TH10Ch05 - FIRST LAW IN OPEN SYSTEMS Steady Flow Energy...

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() same the be must ms energy ter the all of units the ) 36 5 ( W ) 2 V (h m Q W gz) 2 V pv (u m Q W ) gz 2 V v p (u m ) gz 2 V v p (u m Q gz 2 V u(T) PE KE u(T) E v p m v p m W W W W W v p m V p V V p pdV W Law First W E Q shaft 2 shaft 2 shaft 1 2 1 1 1 1 1 2 2 2 2 2 2 2 2 1 1 shaft out flow in flow shaft 1 1 1 1 final 1 initial 1 1 in flow + + + = + + + + × = + + + + × + + + × = + + = + + = + = + + = = = = = + = gz FIRST LAW IN OPEN SYSTEMS Steady Flow Energy Equation Open, steady flow thermodynamic system - a region in space Q shaft W p 1 v 2 1 V 2 V 1 z 2 z p 2
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Steady Flow Processes Devices Equation Energy Flow Steady W gz) 2 V (h m Q shaft 2 + + + = Turbine, Compressor, Pump () out in h h m W = = = = h m H W 0 Q Elevation, Velocity, out in h h m Q = = = = h m H Q 0 Work 0, Elevation 0, Velocity Boiler, Condenser, Heat Exchanger Diffuser, Nozzle Valve - throttling process out in h h = = = = = = = out in H H 0 H 0 W 0, Q 0, Elevation 0, Velocity 2 V h 2 V h 2 2 2 2 1 1 + = + = = 0 W 0, Q 0, Elevation
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2 measured be can quality 100% to 87% .87, x kJ/kg 2039.4 kJ/kg 732.22 kJ/kg 2506.1 h h h x kJ/kg 2039.4 h kJ/kg 732.22 h kPa @850 kJ/kg 2506.1 quality mesurable @maximum h kPa 100. @P h h ) P (T h h 0 Q 0, W 0, PE 0, KE W h) 2g V (h Q Equation Energy Flow Steady system odynamic open therm device? with this meaaured be can quality steam kPa 850 of range What 1fg 1f 2 fg v 2 barometer g 2 barometer 2, 2 1 shaft 2 = = = = = = = = = = = = = + + + = z T 1 100 kPa 850 kPa 1 2 v
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C z O 7 53.9 T 29%quality .29, 2373.1 225.94 925.98 x kJ/kg 2373.1 h kJ/kg, 225.94 h kPa 15 at kJ/kg 924.98 h h kg 700 kJ/kg 2373.1 kg 200 kJ/kg 251.13 kg 500 kJ/kg 2373.1 C @60 h h kJ/kg 251.13 C @60 h h h m h m h m constant mh 0, PE 0, KE 0, W 0, Q W h) 2g V (h m Q Equation Energy Flow Steady kg/sec 200 kg/sec 500 m m m m Balance Mass system odynamic open therm ? conditions exit the are What 15kPa. of pressure a at tank a in steam saturated C 60 kg/sec 200 with mixed is water C 60 of kg/sec 500 g f c c O v b O f a c c b b a a shaft 2 c b a c O O = = = = = = × = × + × = = = = = + = = = = = + + + = + = + = water 60 kg/sec 500 O steam 60 kg/sec 200 O a b kPa 15 c
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4.233 An adiabatic air compressor is to be powered by a direct coupled adiabatic steam turbine that is also driving a generator. Steam enters the turbine at 12.5 MPa and 500 C at a
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This note was uploaded on 07/08/2011 for the course MAE 204 taught by Professor Errington during the Summer '08 term at SUNY Buffalo.

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TH10Ch05 - FIRST LAW IN OPEN SYSTEMS Steady Flow Energy...

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