Described herein are systems and methods for cryogenic fluid delivery to achieve the lowest reasonable saturation pressure while dispensing a cryogenic fluid such as liquefied natural gas to a holding tank on a use device. The systems and methods utilize a liquid nitrogen component and a liquefaction engine, very cold liquefied natural gas and a liquefaction engine, or a combination of both very cold liquefied natural gas and a liquid nitrogen component to deliver LNG to a holding tank on a use device.

The invention relates to a pressure vessel comprising a heat exchanger for a cryogenically stored medium, especially for use in a motor vehicle, especially for use as a pressure tank for hydrogen. Said pressure vessel includes a cylindrical jacket and rounded-off end faces which are rolled onto the ends of the jacket and which have centrally arranged openings closed by welded-in inserts, at least one first insert having filling and removal devices. The invention is characterized in that the inserts form bearings on which at least one in-tank heat exchanger is mounted.

A cryogenic tank system includes a plurality of heat exchangers for heating an interior volume of a storage container. Heat transfer to the interior volume of the storage container by the plurality of heat exchangers pressurizes the interior volume of the storage container. The system further includes a valve assembly mounted to the storage container and positioned substantially within the storage container. The valve assembly includes an inlet portion and an outlet portion. The outlet portion is positioned outside of the storage container, and the inlet portion is positioned within the storage container. The inlet portion is sealable by a fail-closed powered sealing mechanism.

A hydrostatically compensated compressed air energy storage system may include an accumulator disposed underground, a gas compressor/expander subsystem in fluid communication with the accumulator interior via an air flow path; a compensation liquid reservoir spaced apart from the accumulator and in fluid communication with the layer of compensation liquid within the accumulator via a compensation liquid flow path; and a first construction shaft extending from the surface of the ground to the accumulator and being sized and configured to i) accommodate the passage of a construction apparatus therethrough when the hydrostatically compensated compressed air energy storage system is being constructed, and ii) to provide at least a portion of one of the air flow path and the compensation liquid flow path when the hydrostatically compensated compressed air energy storage system is in use.

Apparatus and methods maintain constant composition of multi-component liquefied gas mixtures (e.g., for battery electrolytes or refrigerants) during dispensing by transferring vapor from a second container to a first to compensate for selective evaporation. Embodiments use heating, constant pressure cylinders, pumps, or cycled intermediate cylinders, with sensors for control. Systems enable full utilization with minimal waste, scalable for industrial applications.