Refrigeration

Cooling is the process of exclusion of heat from closed space or material by excision it to a different place; For that you need something like air conditioning. The main goal of the cooling is to lower the temperature of the closed space or material and then add and maintain that low temperature. Since heat is following by itself only from material or body with high temperature to a body with low temperature (The second low of thermodynamics, it means that to make heat flow on the opposite direction there is a need to invest Mechanical work.