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Old 09-30-2009, 07:31 AM
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Default Converting M3/Min to KG/Hr

Hi
i'm looking to convert an air flow reading of 1.380 +/-0.050 M3/Min to KG/Hr. Is this possible?

Andy
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Old 09-30-2009, 08:08 AM
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Default Re: Converting M3/Min to KG/Hr

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Hi
i'm looking to convert an air flow reading of 1.380 +/-0.050 M3/Min to KG/Hr. Is this possible?

Andy
Air flow volume literally has no meaning unless the temperature and pressure are stated. In addition, you need to know if it is dry air, or, if moist, either the dew point or relative humidity.

With temperature, pressure, and humidity, you can calculate (or lookup) the density and convert.
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Old 10-01-2009, 02:32 AM
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Question Re: Converting M3/Min to KG/Hr

Hello John,

thanks for the reply. Please assumption that the temperature & pressure are the same. The test equipment we have is set up to read Kg/Hr which is an industry standard and unfortunately the diagram we have to work from only shows the Air flow reading to match against as 1.38 M3/Min.

So we assume they're would be a way of converting the 1.38 figure to a Kg/Hr?

Cheers, Andy
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Old 10-01-2009, 02:43 AM
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Default Re: Converting M3/Min to KG/Hr

Quote:
Originally Posted by Unregistered View Post
Hello John,

thanks for the reply. Please assumption that the temperature & pressure are the same. The test equipment we have is set up to read Kg/Hr which is an industry standard and unfortunately the diagram we have to work from only shows the Air flow reading to match against as 1.38 M3/Min.

So we assume they're would be a way of converting the 1.38 figure to a Kg/Hr?

Cheers, Andy
The same as what? Gas expands to fill the volume available, so volume has no meaning without a clear statement of the pressure and temperature at which it is measured.

In metric, gas volumes are often measured at "normal" conditions of 101.325 kPa, 0 C, and labelled normal cubic meters, Nm. Mass of dry air is about 1.29 kg/Nm, but it DOES vary with temperature, pressure, and humidity.

1.38 m/min is 82.8 m/h.
Assuming this volume is measured at "normal" the mass flow is 106.8 kg/h. Vs. "normal" at any other conditions, the density will be directly proportional to absolute pressure and inversely proportional to absolute temperature. Humid air will be lighter.
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