lecture11

lecture11 - 9/16/2010 PropertyTables ME200 ThermodynamicsI...

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9/16/2010 1 Property Tables ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – timothee@purdue.edu Lecture 10 September 14 th , 2010 Last Lecture •De f ined enthalpy Neglecting the heat capacity of the calorimeter: Ǫ reaction = – Ǫ solution Ǫ solution = m c Δ T Where: Ǫ = heat (joule) m = solution mass (g) c = the specific heat of solution (J/g C) Δ T = Tfinal – Tinitial = the change in temperature ( C or K) ME 200 2 •S t a r ted discussion on property tables: •D e f i n e quality (ratio of mass vapor to total mixture mass) o l v e d three examples with use of property table
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9/16/2010 2 •Mo re on Property Tables •L inea r interpolation • Several more examples Today and next lecture ME 200 3 • Determine what is the state of the substance (CL, SL, SLVM SV SHV) Property Tables • Think about what independent intensive properties are available (recall state postulate) • Select appropriate table (if not, need to implement suitable approximation) ME 200 4 •Ma ke sure that you look up properties with consistent reference states–otherwise the analysis will be wrong!
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9/16/2010 3 • Assumes any two data points connected by straight line (set slopes equal to find missing value) Linear interpolation ME 200 5 Given : The average atmospheric pressure in Denver (elevation = 1610 m) is 83.4 kPa Fi d Tt
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lecture11 - 9/16/2010 PropertyTables ME200 ThermodynamicsI...

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