Compact chilled water unit for indoor installation with free cooling, adiabatic evaporative cooling and integrated compressor refrigeration system

Cooling systems using chilled water can be found in a wide range of areas: For discharging excess heat from rooms with high thermal loads, for cooling industrial manufacturing processes or for comfort air conditioning of buildings. The units of the Hybritemp 97 and 98 series are optimally adapted to these requirements. The “all-in-one” unit offers efficient cooling in a very compact way. It is generally not necessary for cooling system components to be installed at or on the exterior of the building – and this drastically reduces the overall investment costs. Hybritemp has been developed in two design variants: The COP-optimised 97 series is characterised by its very high efficiency, while the development of the 98 series focussed on achieving maximum performance with minimum space requirements. The combination of first-class components with precise control and regulation systems guarantees economical operation at all times.

Further performance parameters and options:

  • High corrosion prevention through the use of zinc sacrificial anodes, EPDcoated parts and components made from plastic
  • Use of electronic expansion valves
  • Energy-saving EC fans
  • Filtering the air in any operating mode
  • Individually controllable performance parameters
  • Complete unit, ready to connect, contains all structural elements for chilled water generation, including all control and regulation fittings
  • Intensive quality inspection with factory test run


  • Conductivity-controlled elutriation control when using softened water
  • Hot water extraction, to use waste heat for heating purposes
  • Remote maintenance
  • And many more

At a glance:

  • Efficient cooling through the use of natural resources
  • Very high performance with high EER and ESEER values at the same time
  • Reliable cooling, even when outside temperatures are very high
  • Compressor refrigeration system and free cooler optimally adapted to the respective application
  • Compact design thanks to integrated recooling system, removing the need for cooling system components on the facade or on the roof
  • Low air volumes required for heat dissipation
  • Integrated control and regulation system, compatible with all conventional building management systems

Functional description

Free and evaporative cooling

At respective low outside air temperatures and humidity, the heat in the process water is dissipated to the outside air. In order to reduce the outside air temperature further and to increase the cooling capacity, evaporative cooling is activated. In an intermediate heat exchanger, the process water is cooled down to the required flow temperature. The cooling capacity is controlled continuously by varying the air volume flow rate.

Part-load operation with free and evaporative cooling: Compressor refrigeration system condenses in the exhaust air

When outside air temperature and humidity are rising, the amount of heat that can be dissipated by evaporative cooling will reduce. If the process water in the intermediate heat exchanger can no longer be cooled down to the required flow temperature, after-cooling takes place in the evaporator of the integrated compressor refrigeration system. The heat of condensation from the multistage compressor refrigeration system in part-load operation is passed onto the exhaust air.

Free and evaporative cooling in operation under load: Compressor refrigeration system condenses in the exhaust air and secondary circuit

When an increasing part of the total cooling performance is carried out by the compressor refrigeration system, the condensation heat can no longer be passed solely onto the exhaust air. A proportion of the water is directed from the secondary circuit downstream of the intermediate heat exchanger to the water-cooled condenser of the compressor refrigeration system in order to discharge the residual heat of condensation. The controller regulates the condensation pressure in order to operate the chilled water with an optimum EER.

Operation under full load: Cooling by the compressor refrigeration system

If the water temperature in the secondary circuit is higher than the process water temperature, the total cooling capacity required comes from the compressor refrigeration system. Due to the two-stage condensation heat output in the air condenser (desuperheater) to the exhaust air and in the water condenser to the secondary circuit, only a very low air volume is required. Thanks to the upstream evaporative cooling system, low condensation pressures are achieved, which in return lead to a high EER in the compressor refrigeration system.


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