A system such as a hydrogen refueling station and a method are provided. The system includes a cryotank for storing a liquefied fuel having liquid and vapor phases, a pump for providing a first stream of the liquefied fuel in the liquid phase from the cryotank, a heat exchanger for converting at least a portion of the first stream to a gaseous fuel, a dispenser for dispensing at least a portion of the gaseous fuel to a receiving fuel tank, a refrigeration unit integrated with the heat exchanger, and a backup power unit. The refrigeration unit and the heat exchanger exchange heat with each other, and the refrigeration unit provides cooling capacity to a facility of environment where cooling is needed. The backup power unit generate electric power by using a second stream of the liquefied fuel in the vapor phase or in the liquid phase or both.

A pigtail hose is described for connecting a gas canister to a gas regulator. The pigtail hose includes a gas hose having an inlet end and an outlet end; and an elbow fitting connected to the inlet end of the gas hose. The elbow fitting has a bore which turns the gas supply through 90° at a convenient point of the gas supply assembly to assist with the connection of the canister in a confined storage space.

An apparatus for depressurizing a pair of accumulators to provide high pressure gas includes a tank in fluid communication with each one of the pair of accumulators for receiving vapor from the pair of accumulators for storage and dispensing the vapor to a remote location other than the pair of accumulators and external atmosphere, a first fluid connection including a first valve assembly interconnecting the tank and a first accumulator of the pair of accumulators, a second fluid connection including a second valve assembly interconnecting the tank and a second accumulator of the pair of accumulators, wherein the first fluid connection with the first valve assembly and the second fluid connection with the second valve assembly are each constructed and arranged to deliver the vapor from a corresponding one of the first accumulator and the second accumulator to the tank during alternating intervals. A related method and system are also provided.

An apparatus for depressurizing a pair of accumulators to provide high pressure gas includes a tank in fluid communication with each one of the pair of accumulators for receiving vapor from the pair of accumulators for storage and dispensing the vapor to a remote location other than the pair of accumulators and external atmosphere, a first fluid connection including a first valve assembly interconnecting the tank and a first accumulator of the pair of accumulators, a second fluid connection including a second valve assembly interconnecting the tank and a second accumulator of the pair of accumulators, wherein the first fluid connection with the first valve assembly and the second fluid connection with the second valve assembly are each constructed and arranged to deliver the vapor from a corresponding one of the first accumulator and the second accumulator to the tank during alternating intervals. A related method and system are also provided.

An engine-driven cryogenic cooling system for an aircraft includes a first air cycle machine, a second air cycle machine, and a means for condensing a chilled air stream into liquid air for an aircraft use. The first air cycle machine includes a plurality of components operably coupled to a gearbox of a gas turbine engine and configured to produce a cooling air stream based on a first engine bleed source of the gas turbine engine. The second air cycle machine is operable to output the chilled air stream at a cryogenic temperature based on a second engine bleed source cooled by the cooling air stream of the first air cycle machine.

An engine-driven cryogenic cooling system for an aircraft includes a first air cycle machine, a second air cycle machine, and a means for condensing a chilled air stream into liquid air for an aircraft use. The first air cycle machine includes a plurality of components operably coupled to a gearbox of a gas turbine engine and configured to produce a cooling air stream based on a first engine bleed source of the gas turbine engine. The second air cycle machine is operable to output the chilled air stream at a cryogenic temperature based on a second engine bleed source cooled by the cooling air stream of the first air cycle machine.

A liquefied fuel cryogenic tank has an inner jacket delimiting a fluid storage volume and an outer jacket disposed around the inner jacket with a vacuum thermal insulation gap therebetween. A withdrawal circuit has an assembly of one or more valves and a withdrawal line that has a first heating heat exchanger located outside the inner jacket and a second heating heat exchanger located inside the inner jacket. Fluid flows through the withdrawal line via the first heat exchanger and then the second heat exchanger or via the first heat exchanger without entering the second heat exchanger.

A sub-cooler for a sub-cooling cryogenic refueling system is disclosed herein. The sub-cooler includes a first valve to separate flowing cryogenic fuel into a primary flowline and an auxiliary flowline, a second valve to reduce the saturated pressure and temperature of the cryogenic fuel in the auxiliary flowline, a cryogenic heat exchanger to transfer heat from the primary flowline to the auxiliary flowline, a temperature sensor to measure the temperature of the sub-cooled cryogenic fuel in the primary flowline, and a sub-cooler controller to control the effective areas of the primary flowline inlet and the auxiliary flowline inlet at the first valve.

A fluid storage tank can be configured to store a cooling fluid in a liquid state and a gas state. A first heat exchanger can be configured to release heat into the fluid storage tank. A second heat exchanger can be disposed fluidly downstream of the fluid storage tank and configured to exchange heat between the cooling fluid and a heat load. A pressure control device can be disposed fluidly downstream of the second heat exchanger. The first heat exchanger can be fluidly downstream of the second heat exchanger such that cooling fluid, after being heated in the second heat exchanger, passes through the first heat exchanger and thereby heats upstream cooling fluid resident in the fluid storage tank.

A fluid storage tank can be configured to store a cooling fluid in a liquid state and a gas state. A first heat exchanger can be configured to release heat into the fluid storage tank. A second heat exchanger can be disposed fluidly downstream of the fluid storage tank and configured to exchange heat between the cooling fluid and a heat load. A pressure control device can be disposed fluidly downstream of the second heat exchanger. The first heat exchanger can be fluidly downstream of the second heat exchanger such that cooling fluid, after being heated in the second heat exchanger, passes through the first heat exchanger and thereby heats upstream cooling fluid resident in the fluid storage tank.