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krishnirtt
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Join Date: Jun 2010
Location: chennai
Posts: 17

Unit Conversion

07/13/2011 2:54 AM

can anybody help me to change unit from Nm3/hr to m3/hr
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jesw55
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Join Date: Aug 2010
Location: Wales, UK
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#1

Re: unit conversion

07/13/2011 3:16 AM

Hi krishnirtt,

Nm³/hr (Normal meters cubed per hour) and m³/hr (meters cubed per hour) are terms for compressor output or machine consumption of compressed air and are the same. The Nm3/hr is the correct terminology as the output from a compressor is quoted at atmospheric pressure and not when it's compressed.

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John

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pritam
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Engineering Fields - Mechanical Engineering - New Member India - Member - New Member

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#2
In reply to #1

Re: unit conversion

07/13/2011 4:28 AM

Not only pressure, temperature correction is also required for conversion.

Nm³/hr (Normal meters cubed per hour) is volume rate of flow at normal temperature (0 deg C) and one atmospheric pressure. It is more accepted definition. Some places normal temperature is taken as 20 deg C.
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Codemaster
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#3

Re: unit conversion

07/13/2011 5:09 AM

Assuming by m3/h you mean (gas) flow at actual conditions, formula is

m3/h = Nm3/h/P*(T + 273)/273 where P = pressure in atmospheres (absolute), T = temperature in °C. 1 atmosphere = 760mm Hg = 1.01325bar.

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