Refrigeration Cycle

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Refrigeration cycle
A sequence of thermodynamical processes whereby combust is withdrawn from a cold body and expelled to a impetuous body. Theoretical thermodynamic cycles consist of nondissipative and frictionless processes. For this reason, a thermodynamic cycle undersurface be operated in the forward delegacy to produce mechanical power from cacoethes energy, or it can be operated in the reverse direction to produce horniness energy from mechanical power. The reversed cycle is employ in the main for the cooling effect that it produces during a portion of the cycle and so is called a infrigidation cycle. It may also be utilise
In the refrigeration cycle a substance, called the cold, is compressed, cooled, and then expanded. In expanding, the refrigerating absorbs heat from its surroundings to provide refrigeration. After the refrigerant absorbs heat from such a source, the cycle is repeated. Compression raises the temperature of the refrigerant above that of its natural surroundings so that it can make believe up its heat in a heat money changer to a heat sink such as transfer or water. Expansion lowers the refrigerant temperature below the temperature that is to be produced intimate the cold compartment or refrigerator. The sequence of processes performed by the refrigerant constitutes the refrigeration cycle.



When the refrigerant is compressed mechanically, the refrigerative action is called mechanical refrigeration.
There atomic number 18 many methods by which cooling can be produced. The methods intromit the noncyclic melting of ice, or the evaporation of volatile liquids, as in local anesthetics; the Joule-Thomson effect, which is used to liquefy gases; the reverse Peltier effect, which produces heat flow from the cold to the hot junction of a bimetallistic thermocouple when an external emf is imposed; and the paramagnetic effect, which is used to reach extremely low temperatures. However, large-scale refrigeration or cooling, in general, calls for mechanical refrigeration acting in a closed system.
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