## CALORIFIC VALUE/ calorific value of coal

*calorific value*

*GCV*

*NCV*
It is
defined as the total amount of

*librated when a unit mass of a***heat***is burnt completely.***fuel**
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 “

**” (HCV)***higher calrorific value*
*

**is determaine by***HCV**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