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  #1  
Old 03-24-2009, 01:38 AM
alonso25
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Default Convert Nm3/h to m3/h

Hello,
for my labwork, I need to express Nm3/h to m3/h. I know that the N of Nm3 stands for Normal, meaning standard temperature and pressure. So, I have used the following expression to calculate the volume in m3.

V2 = P1*V1*T2/(T1*P2)

My manometer gives a flow rate of 15 Nm3/h. So, by using the standard conditions (T1=273.15 K, P1=101325 Pa), I have found for different pressure at 298.15 K the following results :

P2(Pa) 200000 400000 600000 T2=298.15K V1=15m3
V2 (m3) 8.3 4.15 2.77

for example ,V2=101325*15*298.15/(200000*273.15)

I don't understand why the volume decreases when the pressure increases. could you help me please?
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  #2  
Old 03-24-2009, 05:33 AM
JohnS JohnS is offline
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Default Re: Convert Nm3/h to m3/h

Quote:
Originally Posted by alonso25
I don't understand why the volume decreases when the pressure increases. could you help me please?
The simplest analogy is inflating a tire. You take a relatively large amount of air at atmospheric pressure and "squeeze" it into the tire at higher pressure.
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  #3  
Old 03-24-2009, 10:15 AM
alonso25
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Default Re: Convert Nm3/h to m3/h

Thanks you for your answer.
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