1) net calorific value 2) lower heating value 3) net specific energy 4) net heating value 5) low calorific value 6) low heat value a) in general sense, the number of heat units measured as being liberated when a mass unit of fuel is burned in oxygen saturated with water vapour in a bomb under standardised conditions, the residual materials being taken as gaseous oxygen, carbon dioxide, sulphur dioxide and nitrogen, water as water vapour and ash; the international reference temperature is 25°C (the standardised conditions being defined in ISO-R-1928-71); b) in the gas industry, the amount of heat liberated by the complete combustion, under specified conditions, of unit volume of a gas, the water produced by the combustion of the gas being assumed to remain as a vapour, the other products of combustion being referred to the standardised test conditions as applied in different countries
NCV(I); LHV (2) GRM: n. (1,2,3,4,5,6) Note: hence the net calorific value is the gross calorific value less the latent heat of evaporation of the water that formed; contrary to the higher heating value, the water produced is assumed to remain as a vapor and the heat not recovered during combustion of the fuel; mining and processing of solid fuels; in the case of solid fuels and liquid fuels of low volatility, a lower value calculated from gross calorific values as the heat produced by combustion of unit quantity, at constant atmospheric pressure, under conditions such that all water in the products remains in the form of vapour References: SEEgross calorific value SEEhigher heating value