Can be designed both as cooling and as heating systems.
Secondary circuits are used in places where the temperature control of individual consumers is required. The individual temperature control of consumers by secondary circuits is a constantly economical solution if the individual consumers do not have equal heating requirements at the same time. A heat carrier circulating around the circuit (e.g. thermal oil, water or coolant) is run alongside the thermal consumers where it transfers its heat before being subsequently pumped back to the heat generator.
The use of secondary circuits facilitates a very precise temperature regulation for technological processes.
The secondary circuits are used in many industries for functions such as the press heating of calendar rollers, galvanic baths, the temperature control of indirectly heated hot water or steam generators, in controlling the temperature of heat exchangers and bitumen tank systems.