kPa kg kg ff s a t hhT vTPPT ⎡⎤ =+ = ⎣⎦ , i.e., 1 kJ 84.26 kg h = . At inlet 2, P 2 = 3 bar ( T sat = 133.6 ° C) T 2 = 320 ° C > T sat superheated vapor. Using Table A-4, 2 kJ 3110.1 kg h = . At the exit 3, P 3 = 3 bar ( T sat = 133.6 ° C) T 3 = 90 ° C < T sat sub-cooled (compressed liquid).
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## This note was uploaded on 05/15/2010 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue.

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SPSolution20-21 - Naik Sameer V Solution for Special...

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