What is maximum efficiency of diesel engine?
For example, advanced internal combustion engines found in modern automobiles have peak thermal efficiencies around 35-40% for gasoline and 40-45% for diesel. Massive marine diesel engines are capable of thermal efficiencies over 60%, however, these engines are exceptional in this regard.
How do you increase the thermal efficiency of an engine?
Increasing compression ratio and dilution are effective means to increase the thermal efficiency of gasoline engines. Increased compression ratio is associated with issues such as slow combustion, increased cooling loss, and engine knocking.
What variables affect the efficiency of a diesel engine?
According to Popular Mechanics, the reason diesel engines have a higher thermal efficiency than gasoline engines is that of two factors: compression ratios and lean-burn combustion.
What are the disadvantages of diesel engines?
Cons of diesel cars
- Diesel cars tend to be more expensive to buy than similar petrol models.
- Diesel fuel usually costs more.
- Servicing can be more expensive, although you don’t need to do it as often.
- Insurance can be 10-15% higher. [ …
- Diesel cars produce a lot more NO2.
Which engine has highest efficiency?
The Stirling cycle engine has the highest theoretical efficiency of any thermal engine but it has a low output power to weight ratio, therefore Stirling engines of practical size tend to be large.
What if petrol is used in diesel engine?
Putting petrol in a diesel car can cause serious damage to the fuel injection system and engine. … When petrol is added to diesel it reduces its lubrication properties, which can damage the fuel pump through metal-to-metal contact and create metal particles causing significant damage to the rest of the fuel system.
Is Carnot engine 100 efficient?
In order to achieve 100% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work. The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity.
What increases engine efficiency?
Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. … The engine computer, acting in concert with the engine air flow sensor, electronic fuel injectors, and exhaust oxygen sensor, maintains the stoichiometric ratio for most of your driving.
Which is more efficient Otto or Diesel cycle?
6 Diesel Cycle
Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
How efficient is a modern diesel engine?
Modern compression-ignition diesel engines dominate the commercial trucking industry with efficient engines that convert about 43%–44% of fuel energy into engine work, based on 2013–2014 certified engines. … This would mean engine CO2 emissions would be reduced by an average of 0.3% to 0.4% per year through 2030.