To calcualte NCV you need calorific value on GAR, H on gar and Total moisture.
Anthracite has the highest calorific value. and South African coal is best in the world.
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Coal
Gross calorific value of coal
what is the differnence between gross calorific value and useful heat value
gross calorific value
Coal-peat-lignite-dried wood
Useful heat value(UHV) pricing mechanism of coal deducted ash and moisture content from standard formula and in this coal is categorised into 7 grades. Gross calorific value(GCV) of coal has 17 grades and prices are linked to the actual calorific value/quality of coal-by latika joshi
NCV means Net Calorific Value. The lower calorific value or Net calorific value (NCV) which supposes that the products of combustion contain the water of combustion to the vapor state. The heat contained in this water is not recovered.
it is for determining gross calorific value of any coal
It varies based on the type and grade of coal. The heat value is less for bituminous than for anthracite, etc.
Theorotical value can be calculated using the results of ultimate analysis of coal . Based on the GCV of combustible value of coal.