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Secondary Circuit Systems

Systems for the use of primary energy from -150 up to 400 °C

Secondary circuit systems make use of thermal energy from existing steam, thermal oil, cooling water and cooling brine networks. The control facilitates the automatic extraction of the energy required for heating and cooling from the primary system (via heat exchanger or by the direct injection of the heat transfer fluid).

Application examples

  • Exploitation of existing sorts of primary energy, such as thermal oil, steam, cooling brine and cold oil
  • Temperature control of stirrer tanks
  • Temperature control of reactors in chemistry, pharmacy and biotechnology
  • Use in materials testing, research and production
  • Temperature control of heat exchangers and evaporators


LAUDA HKS brochureDownload a PDF
of our HKS brochure:

LAUDA HKS Brochure (9.5 MB)





Module Configurator

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  The TR advantages Your benefits
  • Digital temperature controller
  • Control of the outflow temperature or the consumer/product temperature
  • Temperature program/ramp mode
  • External setpoint adjustment via Profibus, Modbus or other interfaces
  • Preselection of heating and cooling times
  • Control accuracy ±0.1 °C

  • Heat exchanger in stainless steel or titanium for heating with steam
  • Use of steam supplied by customer
  • Optimal design for type, material and operating conditions as well as usable heat transfer area
  • Transfer of high heating power

  • Heat exchanger in stainless steel or titanium in flange version
  • Use of different primary media
  • Hermetic version without seals
  • Saves on energy costs
  • Fast change of temperature control
  • Large selection of media
  • No mixing with other media

  • Direct media coupling
  • No power loss when using same medium in the primary system
  • No expansion tank needed
  • More economically priced

  • Complete system test in LAUDA Test Bed before shipment; system with CE label
  • Functional testing of all components and checking of all set values
  • Pressure/leakage test with the heat transfer fluid
  • Test of control cabinet and control accuracy
  • Production of a test protocol; documentation of the tests carried out
  • Hot and cold runs with the heat carrier at maximum and minimum operating temperatures
  • Systems quickly ready for operation, short commissioning times
  • Avoidance or prevention of leakage
  • Verification of control accuracy and high-precision processes
  • Check of all performance verifications

Series TR Secondary Circuit Systems

Secondary circuit systems use existing energy sources, such as steam, cooling water and brine – so-called primary systems. Here, the objective is to integrate the existing infrastructure and best possible use of the thermal energy on the primary side. In this way only a single heat transfer fluid circuit is used (single fluid system) on the consumer instead of steam, cooling water and brine circuits. Important advantages arise through the use of only one heat transfer liquid: due to the seamless and reproducible temperature control throughout the whole temperature range changeover to different media is not required. Through the use of thermal oil low operating pressures prevail and the heat carrier also acts as a separating medium between the product and the environment.




Series KP Secondary Circuit Systems

In order to achieve still higher levels of purity in modern production methods, reactions are run at very low temperatures. The range of modules from LAUDA includes the Kryopac for this application. Here the cooling power of evaporating nitrogen is exploited and transferred to a liquid heat transfer fluid. Kryopac systems are secondary circuit systems which are cooled with liquid nitrogen on the primary side. For these extreme cooling applications only special low temperature heat transfer fluids are used. LAUDA developed a special technique to solve the known freezing problems. A suitable intermediate medium transfers the cooling of the low temperature nitrogen (-196 °C) to the heat transfer fluid, controlled accurately to the degree. For this innovative method LAUDA received the European Patent No. 1 030 135.

Series TR (all systems can also be supplied with explosion protection.)

Technical features TR 150 TR 250 TR 350 TR 400 TR 600
Heat transfer fluid Water, water/glycol, thermal oil, special liquids
Working temperature min. °C -100 -100 -100 -100 -100
Working temperature max. °C 400 400 400 400 400
Feed pump pressure capacity max. m3/h 2 12 50 100 180
Thermostatic functions   H (Heating) / K (Cooling) / T (Chilling) / Ts (Ultra-Chilling)
Primary energy   Electrical, steam, hot oil, hot water, air, cooling water, brine, cold oil, nitrogen
Energy transfer   indirectly via heat exchanger or electric heater, direct coupling

Series KP (all systems can also be supplied with explosion protection.)

Technical features KP 150 KP 250 KP 350 KP 400 KP 600
Heat transfer fluid Thermal oil, special liquids
Working temperature min. °C -150 -150 -150 -150 -150
Working temperature max. °C 280 280 280 280 280
Pump flow rate m3/h 0.5…2 2…4 4…10 10…30 30…80
Heater power kW 3…6 9…12 18…50 60…100 120…500
Cooling output at -100 °C kW up to 5 up to 10 up to 15 up to 30 up to 80
Dimensions Wx D x H min. mm 500x1000x1500 600x1500x1500 800x1700x1500 1000x1500x1900 1500x2200x2000
Dimensions Wx D x H max.* mm 600x1500x1500 800x1700x1500 1000x1500x1900 1300x1900x2000 2000x2500x2000

* For versions with more powerful modules