An efficient, leaf-proof system to enhance the efficiency of fuel cell electric vehicle refueling has been engineered at U.S. Southwest Research Institute (SwRI). The linear motor-driven reciprocating compressor (LMRC) prepares the hydrogen by means of a hermetically sealed airtight compressor.The hermetically sealed LMRC is designed to compress hydrogen as a fuel source for hydrogen-powered cars. Source: SwRI

Magnets are shielded from hydrogen incursion and embrittlement by application of protective coatings and leaks are minimized with improved valve designs. A ceramic piston mounted for vertical motion reduces heat expansion and lowers stress on its seal. The design also reduces friction on the system’s seals and bearings, eliminating the need for lubrication as in most reciprocating compressors.

The LMRC is also suitable for deployment in other compression applications to avoid gas leaking into the atmosphere, such as hazardous gas or flare gas recovery operations. The system was successfully demonstrated in 2020 and completed continuous operation at design conditions in mid-to-late 2022. Future iterations are expected to offer additional efficiency and speed gains to increase flow rates in diverse compression applications requiring hermetic sealing.