Why Carnot engine is most efficient?

The Carnot cycle is reversible representing the upper limit on the efficiency of an engine cycle. … The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature.

Why Carnot cycle is the most efficient engine?

Efficiency. The Carnot cycle is the most efficient engine possible based on the assumption of the absence of incidental wasteful processes such as friction, and the assumption of no conduction of heat between different parts of the engine at different temperatures.

How efficient is a Carnot engine?

efficiency =WQH=1−TCTH. These temperatures are of course in degrees Kelvin, so for example the efficiency of a Carnot engine having a hot reservoir of boiling water and a cold reservoir ice cold water will be 1−(273/373)=0.27, just over a quarter of the heat energy is transformed into useful work.

How do you proof that Carnot engine is most efficient?

It seems that the only condition used in proving that the Carnot engine is the most efficient is that it is reversible. More specifically, the Carnot engine can be run in reverse as a refrigerator. Furthermore, it is asserted that all reversible engines will have the same efficiency.

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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. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature. …

Is Carnot cycle the most efficient?

The Carnot cycle is a theoretical cycle that is the most efficient cyclical process possible. Any engine using the Carnot cycle, which uses only reversible processes (adiabatic and isothermal), is known as a Carnot engine. Any engine that uses the Carnot cycle enjoys the maximum theoretical efficiency.

Is Carnot engine 100 efficient why why not?

Carnot’s principle states that it is impossible to design a heat engine whose only effect is to absorb heat from a high-temperature region and turn all that heat into work. In other words, it is highly unlikely to design a heat engine that is 100% efficient.

Which of the following Carnot engines is the most efficient?

Hence the Carnot engine operating between 300 K and 0 K has the highest efficiency of 1. This implies that the engine will convert all the heat energy provided to it into doing work.

What is the efficiency of Carnot cycle?

It is well known that the Carnot cycle efficiency ( η thermal = 1 − T L T H ) is maximized with the highest possible heat source temperature TH and the lowest possible heat sink temperature TL.

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.

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What is the most efficient thermodynamic cycle and why?

Classical thermodynamics indicates that the most efficient thermodynamic cycle operating between two heat reservoirs is the Carnot engine [1] , and a basic theorem expresses that any reversible cycle working between two constant temperature levels should have the same efficiency as a Carnot cycle [2].

Which of the following engine has 100% efficiency?

Efficiency of Carnot engine is 100% if. η=1-T2T1 for 100% effeicency η=1 which gives T2=0K.

What is the maximum value of efficiency?

Explanation: the maximum value of efficiency in a draft tube is 90 percent. it cannot exceed more than 90 percent because of the heat losses due to flow of fluid.