CHAPTER 3 SMITH AND VAN NESSCHE123 CPMONTEROLA
Variation of volume with temperature and pressure
IF EFFICIENCY IS 80%
IF EFFICIENCY IS 80%
THE THROTTLING PROCESS
REFRIGERATOR THERMO
CAR AIRCON SYSTEM
H(P,T)
ISENTHALPIC PROCESS(CONSTANT H)
JOULE-THOMSON COEFFICIENT, U
JOULE-THOMSON COEFFICIENT
2.30(a) When a certain freon used in refrigeration was expanded adiabatically from an initial pressure of 32 atm and 0°C to a final pressure of 1.00 atm, the temperature fell by 22 K. Calculate the Joule–Thomson coefficient, μ, at 0°C, assuming it remains constant over this temperature range.
ISENTHALPIC PROCESS(CONSTANT H)
2.45‡ Concerns over the harmful effects of chlorofluorocarbons on stratospheric ozone have motivated a search for new refrigerants. One such alternative is 2,2-dichloro-1,1,1-trifluoroethane (refrigerant 123). Younglove and McLinden published a compendium of thermophysical properties of this substance (J. Phys. Chem. Ref. Data 23, 7 (1994)), from which properties such as the Joule–Thomson coefficient μ can be computed. (a) Compute μ at 1.00 bar and 50°C given that (∂H/∂p)T = −3.29 × 103 J MPa−1 mol−1 and Cp,m = 110.0 J K−1 mol−1. (b) Compute the temperature change that would accompany adiabatic expansion of 2.0 mol of this refrigerant from 1.5 bar to 0.5 bar at 50°C.
ASPEN HYSYS FLUID PACKAGES/EOS
B’ and C’ are chemical species dependent.
COMPRESSIBILITY FACTOR, Z
ISOTHERMS OF METHANE
VIRIAL EQUATION OF STATE
VIRIAL EQUATION OF STATE
BENEDICT WEBB ROBIN EOS
REDLICH-KWONG EQUATION
THE CORRESPONDING STATE THEORY
THE ACENTRIC FACTOR, OMEGA
• ω
GENERALIZED COMPRESSIBILITY FACTOR CORRELATIONLEE-KESLER CORRELATION
Z0 and Z1 are functions of Tr and Pr.
Tables for interpolation are found in appendix E of Smith and Van Ness.
ω is in appendix C of the same book.
PERRY PAGE 2-502 LEE-KESLER
3.10
APPENDIX B VAN NESS
PITZER CORRELATION
PERRY PAGE 4-10
PERRY PAGE 4-9
3.10
THIRD VIRIAL COEFFICIENT, C HAT PERRY PAGE 4-10
THIRD VIRIAL COEFFICIENT, C HAT PERRY PAGE 4-11
3.10
REDLICH-KWONG EOS PERRY PAGE 4-11
RK
PENG ROBINSON EOS
PERRY PAGE 4-11
PENG-ROBINSON EOS
8. (10 pts) You are asked to design a steel tank in which CO2 will be stored at 290 K. the tank is 10.4 m3 in volume and you want to store 460 kg of CO2 in it. What pressure will the CO2 exert? Use Peng-Robinson equation to get your answer.
LOOKING FOR PRESSURE USING B HAT
RK EQUATION
ASPEN HYSYS FLUID PACKAGES/EOS
REFRIGERATOR’S EXPANSION VALVE