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ChemE 260 Phase Equilibrium and Thermodynamic Data Tables April 1, 2005 Dr. William Baratuci Senior Lecturer Chemical Engineering Department University of Washington TCD 2: C & D CB 2: 5+

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Thermodynamic Data Tables Four Tables in a Complete Thermodynamic Data Table –Saturation Temperature Table –Saturation Pressure Table –Subcooled Liquid Table –Superheated Vapor Table Cengel & Boles Outline –Steam Tables, SI & AE –R-134a, SI & AE –I will provide ammonia tables if and when you need them Thermo-CD –Steam Tables, SI & AE –R-134a Tables, SI & AE –Ammonia Tables, SI & AE Baratuci ChemE 260 April 1, 2005

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Single Interpolation Baratuci ChemE 260 April 1, 2005

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Double Interpolation Baratuci ChemE 260 April 1, 2005

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VLE Nomenclature Mole Fraction: Partial Pressure: Ideal Gases: Vapor Pressure: Condensable and non-Condensable Species Water / Air Evaporation: Boiling: Baratuci ChemE 260 April 1, 2005

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Humidity and Saturation Baratuci ChemE 260 April 1, 2005

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Next Class Equations of State –A relationship between P, V and T –Your favorite: IG EOS: PV = nRT –Many other better EOS’s exist –We will consider 5 others The Virial EOS The Van der Waals EOS The Redlich-Kwong EOS The Soave- Redlich-Kwong EOS The Compressibility Chart Graphical EOS Baratuci ChemE 260 April 1, 2005

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Example #1 Specific Volume of Saturated Mixtures –Calculate the specific volume for the following situations: Water at 200 o C and 80% quality Freon 12 at -60 o C and 90% quality Ammonia at 500 kPa and 85% quality Ans.: V = m 3 /kg Ans.: V = m 3 /kg Ans.: V = m 3 /kg Baratuci ChemE 260 March 29, 2005

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Example #2 The temperature of 10 lb m of water is held constant at 205 o F. The pressure is reduced from a very high value until vaporization is complete. Determine the final volume of the steam in ft 3. Ans.:V final = 307 ft 3 Baratuci ChemE 260 March 29, 2005

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Example #3 R-134a is contained in a sealed glass vessel at 50 o C. As it is cooled, droplets are noted condensing on the sidewalls at 20 o C. Find the original pressure in the vessel. Ans.: P 1 = 658 kPa Baratuci ChemE 260 March 29, 2005

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Example #4 Determine the volume occupied by 10 kg of water at a pressure of 10 MPa and the following temperatures: T = { 5, 200, 400, 800, 1500, -10 } o C Ans.: V(5 o C) = m 3 Ans.: V(200 o C) = m 3 Ans.: V(400 o C) = m 3 Ans.: V(800 o C) = m 3 Ans.: V(1500 o C) = N/A Ans.: V(-10 o C) = N/A Baratuci ChemE 260 March 29, 2005

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Example #5 Determine the missing property values in the table below for a system that contains pure H 2 O. Baratuci ChemE 260 March 29, 2005 T ( o C) P (kPa) V (m 3 /kg) U (kJ/kg) H (kJ/kg) X (kg vap/kg tot) a.) b.)244226

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Example #5 – Answers Determine the missing property values in the table below for a system that contains pure H 2 O. Baratuci ChemE 260 March 29, 2005 T ( o C) P (kPa) V (m 3 /kg) U (kJ/kg) H (kJ/kg) X (kg vap/kg tot) a.) b.) Superheated

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Example #6 A small rigid cylindrical vessel contains 1 kg of humid air at 80 o C under a total pressure of 1 bar. The humid air inside the vessel contains kg of water vapor. Determine the relative humidity of the air in the container. Ans.: h r = 46.7% Baratuci ChemE 260 March 29, 2005

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Example #7 An unknown amount of water and 5 kg of a non-condensable gas (Molecular Weight = 40) are produced in an industrial plant at a temperature of 70 o C. These products are sent to a rigid storage tank. The pressure and relative humidity in the tank are 2 atm and 65% respectively. Determine the mass of water present in the tank. Assume that the gas behaves as an ideal gas. Ans.: m H2O = 250 g H 2 O Baratuci ChemE 260 March 29, 2005

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