Index to Figures and Charts 1021 Generalized compressibility o s 10.0 Generalize

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Index to Figures and Charts 1021 Generalized compressibility o s 10.0 Generalized compressibility chart, pr pe Generalized compressibility chart, 10 1023 1022 gure A-1 1022 Figure A-2 Figure A-3 Generalized en halpy correction chart Figure A-4 Generalized entropy correction chart 1024 Generalized fugacity coefficient chart 10zs 1026 diagram for water SI units units) Temperature-entropy diagram for water (English 1028 Figure A-s gure A 1027 Figure A-7 Figure A-7E Enthalpy-entropy diagram for water (SI units) Enthalpy-entropy diagram for water (English units) 1029 Figure A-8 Figure A-8E Psychrometric chart for 1 atm (SI units) 1030 Figure A-9 Psychrometric chart for 1 atm (English units) 1031 103 Pressure enthalpy diagram for carbon dioxide (SI units) Figure A-9E 1033 Figure A carbon dioxide (English units) Figure A-10E diagram for Pressure-enthalpy diagram for Refrigerant 410A (SI units) Pressure-enthalpy diagram for Refrigerant 410A (English units) 1035 Figu Figure A 5.00 13 080 0.90 0.70 0.95 e 0.60 o 0.50 0.40 0.30 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Reduced pressure, pR Figure A-1 Generalized compressibility chart, p s 1.o. Source: E. F. obert, Concepts of Thermodynamics, McGraw-Hill, New York, 1960 1021

Explanation / Answer

Ideal gas law is Pv = RT

or Z = Pv/RT = 1

We need to be within 10% limits of the ideal gas law. Hence, Z can be between 0.9 and 1.1.

Also, it is given that Tr > 1.0

We note from the graph that the line of Z = 0.9 intersects the Tr = 1.0 curve at Pr = 0.3

For the upper limit of Z = 1.1, we don't need to worry as that is out of the bounds of the chart.

Hence, the lower limit of pressure is Pr < 0.3 for ideal gas approximations.

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