For liquefaction of hydrogen, the two-stage Stirling Cryogenerator is used to reach a temperature of 20 K. This Cryogenerator is available as 1-cylinder machine for liquefaction of 5 kg/day and as 4-cylinder machine for 30 kg/day. Integrating multiple parallel 4-cylinder machines LH2 systems up to 200 kg/day are assembled fitting in a 40 feet container.

Using multiple liquefiers in one system offers the advantage of redundancy. The design concept of the larger Stirling systems is that all Cryogenerators will run independently from each other. Should one of the Cryogenerators be off-line, the liquefaction capacity of the other machines remains available.

A Stirling Cryogenics LH2 system will include all necessary internal piping, instrumentation, catalytic ortho-para conversion, a transfer vessel and system control. All systems are built according ATEX or other relevant coding.

Optionally, containerization and GH2 inlet gas purification can be offered. Alternatively, Stirling Cryogenerators can be supplied as modules to a system integrator building the total system.

Besides the production of LH2 from gas production, the two-stage Stirling Cryogenerator can also be used as a re-liquefier for boil-off gas coming from a storage tank preventing the blow-off of cold GH2. This can be achieved either by direct re-liquefaction of the cold gas, or by a cold He loop transporting cooling power from the Cryogenerator into the storage tank.