European basis for natural gas heating values
European basis for natural gas heating values
(OP)
I want to verify information on how most of the world measures heating value of combustion gases. Outside North America most places use the Lower Heating Value v.s. our Higher Heating Value. My question is what temperature and pressure is used in the EU when establishing the LHV. I think it's 1 atmosphere and 0°C but I cannot find a reference.





RE: European basis for natural gas heating values
As I can see in EN standards for appliances like Room Heaters and Storage water heaters, the basis is dry gas 1013.25 mbar and 15°C.
These standards are EN 613:2000, Heaters and EN 89 Water Heaters.
The standard for test gases is EN 437.
Luck,
WalterMoreno
RE: European basis for natural gas heating values
Pressure of 1013.25 mbar is in fact a Standard Atmosphere (1 atm = 760 mmHg), and 15 deg C is some miracle temperature value used for ages in all European standards. A cubic meter of any pure gas under those conditions is designated as a Normal Cubic Meter (Nm^3) of that gas and all physical characteristics of gases are usualy defined for the 1 Nm^3, including LHV and HHV.
RE: European basis for natural gas heating values
Interestingly, Miller states in 1981 in the US for ISO 5024 for natural gas, standard temperature is 15C/59F but also concedes that other temperature and pressure bases widely apply.
I remember 'normal' (which got me looking through my reference materials) from high school chemistry as being 0 deg C.
RE: European basis for natural gas heating values
Thanks to everyone.
RE: European basis for natural gas heating values
Its correct that is seems like a deliberate trap the definition of Sm3 and Nm3
nickwigen is correct:
Nm3 is 1 atm (14.7 psia) and 0 deg C
Sm3 is 1 atm and 15 deg C. Please note that 60 deg F is 15.6 deg C. Nobody that i have asked knwe why 15 and not 16 deg C is used.
To add more trouble: In the UK almost on Sm3 is used while in Norway almost only Nm3 is used. In Denmark we mix
Best Regards
Morten