TH10Ch07 - The Second Law implies: T Q T Q T Q Cycle Gas...

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Unformatted text preview: The Second Law implies: T Q T Q T Q Cycle Gas Ideal an For 4) T Q T Q T Q cycle a For 3) T Q T Q Scale e Temperatur Absolute 2) T T T Q Q Q Q W Engine Heat 1) L L H H L L H H L L H H H L H H L H in = = = = = = = = H H T , Q W L L T , Q L Q H Q T s = = processes reversible T dQ T Q Clasius Inequality T Q T Q T Q T T 1 Q Q 1 T T T Q Q Q Cycle Reversible a for l l h h h l h l h l h h l h = = = = T Q T Q T Q T Q T T 1 Q Q 1 T T T Q Q Q Cycle le Irreversib an for l l h h h l h l h l h h l h Entropy Definition and Change S T Q , Tds Q T Q ds T Q ds T Q ds ds T Q ENTROPY S, PROPERTY, A DEFINE S S T Q T Q T Q T Q process le irreversib an and reversible a of composed cycle a for Inequality Clasius T Q rev irrev 1 irrev 2 1 irrev 2 1 2 1 irrev 2 2 rev 1 1 irrev 2 = = = + + + = 1 2 reversible irreversible S , systems le irreversiv For S systems, reversible For system isolated an for S, Change, Entropy Total > = Liquid water enters an open feel water heater at .8 MPa and 35 C and steam enters at .8 MPa and 350 C. The leaving stream is saturated liquid at pressure of .8 MPa. Determine the ratio off the mass flow rates of the water and steam. Determine the rate at which entropy is produced in the feed water heater. ( ) ( ) ( ) ( ) K kJ/kg .2258 S 1.2473-1.0215 S .5051 2.0457 .8096 7.4107 2.0457 .1904 S s s m s s m S 1kg m .235 m m .1904, m m 1 m m .8096, m m 3162.2 146.64 3162.2 720.87 h h h h m m h h m m h m m 1 h h m m h m m Balance Energy h m h m h m 1 m m m m Balance Mass m m m 1 point state @ 2 3 2 1 3 1 3 2 1 3 2 3 1 3 2 1 2 1 3 3 2 3 2 3 2 1 3 2 3 2 3 2 1 3 1 3 3 2 2 1 1 3 2 3 1 3 2 1 = + = + = + = = = = = = = = = + = + = + = + = + 4107 . 7 s 2 . 3162 h C 350 MPa, .8 1 1 1 = = K kJ/kg .5051 s C 35 @ s s kJ/kg 146.64 h C 35 @ h h C 35 MPa .8 2 2 f 2 2 f 2 = = = = kJ/kgK 0457 . 2 s MPa .8 @ s s kJ/kg 20.87 7 h MPa .8 @ h h MPa .8 p 3 3 f 3 3 f 3 = = = = = T 1 2 3 K kJ/kg .2258 S = PS5.2 s 1 T 3 3 2 s) (m S, 1.0215 1.12473 Completely Reversible Process- System and surroundings returned to the original state Internally Reversible- System returned to the original state. Externally Reversible- Surroundings returned to the original state. Temperature Entropy Property Diagrams s T Tds Q T Q ds const = = = ( ) s T T Q Q W L H out in net = = Temperature Entropy Property Diagrams Water Entropy Change of an Ideal Gas + = = = = = = = +...
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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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TH10Ch07 - The Second Law implies: T Q T Q T Q Cycle Gas...

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