# You asked: How does Carnot engine work?

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A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. … A heat engine acts by transferring energy from a warm region to a cool region of space and, in the process, converting some of that energy to mechanical work. The cycle may also be reversed.

## What is Carnot engine in thermodynamics?

Carnot engine is a theoretical thermodynamic cycle proposed by Leonard Carnot. It estimates the maximum possible efficiency that a heat engine during the conversion process of heat into work and, conversely, working between two reservoirs can possess.

## Why Carnot engine is not 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.

## Does Carnot engine really 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.

## How do you find the work done by a Carnot cycle?

The total work done by the gas in the Carnot cycle is given by W=W1+W2−W3−W4.

## Why Carnot cycle is the most efficient?

According to the Carnot theorem, the reversible engine will always have a greater efficiency than the irreversible one. … The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature.

## Can the efficiency of Carnot engine be 100?

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. …

## Can we make Carnot cycle engine?

A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. … The system may be worked upon by an external force, and in the process, it can transfer thermal energy from a cooler system to a warmer one, thereby acting as a refrigerator or heat pump rather than a heat engine.

## Why is a heat engine not 100% efficient?

A heat engine is considered to be 100% efficient if only all the heat is converted into useful work or mechanical energy. Since heat engines cannot convert all the heat energy into mechanical energy, their efficiency can never be 100%.

## What do you mean by Zeroth Law of Thermodynamics?

The zeroth law of thermodynamics states that if two bodies are each in thermal equilibrium with some third body, then they are also in equilibrium with each other.

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## What is heat death theory?

The heat death of the universe (also known as the Big Chill or Big Freeze) is a hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.

## How do you work out 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 calculate work done by an engine?

The useful work done by a heat engine is W = Q1 – Q2 (energy conservation). An ideal reversible engine does the maximum amount of work. Any real engine delivers more heat Q2 at the reservoir at T2 than a reversible one and therefore does less useful work.

## What is Lord Kelvin statement?

The Kelvin–Planck statement (or the Heat Engine Statement) of the second law of thermodynamics states that it is impossible to devise a cyclically operating heat engine, the effect of which is to absorb energy in the form of heat from a single thermal reservoir and to deliver an equivalent amount of work.