In refrigeration, cold temperatures can not change by itself. Here there should be a process of cooling the engine work was to produce temperatures as cold as desired. In the refrigeration necessary substance that evaporated as cooling material. This material is used to obtain a cooling effect. This substance is called a cooling material. Cooling material can be liquid, gas, or solid. In general, the cooling material is a substance yarg work as a fluid moving in the cooler and circulates through the functional components, thus obtaining dengai cooling effect by absorbing heat through expansion and evaporation. Very diverse types of coolants. Each type of cooling agents have different characteristics. There are requirements that need to be met to select the cooling material that is safe to use. The nature of the required cooling agents are as follows.
1 Must be volatile or have a low boiling point.
2 can absorb latent heat as much as possible.
3 Non-toxic and explosive.
4 Not combustible.
5. not react with lubricating oil.
6. not react with the material of copper pipe components.
7 Not contaminated with foodstuff in case of leaks.
8. evaporation pressure must be higher than atmospheric pressure.
9 Easy to detect if it is leaking.
10 Having a stable chemical structure, so there is no chemical change in the elements, even if used over and over again.
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