Heat transfer fluids, thermal oils, circulating coolants, and heater liquids are used to carry thermal energy in process heating and machine cooling applications.
Primary refrigerants use a thermodynamic or adiabatic process (evaporation-condensation cycles) to remove heat and cool a region. Secondary refrigerants such as antifreeze liquids provide cooling solely through heat transfer.
Synthetic oils, greases and lubricants are based on synthetic compounds such as silicone, polyglycol, esters, digesters, chlorofluorocarbons (CFCs) and mixtures of synthetic fluids and water.