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Methods of refrigeration
Refrigeration methods can be broadly classified as Cyclic, Non-cyclic and Thermoelectric methods. In non-cyclic method, refrigeration is done by melting ice. It is used in small-scale refrigeration systems such as portable coolers, and laboratories. Dry ice or solid carbon dioxide is also used as a refrigerant. As dry ice has no liquidity at normal temperature, it sublimes directly from solid state to vapor state at a temperature of -78.5 °C. Dry ice is mostly used and is effective for maintaining products at lower temperatures while subliming. Ice maintains a constant melting point of 0 °C and melts when 333.55kJ.kg of heat is absorbed. Food products maintained at this temperature have a much longer shelf life.
Air conditioner
The process of Refrigeration is simply eliminating heat and maintaining a low temperature either from an enclosed space or thing. Refrigeration is primarily used to substantially decrease temperatures anywhere. Air conditioning and air cooling are synonymously used with refrigeration and is any method where heat is driven away. Initially refrigeration is born with the concept that rather than addition of more coldness, it is wise to remove heat, which culminates in chilly temperatures automatically. According to the second law of thermodynamics, work must be done to accomplish this. Mechanical work, Laser and magnetism are the means of this. To dispel heat, three methods namely convection, conduction and radiation are used in refrigeration.
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