How can we improve the efficiency of heat engine?
1 Expert Answer. Assuming very large heat & cold sinks, you can increase the Carnot efficiency by increasing the hot temperature or by decreasing the cold temperature!
What makes an engine more efficient?
Most petrol (gasoline, Otto cycle) and diesel (Diesel cycle) engines have an expansion ratio equal to the compression ratio. Some engines, which use the Atkinson cycle or the Miller cycle achieve increased efficiency by having an expansion ratio larger than the compression ratio.
Why 100 efficiency is impossible?
It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.
How can we increase the efficiency of a heat engine can we get 100% efficiency if yes how?
The equation is Hot Temperature minus Cold Temperature over Hot Temperature. These temperatures must be in kelvins to work in the equation. Hence the only way to get 100% efficiency is to have an engine run in an absolute zero vacuum, which we dont have the technology to produce, assuming its possible at all.
Which type of engine is most efficient?
The electric engine is most efficient. Electric motors are very efficient at converting electricity into work. Physicists throw around abstract numbers like 90%, whereas when discussing combustion engines, they use numbers less than 40%.
How can I increase the power of my car engine?
Here are some popular methods to increase your engine’s horsepower.
- Cold Air Intake. Upgrading your vehicle’s intake is one of the easier methods for unlocking some extra horsepower. …
- Performance Exhaust. …
- Software. …
- Forced Induction. …
- Performance Engine Build. …
- Engine Conversion.
Which fuel is most efficient?
Diesel is 33% more efficient than gasoline when it comes to fuel mileage. This means that if we get 40 miles to the gallon on gasoline, a diesel equivalent engine will give 53.2 miles per gallon.
Is there any real machine where its efficiency is 100% why?
Answer: In practice no machine can achieve 100% efficiency. When you mean 100% efficiency it means your input energy should be completely transformed to output energy. … Various mechanical and electrical losses like friction and eddy current losses are the reasons behind the energy dissipation.
Can a system be 100% efficient?
Because of conservation of energy EVERY system produces an equal amount of energy that’s put into the system. … So if you put in 100 watts of power and get 50 watts of light the system is 100% efficient. There is a principle called “unity efficiency” that can allow you to produce MORE than 100% of the input.
Are Carnot engines 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.
Why is Carnot engine Impossible?
The conceptual value of the Carnot cycle is that it establishes the maximum possible efficiency for an engine cycle operating between TH and TC. It is not a practical engine cycle because the heat transfer into the engine in the isothermal process is too slow to be of practical value.
Can you create heat efficient 100 efficiency?
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 we 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. This is used across different methods of measuring energy and work, whether it’s energy production or machine efficiency.