calorific value/calorific value of coal

CALORIFIC VALUE/ calorific value of coal

calorific value

GCV

NCV

It is defined as the total amount of heat librated when a unit mass of a fuel is burnt completely.

Solid/liquid : cal/g or kcal/kg

Gaseous : cal/cm^3 or kcal/m^3

CALORIE:- It is defined as the total amount of heat required to raise the temperature of 1grams of water through 1 digree centigrate.

GROSS AND NET CALORIFIC VALUE(GCV and NCV):-GROSS CALORIFIC VALUE(GCV):-

It is the total amount of heat generateed when a unit quantity of fuel is completely burn in oxygen and the product of cumbustion are cooled down to the room temperature.

calorific value of coal

It is alseo called as “higher calrorific value” (HCV)

*HCV is determaine by bomb calorimeter.

NET CALORIFIC VALUE (NCV):-

It is defined as the net heat produced when a unit quantity of fuel is completely burnt & the product of combustion are allowed to escape.

It is also called as “lower calorific value”(LCV)

LCV=HCV – Latent heat of water vapour

LCV= HCV- Weight of hydogen × 9×latent heat

LCV=HCV- Weight of hydrogen×9×587 cal/g

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