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