Define calorific value of a fuel.
Answers
Answer:
Calorific value is the amount of energy released or produced when 1 kg of fuel burns or any other substance is burnt in the presence of oxygen and the products of combustion are cooled to STP. Its SI unit is kJ/kg.
Calorific value refers to the amount of heat produced by unit volume of a substance by complete combustion
Calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal conditions. It is also called calorific power. The unit of calorific value is kilojoule per kilogram i.e. KJ/Kg.
Water vapour is generated in the combustion process and the heat should be recovered by using certain techniques. If the heat contained in the water vapour could be recovered then it has high calorific value. If heat contained in the water vapor could not be recovered when it has low calorific value.
The efficiency of fuel or food mainly depends on the calorific value. If the value is high, its efficiency will also be high. If the value is low, its efficiency would also decrease. Calorific value is directly proportional to its efficiency.
It is very important to have a knowledge of the calorific value of fuel to carry out our day-to-day activities. This knowledge helps us to determine the amount of energy we transport. The gas shippers and suppliers require this information to bill gas consumers. It also helps to determine transportation charges of gas shippers and suppliers.
The human body requires calories to carry out daily activities. Without calories, the body would stop working and the cells in the body would die. But, if people consumed only a specific amount of calories each day, they would lead a healthy life. Too high or too low calorie consumption eventually leads to health problems
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✪ Question ✪
Define calorific value of a fuel.
✪ Answer ✪
The amount of heat energy released by a unit quantity of fuel on complete combustion in oxygen is called the calorific value of the fuel. The calorific value is expressed in kilojoules per kilogram (kJ/kg), kilocalorie/kilogram (kcal/kg), etc. Higher the calorific value of a fuel, the better is the fuel. Hydrogen is considered the best fuel as it has the highest calorific value. However, it is difficult to handle it in gas form. Liquid hydrogen is used as a fuel in spacecraft. The calorific value of Hydrogen is 141.9 kJ/g, charcoal is 29.6 kJ/g, LPG is 48 kJ/g, Methane is 55 kJ/g, petrol is 48 kJ/g.
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