Current research projects

Test procedures for electrical components

Reduction of primary noise sources of fans

Certification of efficient air conditioning and ventilation systems through the new "indoor air quality seal" for non-residential buildings

Electrical components in refrigeration circuits

Low Temperature Tribology

Overall System Optimization of Refrigeration Plant Systems for Energy Transition and Climate Protection

Investigation according to DIN EN ISO 14903

Measurement of insulated packaging

Software modules

Measurements on ceiling mounted cooling systems

Calibration leak for the water bath leak test

Lifetime prediction of hermetic compressor systems

Behavior of multiphase cryogenic fluids

Cryogenic liquid piston pumps for cold liquefied gases like LIN, LOX, LHe, LH2, LNG, LAr

Software for test rigs

Performance tests of refrigerant compressors

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Innovative small helium liquefier

EuroNorm GmbH (BMWi)

Dr. Erik Neuber

+49-351-4081-5122

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Liquefaction rates from 10 to 15 l/h

The goal of the R & D project is to explore new innovative ways to develop the functional model of a "helium liquefier for the small liquefaction rate". The development of such a system should cover the still non-existent area of the market.

This liquefier should contain several innovations and technical solutions:

Development of a helium liquefaction system with a liquefaction rate of 10 - 15 liters per hour of liquid helium.
Development of an innovative pre-cooling stage, which works with a mixture of helium and refrigerants as working fluid.
Detailed investigation of an innovative helium cycle within the development of the helium small liquefier with the ability to operate in different operating regimes: helium liquefaction, cooling and temperature stabilization/control.
Operation of the condenser with a liquefaction rate that can be varied over a wide range - between 75% and 100%.

Currently, the functional design of the helium small liquefier is being set up. The figure shows a 3D model of the cold box, in which all heat exchangers and cold valves are mounted. In the upper part of the cold box, two prototypes of low flow helium turboexpanders are mounted. All external components, piping and condenser control system are located on the front of the cold box.

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