Estimation of Flammability Limits of Selected Fluorocarbons with F(sub 2) and CIF(sub3) Page: 56 of 78
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Exhibit B.2. Sample control file for ADIAB95.EXE
Ctrl T(K) P(bar) Xi(dil) Xi(ox) Xi(FC) System: N2-F2-114
0 1500 1.013 0.75 0.19 0.06
0 1500 1.013 0.70 0.24 0.06
0 1500 1.013 0.55 0.38 0.07
Upon running ADIAB95, the user will be asked for the names of the thermodynamics data file,
the control file, and a name for an output file. Following these questions, the program will run
through the cases specified. The output file contains the input parameters (pressure, starting
material quantities) and final temperature of each mixture successfully run. The file is a text file
structured in a format suitable for import into commercial spreadsheet programs, in "quote and
comma delimited," also known as "comma separated variable" format.
ADIAB95 is suitable for producing a list of adiabatic temperatures which can be compared with
the empirical threshold temperature formula applied to those compositions.to allows one to
determine if a large set of mixtures is predicted to be flammable. It does not, however, directly
seek points on the predicted flammability envelope. To automate this process, the program
FLAME4d.EXE was developed. Its operation is very similar to ADIAB95, but it actively seeks
compositions whose adiabatic temperatures match the threshold temperature function for that
mixture. The threshold function is an empirical fit of various fluorocarbon and
chlorofluorocarbon flammability limit data and is designed to predict the "ignition temperature"
as a function of composition. The program varies the starting quantity of one species, as
designated by the user's control file, and re-runs SOLGAS until it finds a quantity of that starting
material for which the adiabatic temperature and threshold ignition temperature are equal.
Specifics on the empirical threshold temperature are discussed below and in the main text of this
report. FLAME4d is written in Borland, Inc.'s Turbo Pascal v 6.0, compiled for IBM PC
compatible machines. It is a DOS program but generally is run in a DOS window under
FLAME4d is intended to use standard SOLGAS input files, specifically the format devised for
the 1995 version 3.02b5 . It will run SOLGAS via DOS redirection and the use of an
internally generated macro file, read SOLGAS's output, alter the control macro, and re-run
SOLGAS until the overall objective function converges to zero. The user creates a control file
listing the runs desired and the variable that is to be altered during the boundary search (in this
case, the initial quantity of any one of the starting materials). The program uses Newton's
method to find the value satisfying the desired condition (namely, that the adiabatic temperature
be equal to the empirical threshold temperature).
The algorithm used is as follows: initially, SOLGAS is run twice, the first time using quantities
specified in the driver file for that run and the second time with the control variable slightly
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Trowbridge, L.D. Estimation of Flammability Limits of Selected Fluorocarbons with F(sub 2) and CIF(sub3), report, September 1, 1999; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc623234/m1/56/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.