refrigeration oil

Definition. The refrigeration oil serves as a hydraulic control, functional fluid and lubricating oil in refrigeration compressors under the influence of the refrigerant.The lubrication of refrigeration compressors occupies a special position in lubrication technology. The longevity expected of refrigeration compressors is closely connected to the high quality which is required of refrigeration oils. The interaction with other substances which the refrigeration oil comes into contact with, and especially the extremely high and low temperatures, makes very specific demands on refrigeration oils.

The principal function of a compressor oil is to lubricate the pistons or rotors and to lubricate and seal the valves and, in some cases, the slip ring seals. Furthermore, the refrigeration oil must dissipate heat away from hot compressor components and assist in sealing the compression chambers and valves. The refrigeration...

The Quenching Process

When heat treatment fluids are used to quench metals, cooling occurs in three distinct stages: film boiling, nucleate boiling and convective heat transfer.

How does a refrigeration system work?

The most common refrigeration cycle is accomplished by circulating, evaporating, and condensing the refrigerant in a closed system. Evaporation occurs at low temperature and low pressure while condensation occurs at high temperature and high pressure. This makes it possible to transfer heat from an area of low temperature to an area of high temperature. An overview of this refrigeration cycle is shown in Figure 1.