A system comprising: (a) a liquid natural gas compression module having a compressed liquid natural gas conduit; (b) an active magnetic regenerative refrigerator H.sub.2 liquefier module; (c) at least one H.sub.2 gas source fluidly coupled to the active magnetic regenerative refrigerator H.sub.2 liquefier module via an H.sub.2 gas conduit; and (d) a heat exchanger that receives the compressed liquid natural gas conduit and the H.sub.2 gas conduit.

An improved method to manage the flow of heat in an active regenerator in a magnetocaloric or an electrocaloric heat-pump refrigeration system, in which heat exchange fluid moves synchronously with the motion of a magnetic or electric field. Only a portion of the length of the active regenerator bed is introduced to or removed from the field at one time, and the heat exchange fluid flows from the cold side toward the hot side while the magnetic or electric field moves along the active regenerator bed.

Display cabinet for frozen products including a magneto caloric unit having cold end with a primary cold heat exchanger and a hot end with a primary hot heat exchanger, and a cabinet suitable for containing frozen products. The cabinet including an inner wall limiting a volume wherein frozen products can be stored, the cabinet having a secondary heat exchanger, wherein the secondary cold heat exchanger includes an exchanger circulator for circulating a low freezing point liquid between the secondary cold heat exchanger and the primary cold heat exchanger.

This magnetic refrigeration module includes a magnetic refrigeration operation unit which has a magnetic refrigeration material, and extends in a longitudinal direction, and a fixed magnetic field excitation unit and a variable magnetic field excitation unit which are disposed apart from each other in an outer peripheral direction of the magnetic refrigeration operation unit, in which the fixed magnetic field excitation unit applies a fixed magnetic field to the magnetic refrigeration operation unit, and the variable magnetic field excitation unit applies a variable magnetic field to the magnetic refrigeration operation unit when being in an ON state and does not apply the variable magnetic field to the magnetic refrigeration operation unit when being in an OFF state.

A magnetic structure has a magnetocaloric material the temperature of which changes with application or removal of a magnetic field, and a high thermal conduction member which is in contact with the magnetocaloric material and has higher thermal conductivity than the magnetocaloric material. Further, this magnetic air-conditioning and heating device is provided with multiple of the aforementioned magnetic structures, a thermal switch which is arranged between magnetic structures and transmits or insulates heat, and a magnetic field varying unit which applies or removes a magnetic field to each of the magnetic structures. By providing in the magnetic structures a high thermal conduction member with higher thermal conductivity than the magnetocaloric material, some or all of the heat generated in the magnetocaloric material can be quickly conducted in the magnetic bodies.

A cryostat includes a cryogenic refrigerator arranged to cool the interior of a cryogen vessel within the cryostat, the cryogenic refrigerator being arranged inside a refrigerator sock. A pipe is controlled by a passive temperature-sensitive valve to selectively provide a path for cryogen gas flow through the refrigerator sock. The passive temperature-sensitive valve is controlled according to a temperature of the cryogen gas supplied from the refrigerator sock to the passive temperature-sensitive valve.

A refrigeration system includes a refrigeration circuit and a coolant circuit separate from the refrigeration circuit. The refrigerant circuit includes a gas cooler/condenser, a receiver, and an evaporator. The coolant circuit includes a heat exchanger configured to transfer heat from a refrigerant circulating within the refrigeration circuit into a coolant circulating within the coolant circuit, a heat sink configured to remove heat from the coolant circulating within the coolant circuit, and a magnetocaloric conditioning unit configured to transfer heat from the coolant within a first fluid conduit of the coolant circuit into the coolant within a second fluid conduit of the coolant circuit. The first fluid conduit connects an outlet of the heat exchanger to an inlet of the heat sink, whereas the second fluid conduit connects an outlet of the heat sink to an inlet of the heat exchanger.

A method for operating a caloric heat pump system includes changing a cycle frequency at which a field of a field generator is applied to caloric material in the caloric heat pump system. The method also includes adjusting a speed of a hot side fan in response to the cycle frequency change and adjusting a speed of a cold side fan in response to the cycle frequency change. A respective one of three separate control loops changes the cycle frequency, adjusts the speed of the hot side fan, and adjusts the speed of the cold side fan.

A solid-state refrigeration apparatus includes a solid cooling structure, first and second heat exchangers, a heating medium circuit, a reciprocating conveying mechanism, and a thermal storage section. The solid cooling portion includes a solid refrigerant substance, an internal channel where the solid refrigerant substance is disposed, and an induction section configured to cause the solid refrigerant substance to produce a caloric effect. The heating medium circuit is connected to the first and second heat exchangers, and the internal channel. The heating medium heated by the solid cooling portion dissipates heat in the first heat exchanger and the heating medium cooled by the solid cooling portion absorbs heat in the second heat exchanger a heat application operation. Frost on the second heat exchanger is melted using the heat stored in the thermal storage section in a defrosting operation. The thermal storage section stores heat in the heat application operation.

An atmospheric water generator apparatus. In one embodiment, the apparatus includes a fluid cooling device. A water condensing surface is thermally connected to the fluid cooling device, the water condensing surface having a superhydrophobic condensing surface, a superhydrophilic condensing surface, or a combination thereof. An air-cooled heat rejection device is in fluid communication with a fluid cooling device. An air fan is configured to induce airflow across the water condensing surface in order to condense and extract water from the atmosphere.