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National Lab GmbH has its headquarters in the town of Moelln in the state of Schleswig-Holstein and has been a purely German company independent of any corporation since its foundation in the year 1918. Due to the company’s distinct international orientation and its strong reputation in scientific laboratories around the world, it has now become standard practice to pronounce the name in English.
The company concentrates on two core fields of expertise: firstly, cooling water and oil recirculating water chillers for industrial applications and, secondly, refrigeration and deep-freezing technology on the laboratory scale.
National Lab recirculating water chillers are compact, ready-to-install units for cooling liquids within a circuit.
The liquid used is generally water with or without additives and is called a cooling medium on account of its function.
A recirculating chiller essentially consists of a hydraulic part (with heat exchanger, water tank and pump), which is intended to substitute a mains water circuit, and a cooling part.

Heat generated by machinery or equipment is transported via the hydraulic components by pumping the cooling medium through the applications to be cooled.
This method largely uses ambient air. The heat exchanger in the chiller is therefore a water/air heat exchanger.
The nature of the process means that the temperature of the cooling medium cannot be cooled below the temperature of the air.
In an active cooling unit the heat exchanger in the chiller is a refrigerant condenser.
Temperatures for the cooling medium of -10°C to +20°C can be achieved independently of the surroundings.
One feature applies for all cooling options, namely that, when matched with the hydraulic components, they represent a ready-to-install and fully equipped cooling unit. A cooling circuit is thus created without any loss of cooling medium. Apart from the fact that it conserves water resources, the main advantage of a recirculating chiller lies in the fact that constant conditions (temperature, pressure, etc.) are always present for the application to be cooled and there is no gradual impairment of the cooling properties by the permanent precipitation of minerals from fresh water.
Laboratory Water Chillers
Laboratory Water Chillers

National Lab Laboratory Water Chillers are sub divided into 2 main groups. The Minimus Series consist of pump pressure up to 0.75 bar and have maximum cooling output of 500 Watts. As for the Filius series, the pump pressure can be as high as 3 bar and the maximum cooling output model is 2,500 Watts.

Proficool Genius Industrial Recirculating Water Chillers
Proficool Genius Industrial Recirculating Water Chillers

National Lab Industrial Recirculating Water Chillers are mainly divided into two main division. The standard range of water cooling recirculating chillers and the Low temperature of glycol/water mixture recirculating chillers. The cooling Power in these models can be in the range of 1 to 365 kW. There is a wide range of pump choices for these models. Pump pressure can be as low as 3 bar to as high as 8 bar for different applications.

Water-to-Water Heat Exchanger System
Water-to-Water Heat Exchanger System

Water-to-Water Heat Exchanger System

For many cooling applications (e.g. lasers, electron microscopes or x-ray generators, and countless more) the company’s in-house, central cooling water is too cold and/or of insufficient quality. The FlowCool Unicus provides the solution.
It employs a water-to-water heat exchanger system, i.e. a cooling system without an active refrigerating unit.

The application is cooled via its own water circuit (= application cooling circuit) while the dissipated process heat is transferred to the central cooling water supply (= in-house cooling circuit).
The FlowCool Unicus is a cooling system without active refrigeration. The process heat is transferred via a heat exchanger to the central cooling water supply (= in-house cooling circuit).
The application itself is cooled via its own water circuit (=application cooling circuit). This system offers controllable water quality and runs very quietly. For this reason it is popular in laboratories and other working areas.
The FlowCool Unicus can be usefully employed whenever the required or accep-table temperature for the application lies above the temperature of the central cooling water supply.
The benefits at a glance:

  • Correct and constant water temperature.
  • Constant water quality without dirt, lime, algae or rust.
  • Correct and constant water pressure.
  • Extremely quiet, hence suitable for use directly at the workplace.
  • Reliable even at elevated ambient temperatures.
  • No additional heat load at installation site.
  • Extremely low energy consumption compared with circulating chillers.
     
Air-to-Water Heat Exchanger System
Air-to-Water Heat Exchanger System

Air-to-Water Heat Exchanger System

The consumer side of an air-to-water heat exchanger system has the conventional structure with a tank, a pump and also a control system.
In many cooling applications, the task simply involves “drawing” heat from the circuit, without the need to achieve a defined temperature level.
As these units always exploit the naturally occurring potential to the ambient temperature without active refrigeration, the resulting temperature level of the cooling medium is always above the ambient temperature.
On the hydraulic side (= consumer circuit) all the options offered for recirculating chillers are available.