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Thermodynamic Machines
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The thermodynamic machine was first analyzed by Sadi Carnot who in 1824 published his 'Reflections sur la Puissance Matrice du Feu sur les Machines' analyzes how heat can be used to perform work. In principle it is the application of the first law of thermodynamics in which a system in a system circulates heat so that a fraction becomes work. The fraction is called the efficiency of the machine and by the second law of thermodynamics it is limited and all heat cannot be converted to work.
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Carnot cycle for refrigeration
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If the Carnot process is reversed, it can be used to transfer heat using work, which is known as a heat pump. In this case, the diagram is as follows:
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