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Thread: Flash gas calculation software
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11-02-2009, 11:45 AM #1
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Flash gas calculation software
I found this handy software for calculation of flash gas ratio.
And this is continuation on discussion about software in this thread.
To me it is still not something unusual because that 100% could be easy 99,99% and software rounded it to 100%.
Volume of gas is many time greater than volume of liquid so it could be that only 0,01% of total volume is liquid with 53% of mass ratio.
Specific volume of R134a gas at 2psi is 1,16070m^3/kg and R134a liquid specific volume at 2psi is 0,00066m^3/kg.
Ratio is 1/1758,636 and by this, it makes perfect sense to me that it could be 99,99 volume of gas and only 0,01 volume of liquid while mass of gas is 53%.
I made some calculations and I wish that someone confirm that this is OK calculation.
If we have 530 gr. of gas and 470 grams of liquid that give us 0,615171m^3 of gas and 0,00040601286 m^3 of liquid.
0,00040601286/0,615171=0,00066 volume ratio of liquid
0,00066*100=0,06% percentage ratio of liquid
100%-0,06%=99,94% percentage ratio of flash gas
How is software came to mass ratio is something I don't know. Is this obtained from P-h Chart?
I can explain why this happens in EES if you wish and it may be an intersting topic but its not what I seek at the moment.Last edited by nike123; 11-02-2009 at 09:03 PM.
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