Question

What is a carnot engine ?

Answer 1

Sadi Carnot was a French scientist who coined the term "Carnot cycle" to describe a heat engine hypothesis. Carnot engine is an engine that is found in your refrigerators and air conditioners. Physical laws allow for the Carnot engine cycle to be the most powerful heat engine cycle.

Complete answer:
A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. In heat engines, the Carnot cycle is a perfect cyclical series of variations in temperatures and pressures of a fluid, such as a gas used in an automobile, devised by the French engineer Sadi Carnot in the early nineteenth century. It is used as a performance standard for all heat engines that operate between high and low temperatures.

Leonard Carnot suggested the Carnot engine to be a theoretical thermodynamic cycle. It gives an estimation of a heat engine's highest potential performance during the transfer of heat to work and vice versa, when operating between two reservoirs.Furthermore, the performance of this type of engine is unaffected by the operating substance's composition and is solely determined by the temperature of the hot and cold reservoirs.

The Carnot engine principles apply only to cyclical devices such as heat engines, and they state that:
-An irreversible heat engine's efficiency is always lower than that of a reversible heat engine running within the same two reservoirs.
-Both reversible heat engines working within the same two reservoirs have the same performance.

Note: As all engines are mostly made up of different metal alloys, the steel used in them and their parts can be recycled. Cast iron, alloy and structural steels, and aluminium alloys are the most significant structural components in $4$ -stroke engines.