Why Carnot Cycle Is Not Possible

October 23, 2024 Post a Comment

Why carnot cycle is not possible

The Carnot engine is the most efficient heat engine which is theoretically possible. The efficiency depends only upon the absolute temperatures of the hot and cold heat reservoirs between which it operates.

Why is Carnot cycle not 100% efficient?

Efficiency is 100% when T1 is infinity or T2 is zero. Since we cannot reach absolute zero temperature so these conditions cannot be achieved.

Why Carnot cycle is not possible Quora?

The basic reason why we don't use Carnot cycle is that in Carnot cycle during the heat addition process we have to bring the heat source in contact with the working medium of the engine and need to replace it with an adiabatic cover for expansion and compression process.

Why Carnot Cannot be Realised in actual practice?

Why Carnot engine cannot be realised in practice? Carnot engine cannot be realised in practice because of the following reasons: (i) source and sink of infinite thermal capacity cannot be realised in actual practice, (ii) we cannot have perfect insulators and perfect conductors in actual practice.

What are the limitations of Carnot cycle?

Limitations Of Carnot Cycle: The Carnot Cycle is used to study the heat engine and not extend to other types of devices. In the practical engine, the heat loss will be possible wherein the Carnot Cycle it is not mentioned which results in the maximum efficiency (which is not possible).

Why is there no perfect engine?

No matter how good of an engineer you are, you can't invent a perfect engine. Why? It's because of an energy crisis that pervades our universe. And it's caused by entropy and the second law of thermodynamics.

Why 100% efficiency is not possible?

Is it possible to create a machine with 100% efficient? No, it is not possible to create a machine with 100%efficient because no, machine is free from effects of gravity every machine has it's own capability to work on a path and most of the machine's does not produced enery according to its input .

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.

Why is there no 100% efficiency?

Answer and Explanation: A machine cannot be 100% efficient because the Second Law of thermodynamics forbids it. The Second Law of thermodynamics states that a transformation whose only final result is to transform to work, heat extracted from a source which is at the same temperature throughout is impossible.

Is Carnot efficiency possible?

In thermodynamics, there exists a conventional belief that “the Carnot efficiency is reachable only in the reversible (zero entropy production) limit of nearly reversible processes.” However, there is no theorem proving that the Carnot efficiency is unattainable in an irreversible process.

Are Carnot cycles real?

A Carnot cycle is an ideal thermodynamic cycle proposed by French physicist Sadi Carnot in 1824 and expanded upon by others in the 1830s and 1840s.

Is Carnot cycle the only reversible?

This comes as the Carnot cycle neglects all irreversibilities such as friction, heat losses, etc. This makes the Carnot cycle a completely reversible cycle that consists of the following process: 1. Reversible isothermal expansion in which the gas absorbs thermal energy qin and expands at a constant temperature Th.

Why is there a Carnot limit?

The Carnot Limit “sets an absolute limit on the efficiency with which heat energy can be turned into useful work,” says MIT's Jane and Otto Morningstar Professor of Physics Robert Jaffe, who co-teaches a course on the physics of energy.

Can a Carnot cycle be irreversible?

The Carnot cycle is essentially a reversible cycle that itself consists of four reversible processes.

Why is Carnot the most efficient?

Carnot cycle: It is an ideal reversible thermodynamic process that includes the following four processes: Isothermal expansion: No other heating is more efficient than this one, as there is no finite temperature difference between the heat source and heat receiver. Thus, it is the most efficient reversible process.

Why are there no 7 cylinder engines?

Seven-cylinder engines are more prone to vibration than even-numbered V8 engines of the same displacement because of the odd number of cylinders. It is even more difficult mathematically compared to other choices. The number 7 is mathematically more complex to work with than even numbers (2,4,6,8).

Why are there no straight 8 engines?

The high compression ratios lead to high stressed engines, which brought the flaws of a long crank shaft to light. This is eventually what killed the straight-eight, since the shorter crankshaft on a V8 does not have these issues. The last straight-eight rolled off the line in 1954 in the Packard Pacific.

Why are there no 14 cylinder engines?

Fourteen cylinders in a V engine would involve a great deal of research into engine balance, torsional effects in the crank and other issues because so few people have done it.

Is 0 efficiency possible?

Efficiency of a machine is simply defined as the useful work out divided by the heat you had to put in. All you need to do to have a zero efficiency machine is make sure it does not useful work. Friction is an excellent zero-efficiency conversion mechanism.

What is 100% efficiency called?

A simple machine, such as a lever, pulley, or gear train, is "ideal" if the power input is equal to the power output of the device, which means there are no losses. In this case, the mechanical efficiency is 100%.