Following the Montreal Protocol which banned CFCs and HCFCs, and the Kyoto Protocol which sought to establish commitments for the reduction of greenhouse gases, there has been an increased push towards refrigerants with low ozone depleting potential and low global warming potential. This has indirectly promoted the use of ammonia and carbon dioxide as refrigerant options once again. As products are being phased out or restricted by quotas, the requirements for oils are also changing to suit the current market. The use of correct lubrication in a refrigeration system is imperative in its successful operation and optimum performance. The use of oil can facilitate the movement of parts, control wear, reduce friction, absorb and dissipate heat, and seal and protect systems from corrosion. The choice of oil will depend on the installation or application, but, more importantly, the refrigerant and compressor type.
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