An apparatus and process for cooling down a liquid hydrogen or other cryogenic fluid pump can be configured to allow for a quick startup that also helps minimize hydrogen losses. Some embodiments can utilize a blow-by circuit configured and arranged to support the cryogenic cooldown operation for the pump that can minimize hydrogen loss while allowing substantially improved pump startup times. Some embodiments can utilize at least one temperature sensor to monitor temperature and an adjustable control valve that can facilitate the flow of the fluid utilized to perform the cooldown of the pump.

Device for pumping liquid hydrogen including, arranged in series between an inlet for fluid to be compressed and an outlet for compressed fluid, a first compression member with a piston forming a first compression stage and a second compression member with a piston forming a second compression stage. The first compression member compresses the liquid hydrogen to a supercritical state. The second compression member compresses the supercritical hydrogen from the first compression member to an increased pressure, in particular, between 200 and 1000 bar.

A portable, cryogenic fluid pump apparatus with associated instrumentation, conduit legs and accessories, are optimally configured on a modular supporting platform for plug and play installation at a filling station and on-site inspection and maintenance at the filling station. Each of the associated instrumentation, conduit legs and accessories are positioned onto a condensed footprint such that access to the platform is possible. The plug and play connection system allows for the rapid connection or disconnection of the various instrumentation, conduit legs and accessories on the modular supporting platform to a vaporizer and a source tank at a filling station. The connections or disconnections may be made safely, quickly and, easily in advance.

A pump arrangement for providing a saturated or subcooled liquid includes a tank for saturated liquid, a heat exchanger for cooling the saturated liquid, a pump, an expansion valve, and an output for feeding saturated or subcooled liquid to a consumer. A tank outlet is in fluid communication with a liquid inlet of the heat exchanger, such that saturated liquid stored inside the tank can flow into the heat exchanger designed to sub-cool the saturated liquid. A liquid outlet of the heat exchanger is in fluid communication with a pump inlet. The expansion valve outlet is in fluid communication with a coolant inlet of the heat exchanger. An expansion valve inlet is arranged for receiving and expanding a fraction of liquid flowing through the pump arrangement and routing it into the coolant input to at least partially evaporate and receive evaporation enthalpy of the liquid to be subcooled.

The invention relates to a hydrogen compressor (10) with metal hydride comprising: a pressure chamber (20), comprising an inner space, defined by a first inner surface (21); a shell (70) with a thickness E, the shell (70) comprising a first outer surface (71) facing the first inner surface (21), the shell (70) comprising an insulating material with first thermal conductivity; and a hydrogen storage element (50), contained in the shell (70), comprising a storage material suitable for storing or releasing hydrogen as a function of a temperature that is imposed on same, and having a second thermal conductivity higher than the first thermal conductivity.

A fuel cell system includes a fuel cell stack, a hydrogen supply source, a hydrogen flow passage, a hydrogen recirculation passage, and a hydrogen circulation pump configured to recirculate emission gas containing hydrogen from the fuel cell stack through the hydrogen recirculation passage. The hydrogen circulation pump includes a pump body, a motor, and a housing. The housing internally includes a merge portion that merges the hydrogen recirculation passage with the hydrogen flow passage. The hydrogen flow passage includes a bypass passage that bypasses the merge portion by branching from a portion of the hydrogen flow passage between the hydrogen supply source and the merge portion. The hydrogen flow passage or the bypass passage includes an open degree control valve configured to control a flow rate of hydrogen flowing through the hydrogen flow passage and the bypass passage.

The hydrogen compressing system has a first unit that receives hydrogen at low temperature and low pressure and compresses it, a second unit that cools down the hydrogen received from the first unit and a third unit that heats up and pressurizes the hydrogen received from the second unit; the high-pressure hydrogen is stored in a tank and afterwards may be supplied, for example, to a tank of a vehicle; pressurization at the third unit (300) is achieved by introducing cold hydrogen gas, well below ambient temperature, received from the second unit into the tank and heating it while the tank is closed preferably till when the hydrogen inside the tank reaches ambient temperature; heating-based compression allows to easily obtain high pressure through a relatively simple system and without risk of reducing the purity of the hydrogen.

A pumping mechanism is disclosed. The pumping mechanism may include a barrel formed of a barrel substrate and including a first end surface, a second end surface opposite the first end surface, and a bore between the first and second end surfaces. Each of the first and second end surfaces and the bore is coated with a metal plating. The pumping mechanism may further include a plunger formed of a plunger substrate and configured to be slidably disposed in the bore in barrel, the plunger substrate having a tribological coating.

A method and system are described for a gas booster, preferably for use with hydrogen. A linear actuator can provide compression in first and second compression vessels. The liner of the compression vessels can be placed in compressive stress so that any cracks that form do not spread. Compressive stress can be applied using, at least, a shrink fit process or a wire wrapping process. The compressive stress will help the inner liner to resist fatigue and cracking due to pressure cycling and corrosion by materials being compressed in the compression vessels. This also protects the chamber jacket from wear and tear.

A fluid energy machine, comprising a crank drive (A) and a drive device which is mechanically connected to the crank drive, wherein the drive device has two electric motors, the respective output members of which are mechanically connected to the crank drive is disclosed. The fluid energy machine is arranged within a housing which seals the fluid energy machine with respect to the surroundings and which is connected to a pressure-holding system. A method for operating a fluid energy machine of this type is further disclosed.