By Victor J. Law
"Preface This publication has been written utilizing notes constructed for the direction Numerical tools for Chemical Engineers at Tulane college. the writer has written past textbooks; one on FORTRAN programming and one utilizing the language Pascal. On a private notice, whilst I accomplished the Pascal publication I requested my spouse to wreck my arms if I ever determined to put in writing one other e-book! good, that was once decades in the past and having Read more...
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Extra info for Numerical methods for chemical engineers using Excel, VBA, and MATLAB
Example text
A modification to overcome stagnation is to detect when it occurs and to take action to avoid it. An effective modification is to simply halve the stagnated f(x) value in the update formula. While the modified false position method can be implemented directly in Excel, the logic required is sufficiently complex to make using VBA a better choice. 2) Specification It is necessary to place on the spreadsheet user interface the two initial values of x that bracket the root. If the initial values do not bracket the root, the program should terminate with an error message.
The second line that involves the word Offset is a command to move the cursor down one row but in the same column (1,0). 11 12 Numerical Methods for Chemical Engineers Using Excel®, VBA, and MATLAB® This code can be altered so that, when invoked, it repeats over and over until the next item in the f(x) column is blank (which also represents a value of 0). The edited code appears below, where the additional code is shaded for emphasis: Details concerning the VBA language are covered in Chapter 2.
1. Prepare an Excel spreadsheet that calculates for a mixture the bubble point at pressures of 15, 16, …, 25 atm and produces a plot of the bubble point versus pressure with suitable annotations and title. Use Goal Seek to solve the single nonlinear equation at each pressure. 4. Prepare a Keystroke Macro to find the bubble point at each pressure. That is, record the macro and edit it using a While statement so that one keystroke finds all bubble points. 2. Prepare an Excel spreadsheet that is similar to the one for the bubble point, but is used to compute the dew point of the same mixture at the same pressures.