Aktuelle Forschungsprojekte

Image Verification of storage suitability of cryo tubes
Image Software for test rigs
Image Innovative Manufacturing Technologies for Cryosorption Systems
Image Overall System Optimization of Refrigeration Plant Systems for Energy Transition and Climate Protection
Image Mass Spectrometer
Image Software modules
Image Combined building and system simulation
Image Measurement of insulated packaging
Image IO-Scan - Integral measuring optical scanning method
Image Certification of efficient air conditioning and ventilation systems through the new "indoor air quality seal" for non-residential buildings
Image Micro heat exchangers in refrigeration
Image High temperature heat pump
Image Swirl-free on the move...
Image Investigation of coolants
Image Optimizing HVAC operation with machine learning
Image Investigation according to DIN EN ISO 14903

You are here:   /  Home


High Capacity Pulse Tube Cooler

Industry and Research Institutes

Gunar Schroeder

+49-351-4081-5129

for Cryogenic High-Power Applications

Within the framework of the research project "Supraconducting High Current System for DC Applications", a high power cryocooler based on the pulse-tube (PT) principle was developed. The single-stage design has two pressure wave generators with a common drive, see Fig. 1. Unlike a classic PT cooler with orifice and buffer volume, the phase relation between pressure and mass flow can be fixed by the angle of rotation of the two pressure wave generators. This technique is called "active phase shift". This allows a much higher efficiency to be achieved, since the expansion energy at the warm end of the pulse tube is not dissipated but recuperated.

The cold head of this PT cryocooler is specially adapted to the application as a recooler / condenser. The cold surface is designed as a heat exchanger in order to be able to connect the media to be cooled directly to it. This enables optimum heat transfer between the internal thermodynamic process and the medium to be cooled, e. g. LN2. Due to its special design, the PT cryocooler requires no valves and no moving parts in the cold section. This ensures a long service life, high reliability and low maintenance.
This PT cryocooler (high power cryocooler) is particularly suitable for use as:

  • Cooler for small condensers, e. g. for the condensation of O2, N2, H2, etc.
  • Recooler for cryogenic cooling circuits with LN2 or Lar, e. g. for HTC (High Temperature Superconductor) applications

The advantages of the system are:

  • High efficiency
  • Long service life and reliability with low maintenance requirements
  • Special system solution with heat exchanger and process connections integrated in the cold surface
  • Adaptability of the cryocooler to various special requirements
  • Adjustable cooling capacity via the revolution speed of the compressor

In the present configuration with the single-stage structure, a low temperature of 60 K is achieved. The cooling capacity is 300 W at 80 K. The temperature stability of the system was proven in an endurance test, see Fig. 2. Further modifications are planned to increase efficiency and cooling capacity. In addition, the pressure wave generators are to be further adapted in order to further reduce the dimensions of the system.

Wir suchen Kunden und Projektpartner für mögliche Weiterentwicklungen oder auch Adaptionen für spezielle Anwendungszwecke. Denkbar sind zum Beispiel ein kompakteres System oder eine Weiterentwicklung des derzeitigen Kühlers zu noch mehr Kälteleistung, tieferen Temperaturen und höherer Effizienz.


Your Request

Further Projects

Image

Thermal engines

Power Generation from Waste Heat

Image

Helium extraction from natural gas

Innovative solutions for helium extraction

Image

Ice Slurry Generation

Using Direct Evaporation

Image

Pulse-Tube-Refrigerator with sealed compressor

for mobil use in the hydrogen technology

Image

Low Temperature Measuring Service

Measurement of Thermal Properties at Low Temperatures