Configuration

Systems can be configured for re-liquefaction capacities ranging from approximately 10 kg/day to more than 2.000 kg/day, allowing solutions to scale from small research installations and fueling stations to large hydrogen storage and distribution facilities. For ease of installation and integration, complete hydrogen re-liquefaction systems can be delivered in containerized packages, enabling rapid deployment and simplified site integration.

These systems can be integrated with existing liquid hydrogen storage tanks or incorporated into new hydrogen storage installations, providing flexibility for both retrofits and greenfield hydrogen infrastructure projects.

Eliminating Hydrogen Losses

Instead of venting boil-off hydrogen to maintain tank pressure, a Stirling re-liquefaction system actively re-liquefies the hydrogen vapor caused by both tank insulation losses as well as operational losses back into liquid form.

This approach offers several advantages:

1. Zero or near-zero hydrogen losses from storage tanks
2. Reduced operating costs by recovering product that would otherwise be vented
3. Improved safety by minimizing hydrogen release
4. Stable tank pressure management without flaring or venting

Modular and Redundant Cryogenic Cooling

Re-liquefaction can be achieved in two ways depending on the installation:

1. Direct re-liquefaction of cold boil-off gas: hydrogen vapor is liquefied in the Cryogenerator and returned to the storage tank
2. Indirect cooling through a closed helium loop: cryogenic cooling is transferred from the Stirling Cryogenerator into a storage tank heat exchanger using a flow of helium gas, creating in-tank cooling and liquefaction with no need for H2 transfer

These systems are modular and can be configured with multiple Cryogenerators operating in parallel. Each unit operates independently, allowing one or more Cryogenetators to be offline as needed. This modular approach enables systems to maintain redundancy, scale easily, and control capacity with ease.

Efficient Hydrogen Infrastructure

As liquid hydrogen storage and transport become more common in the transition to a low-carbon energy system, controlling boil-off losses is increasingly important. Stirling Cryogenics re-liquefaction systems provide an energyefficient solution that allows operators to:

1. Maintain liquid hydrogen inventory
2. Reduce or eliminate product loss during storage and operation
3. Enable long-duration LH2 storage
4. Improve the economics of hydrogen distribution and fueling infrastructure

By transforming boil-off gas back into usable liquid hydrogen, Stirling Cryogenics technology supports more efficient, sustainable hydrogen handling across research facilities, industrial storage sites, and emerging hydrogen energy applications.