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Refrigeration is the use of certain methods, in a certain time and space, so that an object or space to achieve than the surrounding medium lower temperature, and maintained at a given temperature range. In order to make an object or space to achieve or maintain a certain temperature, it must adopt certain technical means and methods, and continuously remove the object or space of the heat in the operation, thetechnique called refrigeration technology.

Usually the environmental media objects or absorb heat, and the process of its transfer to higher than ambient temperature heating objects, called heat pump heating. The refrigeration system to absorb heat from the environment medium to high temperatureat the heat discharge, can be alternately or simultaneously realize two functions ofrefrigeration and heating machine known as the cooling and heating pump. From theenergy point of view, this is a kind of efficient use of energy method, both the use ofcold quantity, and make use of the heat. Refrigeration and heat pump cycle is theprinciple and calculation method is similar to the.