Why efficiency of Otto cycle is greater than 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.
Why is the thermal efficiency of diesel engine higher than that in gasoline engine?
The second reason that diesel engines have a higher thermal efficiency than gasoline engines is that of the oxygen to fuel ratio. The greater the amount of air in an air-to-fuel ratio, the cleaner the fuel burns and the more energy it produces. Diesel engines can run on an extremely lean mixture.
Which cycle has the highest thermal efficiency?
Otto cycle
Which engine has higher thermal efficiency?
Real diesel engines are of course considered to be more efficient that Otto cycle engines; one reason being that diesel engines typically operate at higher compression ratio and the expansion ratio from even the later stages of heat release can still be considerably higher than that of most real Otto cycle engines.
Does Carnot engine exist?
A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. The basic model for this engine was developed by Nicolas Léonard Sadi Carnot in 1824.
Can a Carnot heat engine attain 100% efficiency?
Carnot’s interesting result implies that 100% efficiency would be possible only if Tc = 0 K—that is, only if the cold reservoir were at absolute zero, a practical and theoretical impossibility. PV diagram for a Carnot cycle, employing only reversible isothermal and adiabatic processes.
Can you design a heat engine of 100% efficiency?
Or, it is not possible to design a heat engine that has an efficiency of 1.00 or 100%. The efficiency of a heat engine can be 100% only if all the heat energy gets converted into work (or mechanical energy). In other words, it will never be possible to design a heat engine having 100 per cent efficiency.
How do you calculate efficiency?
The work efficiency formula is efficiency = output / input, and you can multiply the result by 100 to get work efficiency as a percentage.
Can the value of thermal efficiency be greater than 1 Why or why not?
When you have a heat pump, you are comparing the amount of work needed to move heat from one reservoir to another with the amount of heat that is actually added to the target reservoir – when the temperature difference is small, you only need a small amount of work to move a large amount of heat, so “efficiency” by …
What is unwanted heat?
Waste heat is heat that is produced by a machine, or other process that uses energy, as a byproduct of doing work. Waste heat has lower utility (or in thermodynamics lexicon a lower exergy or higher entropy) than the original energy source.