Why is hydrogen not viable for IC engine fuel?
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Why is hydrogen not viable for IC engine fuel?
As such hydrogen combustion engines are not considered zero emission. The downside is that hydrogen is difficult to handle. Due to the very small molecular size of the hydrogen atom, hydrogen is able to leak through many apparently solid materials. Escaped hydrogen gas mixed with air is potentially explosive.
What are the advantages of hydrogen as a fuel compared to other coal based fuels?
Hydrogen fuel cells are cleaner and more efficient than traditional combustion-based engines and power plants. Hydrogen and fuel cells can also be used in mobile applications to power vehicles and mobile power packs. The benefits of fuel cells are: Reduced greenhouse gas emissions.
Why hydrogen is a good energy source?
However, hydrogen is useful as an energy source/fuel because it has a high energy content per unit of weight, which is why it is used as a rocket fuel and in fuel cells to produce electricity on some spacecraft.
What are the problems of using hydrogen in CI engine?
Hydrogen has very low density. This results in two problems when used in an internal combustion engine. Firstly, a very large volume is necessary to store enough hydrogen to give a vehicle an adequate driving range. Secondly, the energy den- sity of a hydrogen-air mixture, and hence the power output, is reduced.
What is the advantage of hydrogen as an IC engine fuel?
Explanation: The main advantage of hydrogen as an IC engine fuel is that there are no HC and CO emissions.
What is the heating value of hydrogen?
120-142 MJ/kg
Heat Values of Various Fuels
| Heat value | |
|---|---|
| Hydrogen (H2) | 120-142 MJ/kg |
| Methane (CH4) | 50-55 MJ/kg |
| Methanol (CH3OH) | 22.7 MJ/kg |
| Dimethyl ether – DME (CH3OCH3) | 29 MJ/kg |
Why is hydrogen fuel better for the environment?
Hydrogen fuel cells provide an inherently clean source of energy, with no adverse environmental impact during operation as the byproducts are simply heat and water. Unlike biofuel or hydropower, hydrogen doesn’t require large areas of land to produce.
Why is hydrogen not a reducing agent?
hydrogen decomposes to atomic hydrogen at higher temperature. hydrogen isomerises to ortho hydrogen at a higher temperature.. many metals form hydrides at lower temperature.
What is the difference between LHV and HHV of a fuel?
The recovered heat can then be used productively. So, in summary: 1. The numerical difference between the LHV and HHV of a fuel is roughly equivalent to the amount of latent heat of vaporization that can be practically recovered in a secondary condenser per unit of fuel burned.
What is the HHV of a hydrogen fuel cell?
The HHV for the combustion of hydrogen is 285.8 kJ/mole, but the Gibbs free energy for the reaction—and therefore the maximum electricity produced by a fuel cell—is only 237.2 kJ/mole. The difference, 48.6 kJ/mole, appears as heat produced in the fuel cell.
What is the higher heating value of a fuel?
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 the combustion products.
How much energy does it take to refuel a hydrogen car?
Air Products and Chemicals Inc. (APCI) estimates the need for 2.67 kWh/kg compression energy to 880 bar. They estimate the precooling energy required to cool hydrogen from 30o C to -20o C for a 700 bar refueling to be 0.18 kWh/kg H. 2 [10].