Passive Liquid Cooling

In some applications, the air or liquid being used to cool the system is below the temperature of the desired coolant temperature. This gives the possibility of using a cooling strategy that does not employ a refrigeration circuit but depends on heat exchange between the coolant and the medium cooling the system. Such a system is generally simpler than an active cooling system and is more energy efficient. However the temperature of the coolant has to be between 5°C and 10°C higher than the cooling medium.

  • In air-cooled systems, one or more fans drive air over a heat exchanger through which the coolant flows. The control of coolant temperature is achieved by control of the fans or of the coolant flow through the heat exchanger. Such an air - water heat exchanger is a completely independent unit that does not require any additional components to function, but it will heat up the immediate atmosphere and also generate higher levels of noise from the fans.

  • If a source of cooling water is available, a water - water heat exchanger can be used. Typically the cooling water can be a centralised water circuit supplying machines or a raw water supply (e.g. ground or river water). If required a closed loop secondary circuit may be introduced to isolate water that is potentially corrosive to the chiller unit.  The warm water returned from the chiller can then possibly be used for other purposes, reducing overall energy consumption. Water-cooled chillers are more silent and do not require maintenance of the air circuit, but require further components for their function.

  • Some applications require different liquid temperatures for parts of the process. In such cases a mixing unit can be used to generate the fluid at the higher temperature by mixing a cold supply flow with part of the return flow.

Passive liquid cooling products offer a wide range of features, options and customisation possibilities.

  • Electronic temperature control.
    - High-accuracy temperature control e.g. with variable speed fans or motorized fluid control valves
    - Optional control of temperature based on remote sensor e.g. integrated to machine

  • Integrated coolant circuit pump
    - Automatic mechanical pressure control valves if required by application. 
    - Optional speed control for continuous, automatic regulation of pressure or flow. 

  • Provision of several coolant circuits with flow control valves, indicators and sensors for integration of functions in multiple-circuit machines.

  • Chiller enclosure according to customer requirements, e.g. integration into a standard cabinet system, prepared for baying with other enclosures in a machine.

  • Advanced fault monitoring

  • Communication to process by a number of standard protocols - RS-485, Modbus / IO-Link / Ethernet-based

  • Speed controlled fans for noise reduction and high-accuracy temperature control

  • Liquid-liquid heat exchangers with material selection according to properties of liquids used.

    Active liquid cooling (click here)

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