What does higher calorific value mean?

The higher heating value (HHV; gross energy, upper heating value, gross calorific value GCV, or higher calorific value; HCV) indicates the upper limit of the available thermal energy produced by a complete combustion of fuel. It is measured as a unit of energy per unit mass or volume of substance.

Why are fuels with higher calorific value more efficient?

Fuel with higher calorific value are considered efficient fuel because the higher calorific value, the more efficient fuel is, as it can produce more heat in less time.

Is greater the calorific value better is the fuel?

Greater the calorific value, better is the fuel. Fuel efficiency is measured as the amount of heat produced by burning 1 Kg of fuel known as the calorific value of the fuel. …

What do you understand by higher and lower calorific value of fuel?

The lower heating value (also known as net calorific value) of a fuel is defined as the amount of heat released by combusting a specified quantity (initially at 25°C) and returning the temperature of the combustion products to 150°C, which assumes the latent heat of vaporization of water in the reaction products is not …

What is the relation between high calorific value and low calorific value?

Moreover, LCV is equal to the value obtained by the subtraction of the heat carried away by the steam from HCV. HCV (higher calorific value) and LCV (lower calorific value) are two measurements of heat liberated from the combustion of a unit mass of fuel.

What is the relationship between calorific value and efficiency of a fuel How is calorific value expressed?

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.

What do you understand by fuel efficiency?

Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work.

Is calorific value of wood is higher than that of coal?

Coal has a higher calorific value as compared to wood. Hence, the given statement is ‘False’. It is a measure of the heating ability of a coal and is needed to estimate the amount of coal needed to produce a desired amount of heat.

Why are diesel engines noisier than petrol?

Diesel engines make a lot of noise while burning the fuel. The main reason behind this is that diesel molecules are much bigger than petrol molecules and the engines run on high compression. The heat which is generated during compression leads to self ignition of the fuel. Thus, clattering noises are produced.

Why do petrol cars sound better than diesel?

Most diesel engines redline at 2,200 rpm to 2,500 rpm. Finally, diesel engines have higher cylinder pressures. This makes the sound exiting the exhaust valve produce a different sound and resonance than the sounds exiting the cylinder in a petrol car.

What is the higher calorific value of the fuel?

The heat liberated by the combustion of the fuel, neglecting the heat required to evaporate the water is called the Higher Calorific Value of the fuel (HCV). Higher calorific value is the maximum heat energy liberated by the complete combustion of the fuel.

Which instrument is used to measure the heat of combustion of fuels?

Calorimeter is the instrument that is used for the measurement of calorific value or heat of combustion of fuels. With fuels containing hydrogen, two calorific values are distinguished, higher or Gross Calorific Value and lower Or Net Calorific Value.

What is the best quality of fuel?

Best quality fuel shall have best calorific value that means by burning less amount we can get much energy in terms of heat and then drive the turbines through steam or flu gases etc. It is defined as “the total amount of heat liberated, when a unit mass of fuel is burnt completely”. The calorific value determines the efficiency of a fuel.

What is the difference between high and low calorific value?

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.