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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 & & & & + + + + + =
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
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 Sources of Data - 3 CD accompanying book (and similar data bases) advantage
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2 - Calculating Enthalpy Changes_S10 - Calculating Changes...

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