Why are reversible processes more efficient?

Reversible processes do the most work, because they have to push against more external pressure. Since w = -PΔV, a greater value for the external pressure (P) results in a higher (more negative) work.

Why efficiency of reversible engine is maximum?

The engine, in which the process can be retraced at any stage of its operation by reversing the boundary conditions, is called a reversible heat engine. Its efficiency is maximum, as no dissipation of energy takes place against friction, etc in such a heat engine.

Why reversible process is more efficient than irreversible process?

The reason why more work is done by the system in a reversible process than an irreversible process is entropy is generated within the gas in an irreversible process. Whenever entropy is generated within the system there is a lost opportunity for the system to perform useful work.

Why work done in reversible process is more?

The work done in the reversible process is maximum, due to the loss of very little heat to the surrounding. … It means that the energy released by the reversible process will do the maximum amount of work because the smaller amount of energy is lost in the form of heat.

Which process is more efficient reversible or irreversible?

1. The efficiency of an irreversible heat engine is always less than the efficiency of a reversible one operating between same two thermal reservoirs. 2. The efficiencies of all reversible heat engines operating between the same two thermal reservoirs are the same.

Why is the reason that reversible processes is 100% efficient?

Reversible processes produce the maximum amount of work If a process does work on the surroundings, you get more work out of the process if it is done slowly. This is because less heat is lost to the surroundings. So a reversible process (infinitely slow) does the maximum work. You may also read,

Why is entropy of reversible process always zero?

The entropy of various parts of the system may change, but the total change is zero. Furthermore, the system does not affect the entropy of its surroundings, since heat transfer between them does not occur. Thus the reversible process changes neither the total entropy of the system nor the entropy of its surroundings. Check the answer of

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.

Which engine has maximum efficiency?

A Carnot engine operating between two given temperatures has the greatest possible efficiency of any heat engine operating between these two temperatures. Furthermore, all engines employing only reversible processes have this same maximum efficiency when operating between the same given temperatures. Read:

Why is Carnot engine most efficient?

The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature.

Why reversible process is slow?

Because reversible processes are very slow, the system is always very nearly in equilibrium at all times. … In that case all its state variables are well defined and uniform, and the state of the system can be represented on a plot of, for instance, pressure versus volume.

Is reversible process possible?

Having been reversed, it leaves no change in either the system or the surroundings. Since it would take an infinite amount of time for the reversible process to finish, perfectly reversible processes are impossible.

What is special about a reversible process?

(a) What is special about a reversible process? For a reversible process the forward and the reverse changes occur by the same path. Both the sysytem and the surroundings are restored to their original condition by reversing the change. … The surroundings are also returned to its original state via reversible path.

Is free expansion reversible?

Any expansion of a system in which the applied pressure is less than the system pressure can be called a free expansion. … The free expansion of a gas is an irreversible process; in principle, the temperature of a gas undergoing a free expansion is not a meaningful quantity.

Does all reversible engines have same efficiency?

All reversible heat engines operating between the two given thermal reservoirs have the same efficiency. The efficiency of reversible heat engine does not depend on the working fluid, it depends only on the temperature of the reservoirs between which it operates.

What is an example of a reversible process?

Some examples of reversible processes are uniform and slow expansion or compression of a fluid, such as fluid flows in a well-designed turbine, compressor, nozzle, or diffuser. Reversible processes is differentially removed from equilibrium with no (appreciable) internal temperature, pressure, and velocity changes.