Why is LPG better than wood for fuel?
(b) LPG has more calorific value and produces no pollution. So it is better domestic fuel than wood. (c) The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so paper does not attain its ignition temperature.
Which gas has highest calorific value?
hydrogen
Which has more calorific value?
LPG has more calorific value when compared to diesel, petrol, and kerosene….Calorific Value of Fuel.
| Fuel | Calorific Value Of Fuel( Approximately) |
|---|---|
| Coal | 33000 |
| Biogas | 40000 |
| Diesel | 45000 |
| kerosene | 45000 |
How is calorific value calculated?
Whether to lower calorific value can be found simply by subtracting latent heat of steam or both the latent heat and sensible heat in cooling from 100°C from the gcv. However, in literature, the ncv of the fuel is obtained by subtracting from the hcv the amount 2466 kJ/kg.
What is calorific value unit?
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.
What does high calorific value mean?
The higher heating value (also known gross calorific value or gross energy) of a fuel is defined as the amount of heat released by a specified quantity (initially at 25°C) once it is combusted and the products have returned to a temperature of 25°C, which takes into account the latent heat of vaporization of water in …
What is petrol calorific value?
Diesel and petrol engines The calorific value of diesel fuel is roughly 45.5 MJ/kg (megajoules per kilogram), slightly lower than petrol which is 45.8 MJ/kg. However, diesel fuel is denser than petrol and contains about 15% more energy by volume (roughly 36.9 MJ/litre compared to 33.7 MJ/litre).
What is fuel value?
Fuel values are defined as the amount of energy generated by complete combustion of a particular mass of the fuel (usually one gram). It takes more energy to move larger amounts of mass; thus the higher the energy density (fuel value) the less energy is used transporting the fuel.
Why NCV is less than GCV?
Answer: This is because,NCV (net calorific value) is the quantity of heat produced by combustion when the water produced by combustion remains gaseous. Since water releases heat when it condenses, GCV is clearly bigger than NCV.
When GCV is equal to NCV?
NCV = GCV – Mass of hydrogen per unit weight of the fuel burnt x 9 x Latent heat of condensation of water vapour that is equal to 587 kcal/kg.
How do you convert GCV to NCV?
= 32060.2 KJ/Kg NCV = GCV – 24.44(9×%H + %M) = 30630.26 KJ/Kg Thus NCV = 0.955 times GCV in this case.
Why is HCV higher than NCV?
Answer: The lower calorific value or Net calorific value (NCV) which supposes that the products of combustion contain the water of combustion to the vapor state. The higher calorific value or Gross calorific value (GCV) which supposes that the water of combustion is entirely condensed.
Is GCV a NCV?
Gross calorific value (GCV) is the amount of heat released by the complete combustion of a unit of natural gas. Net Calorific Value (NCV) also known as lower heating value (LHV) or lower calorific value (LCV) is determined by the subtracting the heat of vaporization of the water vapour from the higher heating value.
What is the difference between HCV and LCV?
HCV is the amount of heat or energy liberated from the combustion of a fuel when its byproducts are condensed to recover some of the energy released from the combustion. In comparison, LCV is the amount of energy liberated from the combustion of a fuel when its byproducts freely escape from the system.
Why is LCV less than HCV?
2) LCV: – It is amount of heat liberated when a unit mass of fuel is burnt completely in the presence of air or oxygen and the product of combustion are let off completely into air. It does not include the latent heat of steam. Therefore it is always lesser than HCV.
Which is least calorific value?
oxygen
How do we save petrol?
Fuel-saving tips
- Stay aerodynamic. Wind resistance increases fuel consumption.
- Slow down. According to the AA, dropping from 80mph to 70mph could save you up to 25% in fuel.
- Maintenance.
- Sensible driving.
- Drop the revs.
- Look after tyres.
- Reduce weight.
- Speed bumps.
How can we save petrol answer?
Avoid aggressive driving: Speeding, rapid acceleration and braking wastes a lot of fuel. It can reduce fuel efficiency by up to 33% on highways and 23% in city. Excessive braking increases friction and thus reduces efficiency of the engine. Avoid Idling: Idling is when engine is on even when the vehicle is not moving.