A heat exchanger includes a first fluid pathway enclosed in a heat exchanger body to convey a first fluid through the heat exchanger body and a second fluid pathway enclosed in the heat exchanger body to convey a second fluid through the heat exchanger body and facilitate thermal energy exchange between the first fluid and the second fluid. The first fluid pathway and the second fluid pathway together are arranged in a spiral arrangement extending along a central axis of the heat exchanger.

A heat exchanger includes a first fluid pathway enclosed in a heat exchanger body to convey a first fluid through the heat exchanger body and a second fluid pathway enclosed in the heat exchanger body to convey a second fluid through the heat exchanger body and facilitate thermal energy exchange between the first fluid and the second fluid. The first fluid pathway and the second fluid pathway together are arranged in a spiral arrangement extending along a central axis of the heat exchanger.

A heat exchange system includes a first heat exchanger subassembly, a second heat exchanger subassembly, a first nozzle configured to spray fluid at the first heat exchanger subassembly, and a second nozzle configured to spray fluid at the second heat exchanger subassembly. The heat exchange system further includes memory storing controller-executable instructions and a controller configured to execute the instructions, which cause the controller to activate the first nozzle when an outdoor temperature is below a threshold temperature, and activate the first nozzle and the second nozzle when the outdoor temperature is above the threshold temperature.

A heat exchange system includes a first heat exchanger subassembly, a second heat exchanger subassembly, a first nozzle configured to spray fluid at the first heat exchanger subassembly, and a second nozzle configured to spray fluid at the second heat exchanger subassembly. The heat exchange system further includes memory storing controller-executable instructions and a controller configured to execute the instructions, which cause the controller to activate the first nozzle when an outdoor temperature is below a threshold temperature, and activate the first nozzle and the second nozzle when the outdoor temperature is above the threshold temperature.

A method of constructing a heat exchanger includes providing a base, and additively manufacturing a plurality of first walls substantially parallel and substantially vertical while being manufactured, wherein the plurality of first walls are spaced apart and attached to the base. The method also includes removing at least a portion of a build powder located between the plurality of first walls and attaching a parting sheet to the plurality of first walls. The method also includes additively manufacturing a plurality of second walls substantially parallel and substantially vertical while being manufactured and are spaced apart.

Contactor structures are provided that can allow for improved heat management while reducing or minimizing the potential for contamination of process gas streams with heat transfer fluids. The contactor structures can include one or more sets of flow channels for process gas flows, such as gas flows introduced to allow adsorption of components from a gas stream or gas flows introduced to facilitate desorption of previously adsorbed components into a purge gas stream. The process gas flow channels can correspond to flow channels defined by a structural material of unitary structure. The unitary structure can correspond to the entire contactor, or the unitary structure can correspond to a monolith that forms a portion of the contactor. The contactor structures can also include one or more sets of flow channels for heat transfer fluids. The heat transfer flow channels can also be defined by the structural material of a unitary structure.

There is disclosed a heat exchanger comprising a first channel, for communicating between a first channel inlet and a first channel outlet, a second channel for communicating between a second channel inlet and a second channel outlet, a third channel for communicating between a third channel inlet and a third channel outlet, a first conduit interconnecting the first channel and the third channel, and thereby defining a first group of interconnected channels, the first conduit extending through the second channel.

There is disclosed a heat exchanger comprising a first channel, for communicating between a first channel inlet and a first channel outlet, a second channel for communicating between a second channel inlet and a second channel outlet, a third channel for communicating between a third channel inlet and a third channel outlet, a first conduit interconnecting the first channel and the third channel, and thereby defining a first group of interconnected channels, the first conduit extending through the second channel.

A method of manufacturing a cold plate includes forming a fluid circuit on a build surface in a layer-by-layer fashion from a build material. The fluid circuit includes a plurality of peripheral walls, each of the plurality of peripheral walls at least partially defining a primary channel, a longitudinally one of the peripheral walls being formed to include apertures configured to permit excess build material to pass therethrough. A central wall of the fluid circuit at least partially defines the primary channel and a plurality of secondary channels fluidly connected to the primary channel. The method further includes removing excess build material through the apertures.

Disclosed herein is a BOG reliquefaction system for LNG vessels. The BOG reliquefaction system includes a compressor compressing BOG, a heat exchanger cooling the compressed BOG by exchanging heat between the compressed BOG and BOG used as a refrigerant, and an expansion unit for expanding the BOG having been cooled by the heat exchanger, wherein the heat exchanger includes a core, in which heat exchange between a hot fluid and a cold fluid occurs, the core including a plurality of diffusion blocks, and a fluid diffusion member diffusing a fluid introduced into the core or a fluid discharged from the core.