Use the Critical Pressure value above, ORĮnter a Critical Pressure obtained elsewhereįor the Redlich-Kwong Equation of State (used to calculate the compressibility factor, Z) see: (This is the Critical Temperature that will be used to calculate compressibility factor.)Ĭritical Pressure from above menu selection:Ībove, then the yellow cell, D50, below must be blank. Use the Critical Temperature value above, ORĮnter a Critical Temperature obtained elsewhere NOTE: If you want to use a gas from the menuĪbove, then the yellow cell, D35, below must be blank. The entered values for T and P above are ok.Įxcel Vlookup results based on selected fluid:Ĭritical Temperature from above menu selection: Table 2-13.2 in Perry's Chemical Engineers' Handbook, 9th Ed.
#Polymath software gives constant pressure Pc
The source for the Tc and Pc values in this table is: That is: P/Pc < T/(2Tc)įor accurate results P and T values should be such that P/Pc < T/(2Tc).Ĭheck on Gas Temperature and Gas Pressure Values entered above: Note that the final calculation check made at the left using the more familiar second form of the Redlich-KwongĮquation uses the value of Z calculated with the third form of the equation, so if the calculated value of Z is theĬalculation of Gas Compressibility Factor – S.I. If C < 0, then there are three real roots, given by: Zk = 2(-f/3)1/2cos + 1/3, k = 1,2,3 The gas compressibility factor is calculated with the Redlich-Kwong Equation For either a gas selected from the dropdown list or user entered gas properties, The gas temperature and pressure must beĮntered in the yellow cells, D14 and D15.ģ. Those user entered property values will be used for calculation of Values for the gas critical temperature and critical pressure in the indicated yellow For calculations with some other gas, not listed in the table below, the user must enter (ii) enter those parameters in the yellow cells D35, & D50, and those values will be used.Ģ. Shown below on this worksheet and those values will be used for calculation of theĮither (i) select a Gas and enter its temperature and pressure in the indicated yellow cellsīelow, so that its critical temperature and critical pressure will be obtained and used, or else, The gas critical temperature and critical pressure will be Gas from the dropdown list in cell D12 and enter the gas temperature and pressure in For calculations with one of the 21 gases listed in the table below, select the appropriateĬalculation of Gas Compressibility Factor – U.S. The worksheet checks on this requirementĪnd advises changing either P or T if the requirement is not met.ġ. For accurate calculation of the compressibility factor with the Redlich-KwongĮquation, the reduced pressure should be less than half of the reduced
User specified temperature and pressure, using the Redlich-Kwong equation.ģ. The worksheet will calculate the compressibility factor of the gas at the Must enter the temperature and pressure of the gas.Ĭopyright © McGraw-Hill Global Education Holdings, LLC. The critical temperature and critical pressure of a gas. To either select a gas from a dropdown menu list of 21 gases or else enter Each of the compressibility factor calculator worksheets allows the user However, adjust the number of decimal places for any of the cells. Possibility of inadvertently typing over any of the formulas. NOTE: The cells containing formulas are locked (protected) to avoid the UnitsĬlick on tabs at the bottom of the screen to access the following: Intro-Start Here Compressibility Factor Calculator – Choice of U.S.
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