How is the unit Nm3/hr defined?
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How is the unit Nm3/hr defined? Thank you. This post was last edited by WSL01218 on 2008-12-10 15:33.]
The volumetric flow rate of this gas under standard conditions. Generally, once the mass flow rate of a gas is determined, its volume flow rate changes with pressure/temperature. To have a consistent unit, the volume flow rate of gases is usually expressed in Nm3/hr. This post was last edited by virgoboy on 2008-12-10 14:54]
Standard cubic feet per hour: There are two definitions for standard cubic feet; the pressure is always 1 atmosphere, but the temperature varies. The \"Code for Design of Urban Gas Supply\" (GB 50028-93) specifies that the measurement conditions for the volumetric flow rate of gas are 0°C and 101.325 kPa. One option is to use 20 degrees Celsius or 60 degrees Fahrenheit (15.6 degrees Celsius). To distinguish it from the previous standard state, the volume of 1 m3 of gas measured under this condition is called 1 base cubic meter, abbreviated as 1 base cubic or 1 cubic, denoted as 1m3. The petroleum and natural gas industry in our country uses 20°C; for example, the \"Standard orifice plate method for measuring natural gas flow rate\" (SY/T613-1996) specifies that the measurement conditions for natural gas volume flow rate are 20°C and 101.325 kPa. Countries such as the UK and the US, on the other hand, use the imperial unit of 15.6°C, which is usually denoted as 1 Std m3 or 1 m3.
It is the volume obtained at 1 standard atmosphere and a temperature of 273 K; this volume is expressed in standard cubic meters per hour, that is, Nm3/h
I agree with the explanation on the third floor; it’s very detailed and clear. It is essential to clarify the design conditions during the design process; otherwise, there will be a big difference
This post was last edited by ai444099439 on 2011-3-2 23:52, with updates marked every hour. Is the specified value the volume at one atmosphere pressure and 20 degrees Celsius? It should be the volume at 0 degrees Celsius!
Am3/h is the volume unit under operating conditions, while Nm3/h is the volume unit under standard conditions. Use the PV/T equation to convert the values of P, V, and T. Typically, the flow rate under standard conditions is provided to convert it to the flow rate under operating conditions. These units apply to gases; liquids are not covered.
The guy on the 7th floor got it wrong; it should be the volumetric flow rate of the gas at 1 standard atmosphere and a temperature of 273K
Volume flow rate of a gas at 273 K at 1 standard atmosphere, Nm3/h
Volume of a gas at 0°C and 1 atmosphere pressure