A major application of heat-transfer fluids is their use as heating or cooling agents in chemical reactions. The following table lists some typical examples.
|Supply of process heat and removal of process heat (cooling)|| Condensation reactions|
|Purification and separation processes|| Distillation|
|Melting-on processes||Wire coating|
|Preheating of reactants|| Preheating air in oxidation processes|
Preheating products in thermal cleavage reactions
|Energy recovery||From waste gases in cleavage and combustion processes and in waste-gas purification|
Recently, energy conservation has become an area of interest. This has led to an expansion in the fields of application of heat-transfer fluids with higher load capacities. As a result, the heat content from waste gases out of blast heating apparatuses can be fed back into the process via a heat-transfer medium circuit to preheat the fuels and fuel air. Energy-saving designs in power plants, usually in the flue gas dust collection system, function in an analogous fashion via recuperative heat-displacement systems. In solar power stations the organic heat-transfer fluids gained access to a completely new technology at operating temperatures of 300 to 350°C.