Combustion zone net heating value (NHVcz)

The energy released as heat when a combustion zone gas undergoes complete combustion with oxygen to form gaseous carbon dioxide and gaseous water (also referred to as lower heating value). The net heating value in the combustion zone (NHVcz) gas correlates well with combustion efficiency for steam assisted 

flares. It is a better indicator of efficiency than the heating value of the Vent Gas alone.

Elevated Flare definitions and calculation methods from 40 CFR 63 Subpart CC section 63.641

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