That is, cold, also known as freezing, the object temperature reduced to or maintained below the natural environment temperature. There are two ways to achieve refrigeration, one is natural cooling, the first is artificial refrigeration. Natural cooling uses natural ice or deep well water to cool objects, but their cooling capacity (i.e. heat removed from the cooled object) and the possible cooling temperature often do not meet production needs. Natural cooling is a heat transfer process. Artificial refrigeration is a kind of thermodynamic process that uses refrigeration equipment to add energy and transfer heat from a low-temperature object to a high-temperature object.
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