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In this chapter is addressed the thematic of refrigerants: its historical evolution; properties; legislation
applied in the area and future trends. The first refrigerant being marketed on a large scale was ethyl
ether (R610), in 1834. Since then, the evolution of the utilized refrigerants was stimulated, initially due
to constructive issues in the refrigeration system and later to environmental issues. This evolution may
be divided into four generations: 1st use of any fluid that worked; 2nd safety and durability of the equipment;
3rd ozone layer protection and 4th increase of global warming concerns. During the process of
evolution many refrigerants were tested to understanding of their properties. Currently, environmental
concerns are taken as guide in the search for new refrigerants. The most promising refrigerants to be
used in future are the HFEs, HFOs and HFCs
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IGI Global