2 - Calculating Enthalpy Changes_S10

2 - Calculating Enthalpy Changes_S10 - Calculating Changes...

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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Calculating Changes of Enthalpy, Internal Energy, Volume For a Process of Interest ChE 202 Spring 2010
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Calculating Changes of Enthalpy, Internal Energy, Volume V U H ˆ , ˆ , ˆ sys U ˆ Why do I care? So we can use these in (MB,) EB: -- (v sys 2 )/2 + g z sys + = Q (in) /m sys –W s (by) /m sys –P ext sys V ˆ etc by s W in Q out i m i p E i k E i H in i m i p E i k E i H ) ( ) ( ) , ˆ , ˆ ˆ ( ) , ˆ , ˆ ˆ ( 0 + + + + + =
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Calculating Changes of Enthalpy, Internal Energy, Volume - 2 V U H ˆ , ˆ , ˆ For V(T,P), Can calculate absolute value, or can use data sources For H and U, Can calculate M = M(T 2 ,P 2 ) – M(T 1 , P 1 ) Or can use data sources Value of H(T,P) read off is actually H(T,P) – H(T ref , P ref ) Make sure different data sources have the same reference states Get U from H = U + PV Data sources first, then calculations
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Sources of Data ± Steam tables/other tables ± advantages ± much data, wide range of conditions ± disadvantage ± specific species (e.g., water) ± need for interpolation ± Diagrams (like P – H diagrams) ± advantage ± good for quick calculations ± disadvantage ± not accurate
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Sources of Data - 2 ± Perry’s Handbook – the ChE data “bible” ± It also contains instructional material ± We have hard copies, and PDF version is on all computers ± advantage ± it contains most ChE information ever needed ± disadvantage ± sometimes hard to find what you want until you know your way around it
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz
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This note was uploaded on 05/14/2010 for the course CHE 102 taught by Professor Dadyburjor during the Spring '10 term at WVU.

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2 - Calculating Enthalpy Changes_S10 - Calculating Changes...

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