1. 2-11. Conversions (I) Gross & Net Calorific Value
Gross Calorific Value : The calorific Value in laboratory conditions
Net Calorific Value : The useful calorific value in boiler plant.
※ The difference is essentially the latent heat of the water vapor produced.
Kcal/kg
Net CV = Gross CV － 50.6H －5.85M － 0.191O
MJ/kg
Net CV = Gross CV － 0.212H － M － O
Btu/lb
Net CV = Gross CV － 91.2H － 10.5M － 0.34O
* The formula above differ by the customers
- Formula used by Korean GENCOs
Net CV = Gross CV – 5.72 (Har × 9)
where;
Har (Hydrogen on AR basis) = Hd × (100-TM)/100 ＋ × TM 1

2. 2-12. Conversions (II) Calorific Value Conversion GAD GAR NAR kcal/kg
6,700
6,322
6,063
MJ/kg ÷
28.05
26.47
25.38
Btu/lb
× 1.8
12,060
11,380
10,913
Dry Ash Free
(DAF)
Dry
(D)
As Received
(AR)
Air Dried
(AD)
Required Basis 2
* Multiply existing result by formula to take required basis