Table of Contents
- 1 How is calorific value related to a fuel?
- 2 What is the relation between calorific value and efficiency of fuel?
- 3 Why a fuel with higher calorific value is more preferred?
- 4 What do you mean by calorific value of a fuel distinguish between gross and net calorific value of fuel?
- 5 Which has maximum calorific value?
- 6 How is calorific value determined?
- 7 What is the meaning of calorific value of fuels?
- 8 How do you calculate the energy content of a fuel?
The calorific value of food indicates the total amount of energy, a human body could generate during its metabolism which is expressed in Kilojoules per 100 grams or 100 ml. The calorific value of food is generally expressed in kilocalories i.e. kcal….Calorific Value of Fuel.
| Fuel | Calorific Value Of Fuel( Approximately) |
|---|---|
| LPG | 55000 |
What is the relation between calorific value and efficiency of fuel?
The efficiency of fuel of food is dependent on the calorific value; higher the value, higher the efficiency, and similarly lower the calorific value, lower is the efficiency. Therefore, it can be said that the calorific value of a substance is directly related to or proportional to its efficiency.
Which fuel has high calorific?
hydrogen
Calorific value is nothing but the energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Hence, hydrogen has the highest calorific value.
What is the formula for net calorific value?
Procedure to Calculate Calorific Value Net Calorific Value (NCV) means lower heating value (LHV) i.e. lower calorific value (LCV) is determined by the subtraction of heat of vaporization of the water vapour from the higher heating value.
Why a fuel with higher calorific value is more preferred?
The calorific value of a fuel should be high, so that large quantities of heat can be obtained from a small quantity of coal. It should have low ash content since the presence of ash reduces the heating value of coal. Coal should have high calorific intensity.
What do you mean by calorific value of a fuel distinguish between gross and net calorific value of fuel?
The key difference between net calorific value and gross calorific value is that net calorific value is the amount of heat that is created when water is converted into water vapor upon combustion of a material, whereas gross calorific value is the amount of heat created when water is converted into water vapor and back …
What is the factor on which difference between the two heating values of fuel depends on?
Explanation: The difference between the two heating values depends on the chemical composition of the fuel. In the case of pure carbon or carbon monoxide, the two heating values are almost identical, the difference being the sensible heat content of carbon dioxide between 150oC to 25oC.
What is the difference between higher calorific value and lower calorific value?
HCV (higher calorific value) and LCV (lower calorific value) are two measurements of heat liberated from the combustion of a unit mass of fuel. Also, HCV is also known as the gross calorific value while LCV is known as the net calorific value.
Which has maximum calorific value?
Ethanol and fats have the highest amount of calorific value per gram i.e. 29 and 37 kilojoules per gram or 6.9 and 8.8kcal/g respectively and proteins and most carbohydrates both have about 17kJ/g or 4kcal/g.
How is calorific value determined?
the calorific value can be calculated. For other foods (e.g. meat products), it is measured using a device called a “bomb calorimiter”. Essentially, you put the food in a chamber filled with pure oxygen and burn it, measuring the amount of heat (i.e. energy) that is generated.
Should a good fuel have high calorific value?
A good fuel should satisfy the following requirements: It should have a high calorific value i.e., it should evolve a large amount of heat when it is burnt. Its moisture content should be low so that its heating value should be high. An ideal fuel should have moderate ignition temperature.
What affects calorific value?
The amount of heat produced by the complete burning of 1kg of a fuel is called its calorific value. The calorific value of a fuel depends upon the nature of the fuel and the relative proportions of the elements present .
What is the meaning of calorific value of fuels?
Meaning of Calorific Value of Fuels: The calorific value or the heat value of a solid, liquid or gaseous fuel is defined as the number of heat units developed by the complete combustion of unit mass or unit normal volume of a given fuel. It may be expressed as kJ/kg or kJ/normal m 3.
How do you calculate the energy content of a fuel?
The resulting energy value divided by grams of fuel burned gives the energy content (in J/g). The combustion process generates water vapor and certain techniques may be used to recover the quantity of heat contained in this water vapor by condensing it.
What is the calorific intensity of combustion?
In combustion work the term calorific intensity is used which means the maximum temperature attained in a given combustion. For gaseous fuels the calorific value is expressed as kJ/m 3 measured at STP. Any fuel containing available hydrogen will form water vapour during the process of combustion.
What happens to the calorific value when volume increases?
If there is an increase in volume then some energy will be used up in performing the work of expansion. In this case the calorific value will be decreased. If there is no change of volume, the calorific value of the fuel remains unchanged.