Quick Answer: Which Is The Most Efficient Cycle?

Why are heat engines so terribly inefficient?

But yes, heat engines are generally quite inefficient.

Ultimately, it’s because heat itself is a fairly inaccessible form of energy.

Doing that removes energy from the gas so it cools and loses pressure.

By repeating the compression of a hot gas and extracting energy using a piston, we can get continuous work..

What is the most efficient heat engine?

The most efficient heat engine cycle is the Carnot cycle, consisting of two isothermal processes and two adiabatic processes. The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws.

Why Carnot cycle is not possible?

Carnot cycles are not encountered in reality since achieving isothermal heat transfer is very difficult (needs very large heat exchangers and long time). Also process 3-4 requires a pump or compressor that can handle two phase mixture (liquid and vapor) which is impractical.

Which type of Stirling engine is most efficient?

FEATURE OF STIRLING ENGINE Stirling engine is one kind of external combustion engine which converts thermal energy into kinetic energy by heating and cooling the working gas sealed in the cylinders. Thermal efficiency of Stirling cycle is as high as Carnot cycle which theoreticaly has the highest thermal efficiency.

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.

Can a perfectly 100% efficient system ever be created?

No. A system can never be 100% efficient. The reason behind this is because of heat and sound energy are lost in some amount in every system.

Is it possible to design and build a 100 percent efficient heat engine?

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.

What is the 2nd law?

The second law states that the acceleration of an object is dependent upon two variables – the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Why can a heat engine never be 100 efficient?

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 do you calculate cycle efficiency?

The efficiency of the cycle is obtained by comparing the total work W to the total heat input QIN. β = V4/V3 is the cutoff ratio. (V3 = V2.)

How can we increase 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!

Why is a perfect heat engine Impossible?

It is impossible to construct a perfect heat engine. … Since it absorbs heat, its entropy is increased. If it increases its entropy enough, it will ensure that the entire system has a net increase in entropy.

How do you increase Carnot efficiency?

The more effective way of increasing efficiency of Carnot engine is toA. Increase higher temperature.Decrease higher temperature.Increase lower temperature.Decrease lower temperature.

Which is more effective way to increase the thermal efficiency of a Carnot engine?

To increase the efficiency of a carnot engine, will you prefer to (i) increase the temp. of source by10K or (ii) decrease the temp. of sink by 10K? Hence efficiency of carnot engine can be increased by a greater amount by increasing the temp.

Does Carnot engine exist?

While Carnot engines are ideal engines, in reality, no engine achieves Carnot’s theoretical maximum efficiency, since dissipative processes, such as friction, play a role. Carnot cycles without heat loss may be possible at absolute zero, but this has never been seen in nature.