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  #1  
Old 07-05-2002, 11:23 PM
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Need Help With A Conversion

Does anyone know how to convert cfm to lb/min?
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  #2  
Old 07-06-2002, 12:06 AM
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The way I see it, you're comparing an area (cubic feet) to a weight (the weight of i would assume a cubic foot of air). If you know the weight of a cubic foot of air, which i believe varies with heat and altitude, then you could multiply the known cfm by the weight and have your answer.
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Old 07-06-2002, 01:45 AM
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type "metric conversion" into a search engine and you should get plenty results, many even with automatic conversion so you dont have to do your own math.
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Old 07-06-2002, 09:40 AM
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I looked there too. It's not a metric conversion, so I couldn't come up with anything, plus you have to know the actual "weight" to do it. It's a conversion from cubic feet to pounds.
There was one interesting site which explained the discovery of the weight of air and vacuums, it was a museum of science and industry in Italy. But there again, it also said how the weight of air changed with altitude, so there is no one correct answer, it changes.
It would be easy to do if you knew the exact weight of the cubic foot of air, then you would just multiply by the cubic feet per minute, which is just the rate of flow.
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Old 07-06-2002, 10:30 AM
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What is the application?

I have a feeling he is looking for pressure....
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Old 07-06-2002, 10:46 AM
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I am looking for flow rate. I did calculations for fitting a turbocharger to an engine in cfm but all of the compressor maps that I could find are compressor maps in lb/min of air. I need to make the conversion so that I can fit my calculations in cfm to the compressor map. One person told me to multiply cfm by the density of air.
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Old 07-06-2002, 08:14 PM
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Weight of air fluctuates with temperature, barometric pressure( altitude) humidity (water content)
If you can use round numbers (without adjusting for the above variables:
At 70degF, 45% humidity, at 14.7pd/sq.in pressure
1 liter of air weight 1.2 grams.
Hope it helps
jackD
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  #8  
Old 07-06-2002, 08:16 PM
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I got it all figured out guys. Thanks for your help though!!
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Old 07-06-2002, 10:30 PM
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All you have to do is call Innovative turbo systems. They will do the math for free!
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