Which one is the best basis to use for coal calories? ADB
#0183;#32;FROM GAR TO NAR . The difference between net and gross as received (NAR v/s GAR) specific energy values is the latent heat of the water vapor which lowers the effective calorific value in the boiler. To convert from GAR to NAR for bituminous coals subtract approximately: mj/kg. 260 kcal/kg. 470 btu/lb. Applicable for bituminous coal.