Calorific Values

The calorific value of a substance is the amount of energy that is released when burning a given amount of the substance.
This energy is released in the form of heat, when the substance is burned in standard conditions.
Calorific value is also known as ..
HEAT OF COMBUSTION  or ENERGY VALUE.

1. CALORIFIC VALUES BY : DCET II yr b.e

2. WHAT IS CALORIFIC VALUE…. ? hmm….. CALORIFIC VALUE..???

3. Uhh … The   calorific value   of a   substance  is the amount of  energy  that is released when burning a given amount of the substance . This energy is released in the form of  heat , when the substance is burned in standard conditions. Calorific value is also known as  .. HEAT OF COMBUSTION  or  ENERGY VALUE .

4. NOW.. It should be expressed too …… Expressed  Joules/kilogram .

5. Why….. Joules and Kilogram only ..?? It is expressed so because the energy of the material to be measured is a solid. How…... to measure the value ? Practically Theortically Both

6. a   Practically measured by ……. Bomb Calorimeter . The amount of  fuel  burned can be determined by difference in mass b . Theoritically ( Shall be discussed further )

7. A   Bomb Calorimeter is a type of constant-volume calorimeter  used in measuring the heat of combustion of a particular reaction. 

8. Every thing has types And so shall this be .

9. Types of calorific values

10. 1.

11. Higher calorific value Higher calorific value means the total quantity of heat liberated from combustion of unit mass or unit volume of given fuel when by products/side products are allowed to cool at room temperature.

12. 2.

13. Low calorific value Lower calorific value means the total quantity of heat liberated from combustion of unit mass or unit volume of given fuel when side products are allowed to escape.

14. Difference Main difference is in higher calorific value heat losses to cool down but in lower calorific value there is no heat because side products ( ash,volatile matter etc ) escapes.

15. Now… Measurement is also a factor Is’nt it?

16. There is a specific formula for everything . For calculating the calorific value of a fuel , a special formula has been introduced… Called DULONG’S FORMULA

17. Now calculation of HCV and LCV by Dulong’s formula

18. H.C.V.= (33800 C +144000 (H2 - O2/8) + 9270 S) KJ/Kg . LCV=[HCV-(0.09H)587]Kcal/Kg { for Solid & liquid fuels } {for gaseous fuels } LCV=[ HCV-(m x 587)]Kcal/ m 3 {for gaseous fuels } v

19. Enough for now .. Thank you for listening. BYE