2. Water and brine
2.1 Water
Water is the most widely used heat transfer medium: in fact, it's the most interesting medium whenever temperatures above 0°C can be accommodated.
In cases where parts of the refrigerant-carrier circuit have temperatures below 0°C (the "coldest" parts of the circuit are the evaporator walls), only aqueous solutions containing a component that helps lower the freezing point can be used: this is the case for many organic or inorganic salts.
2.2 Main salts used in brines
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Water and brine
Water-alcohol and water-ammonia mixtures
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