ChemE 260 Phase Equilibrium and Thermodynamic Data Tables

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

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

Single Interpolation Baratuci ChemE 260 April 1, 2005

Double Interpolation Baratuci ChemE 260 April 1, 2005

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

Humidity and Saturation Baratuci ChemE 260 April 1, 2005

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

Example #1 • Specific Volume of Saturated Mixtures • Calculate the specific volume for the following situations: • Water at 200oC and 80% quality • Freon 12 at -60oC and 90% quality • Ammonia at 500 kPa and 85% quality • Ans.: V = 0.1022 m3/kg • Ans.: V = 0.57476 m3/kg • Ans.: V = 0.21435 m3/kg Baratuci ChemE 260 March 29, 2005

Example #2 • The temperature of 10 lbm of water is held constant at 205oF. The pressure is reduced from a very high value until vaporization is complete. Determine the final volume of the steam in ft3. • Ans.: Vfinal = 307 ft3 Baratuci ChemE 260 March 29, 2005

Example #3 • R-134a is contained in a sealed glass vessel at 50oC. As it is cooled, droplets are noted condensing on the sidewalls at 20oC. Find the original pressure in the vessel. • Ans.: P1 = 658 kPa Baratuci ChemE 260 March 29, 2005

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 } oC • Ans.: V(5oC) = 0.009957 m3 • Ans.: V(200oC) = 0.011482 m3 • Ans.: V(400oC) = 0.26436 m3 • Ans.: V(800oC) = 0.48629 m3 • Ans.: V(1500oC) = N/A • Ans.: V(-10oC) = N/A Baratuci ChemE 260 March 29, 2005

Example #5 • Determine the missing property values in the table below for a system that contains pure H2O. Baratuci ChemE 260 March 29, 2005

Example #5 – Answers • Determine the missing property values in the table below for a system that contains pure H2O. Baratuci ChemE 260 March 29, 2005

Example #6 • A small rigid cylindrical vessel contains 1 kg of humid air at 80oC under a total pressure of 1 bar. The humid air inside the vessel contains 0.150 kg of water vapor. Determine the relative humidity of the air in the container. • Ans.: hr = 46.7% Baratuci ChemE 260 March 29, 2005

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 70oC. 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.: mH2O = 250 g H2O Baratuci ChemE 260 March 29, 2005

ChemE 260 Phase Equilibrium and Thermodynamic Data Tables