Dear people,
I have a question regarding the
"VENTILATION - requirements for accumulated flammable vapors"
ww.cheresources.com/flammable.pdf
A formula is provided in order to calculate the "rate of evaporation"
The problem I have is that two of the terms are not defined
"R g" and "T l"
I though that R g was the universal gas constent but regardless of the units none seem to fit. I am also not sure what T L should be. I tried solving in excel but no variations in order to provide the given answer fit.
Can anybody help
Many thanks
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"ventilation - Requirements For Accumulated Flammable Vapors"
Started by Lawlor Vincent, Mar 09 2012 05:27 AM
1 reply to this topic
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#1
Posted 09 March 2012 - 05:27 AM
#2
Posted 09 March 2012 - 07:51 AM
Might be the following
Computations made by the Evaporation Calculator
The calculator uses the following equation (Kawamura and Mackay 1985) to estimate evaporation rate:
E = A * Km * (Mw * Pv)/(R * T) (kg/s)
where E = evaporation rate, in kg/s, A = area of the evaporating puddle, in m^2, Km = mass transfer coefficient, in m/s, Mw = molecular weight of the selected chemical, in kg/kmol, Pv = vapor pressure, in Pa (from the partial pressure table for the selected chemical), R = the gas constant (8314 J/(kmol K)), and T = ambient temperature, in K. The evaporation of the fraction of the solution that is water is ignored since water isn't a hazardous chemical.
The units still don't fit the problem stated in:
ww.cheresources.com/flammable.pdf
Computations made by the Evaporation Calculator
The calculator uses the following equation (Kawamura and Mackay 1985) to estimate evaporation rate:
E = A * Km * (Mw * Pv)/(R * T) (kg/s)
where E = evaporation rate, in kg/s, A = area of the evaporating puddle, in m^2, Km = mass transfer coefficient, in m/s, Mw = molecular weight of the selected chemical, in kg/kmol, Pv = vapor pressure, in Pa (from the partial pressure table for the selected chemical), R = the gas constant (8314 J/(kmol K)), and T = ambient temperature, in K. The evaporation of the fraction of the solution that is water is ignored since water isn't a hazardous chemical.
The units still don't fit the problem stated in:
ww.cheresources.com/flammable.pdf
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