Contents
- 1 What is diesel engine efficiency?
- 2 In what two ways can you increase the ideal efficiency of an engine?
- 3 How can we increase the efficiency of a heat engine can we get 100% efficiency if yes how?
- 4 What is the most efficient engine?
- 5 How can we increase the efficiency in the engines?
- 6 How does direct fuel injection increase engine efficiency?
What is diesel engine efficiency?
Diesel Engines
| Engine type | Thermal efficiency |
|---|---|
| 4-Stroke, spark-ignition engine | 30% |
| 2-Stroke, spark-ignition engine | 22% |
| 4-Stroke, DI compression-ignition engine | 40.3% |
| 2-Stroke, DI compression-ignition engine | 43% |
In what two ways can you increase the ideal efficiency of an engine?
Answer: Assuming very large heat & cold sinks, you can increase the Carnot efficiency by increasing the hot temperature or by decreasing the cold temperature!
Why efficiency of diesel engine is high?
Diesel is more dense than petrol and contains about 15% more energy by volume. The higher compression ratio of the diesel engine means it has a high expansion ratio – the difference between the compressed space and the space opened up when the piston reaches the bottom of its travel. That equates to higher efficiency.
How efficient is a turbo diesel engine?
Fuel efficiency: Diesel is 33% more fuel-efficient than gasoline, and turbochargers further increase diesel fuel efficiency. Improved performance: While ramping up horsepower, they lower emissions and improve altitude compensation. Turbocharging an engine increases the power output of a given engine weight.
How can we increase the efficiency of a heat engine can we get 100% efficiency if yes how?
Answer: 100 % energy efficiency is never possible as there would be always some losses in the form of heat, friction, hysteresis, eddy losses etc.
What is the most efficient engine?
The demand for what the Guinness Book of World Records calls ‘the world’s most efficient 4-stroke engine’, the Wärtsilä 31, shows no signs of slowing down.
Which is faster diesel or petrol?
Though the diesel variant has a higher torque than the petrol, it does so on a lower rpm due to which shifting is necessary sooner than that on the petrol. Thus the petrol produces more power and accelerates from 0 to 100 quicker.
How to increase the performance of a diesel engine?
Perform periodic upgrading to the parts of the diesel engine. Installation of cold air intake systems will provide higher performance rates. In order to increase the combustion rate of the engine, install cold air intake system such that the air that flows into the engine is cooler than the air inside it.
How can we increase the efficiency in the engines?
The efficiency of any engine is simply calculated from the energy of the fuel supplied per unit time to do work and the output at the shaft of the engine after subtracting all losses. The input power of the fuel can be obtained from the mass of the fuel and its calorific value. The shaft output can be measuredfrom a brake dynamometer.
How does direct fuel injection increase engine efficiency?
It increases efficiency by 7 to 8%. Direct Fuel Injection: In previous engines, the fuel was mixed with air and injected, but nowadays fuel is directly injected into the combustion chamber and mixing takes place according to the profile of the combustion chamber. It increases efficiency by 11 to 13%.
Which is more efficient a diesel engine or a gasoline engine?
Compression ratio. The higher the compression ratio the higher the thermal efficiency. As in spark ignition or gasoline engines the compression ratio is limited by pre-ignition (not in compression ignition or diesel engines), the diesel engines are about 30% more efficient than gasoline engines.