ME300Lecture20

ME300Lecture20 - Lecture 20: Enthalpy Departure How to...

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20.1 Lecture 20: Enthalpy Departure How to evaluate properties of real fluids without tables? Enthalpy departure Where * denotes an ideal gas state. At fixed temperature, 22 11 Tp 2 1 p p v h h c dT v T dp T * * * * 2 1 2 2 2 1 1 1 p p h h h h h h h h v c dT v T dp T 2 1 p p v h h c dT v T dp T 1 * p0 lim h h 0
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20.2 Continue Enthalpy Departure Enthalpy departure: From Z = pv/RT, Using reduced properties: 2 p * 22 0 p v h h v T dp T pp v RZ RT Z T p p T 2 2 p * 0 p RT Z h h dp pT R R * p 2 R R 0 c R R p dp h h Z T RT T p R R * p 2 R R 0 RR c p dp h h Z T Tp RT
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20.3 Recall Let * * * * 2 1 2 2 2 1 1 1 * * * * 2 1 2 2 1 1 h h h h h h h h h h h h h h * h c hh Z RT ** 2 1 2 1 c h,2 h,1 2 1 2 1 c cc 21 Then h h h h RT Z Z h h h h or h h h h RT RT RT Continue Enthalpy Departure
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20.4 Continue Enthalpy Departure Generalized enthalpy correction chart
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20.5 Entropy Departure 22 11 * * * * 2 1 2 2 2 1 1 1 Tp p p s s s s s s s s c v dT dp TT p 21 p c v s s dT dp p ** c R s s dT dp
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20.6 Continue Entropy Departure Enthalpy departure: Because Similarly, entropy change can be evaluated from
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ME300Lecture20 - Lecture 20: Enthalpy Departure How to...

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