Question: Can the efficiency of Carnot engine be 100?

Can there be an engine that is 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.

Why the Carnot engine is not hundred percent efficient?

The efficiency is 100% only when T2 is zero or T1 is infinite. This is not possible since some amount of heat gets rejected to the sink.

In what conditions can a Carnot engine approach 100% efficiency?

and { T }_{ 1 } = temperature of sink source. So n = 1 or 100%, { T }_{ 2 } = 0 K or heat is rejected into a sink at 0 K temperature.

What is the efficiency of a Carnot engine?

The efficiency of carnot’s engine is 50%.

Why is Carnot engine Impossible?

No engine has been built using the cycle named in honor of Carnot because two parts of the cycle require total insulation. And two require conduction with one of either the hot or the cold sinks.

Why is it impossible to design a 100% efficient heat engine?

The efficiency of a heat engine can be 100% only if all the heat energy gets converted into work (or mechanical energy). … Since heat energy can never be transformed completely into mechanical energy, so the efficiency of a heat engine can never be 100 per cent.

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Is Carnot cycle possible?

In real engines, the heat transfers at a sudden change in temperature whereas in a Carnot engine, the temperature remains constant. In our day to day lives, reversible processes can’t be carried out and there is no such engine with 100 % efficiency. Thus, the Carnot cycle is practically not possible.

What is Carnot efficiency formula?

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.

Is Carnot engine a heat engine?

A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. The basic model for this engine was developed by Nicolas Léonard Sadi Carnot in 1824. … In the process of going through this cycle, the system may perform work on its surroundings, thereby acting as a heat engine.

Why is efficiency less than 1?

Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of a machine can never be greater than its input, so the efficiency can never be greater than 1.

What is the formula of 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.