Systems, apparatuses, and methods relating to heat transfer devices having nested layers of helical fluid channels. In some examples, a device for transferring heat includes a set of nested tubular walls and a plurality of helical walls intersecting each of the nested tubular walls to form one or more first channel layers nested with one or more second channel layers. Each of the first and second channel layers includes a plurality of helical fluid channels. A first intake and a first outtake are in fluid communication with one another via the plurality of helical fluid channels of each first channel layer, for flow of a first fluid through the device. A second intake and a second outtake are in fluid communication with one another via the plurality of helical fluid channels of each second channel layer, for flow of a second fluid through the device.

Drawn polymer fibers have internal channels running, at least partially, through the length of the fibers. These fibers may be configured to for use as thermal isolators that can thermally isolate material at the central core of the fiber from the outside environment. In such instances, the channels may be used as insulating channels and/or a heating or cooling fluid can be pumped through the channels to maintain the temperature of the material at the inner core. As another application, the fibers may be used as recuperative, regenerative, parallel-flow, counter-flow, cross-flow or condenser/evaporator heat exchangers. In this case, the channels may be used to direct fluid flow. The fiber may allow for the exchange of heat between fluids in the channels.

A layer for a heat exchanger includes: an inlet; an outlet; an upper sheet; a lower sheet; a fluid flowpath defined between the upper sheet and lower sheet and from the inlet to the outlet; and at least one pin disposed in the flowpath and connecting the upper sheet to the lower sheet; wherein the lower sheet has a first undulating profile. The upper sheet has a second undulating profile different from the first undulating profile. Also disclosed is a heat exchanger including the layer, and a method of making a layer for a heat exchanger.

The monolithic redundant loop cold plate core includes a core structure and a first cooling loop formed in the core structure. The first cooling loop including: a plurality of first cooling loop passageways extending across a heat exchanger core in one or more passes. The one or more passes include at least a first pass. The monolithic redundant loop cold plate core includes a second cooling loop formed in the core structure. The second cooling loop includes: a plurality of second cooling loop passageways extending across the heat exchanger core in the one or more passes. The plurality of first cooling loop passageways are intermixed in an alternating side-by-side arrangement with the plurality of second cooling loop passageways in a single cooling plane. The monolithic redundant loop cold plate core is a single piece including a unitary structure.

A monolithic redundant loop cold plate core includes a core structure and a first cooling loop formed in the core structure. The first cooling loop including one or more first cooling loop passageways extending across a heat exchanger core in one or more passes. The one or more passes include at least a first pass. The monolithic redundant loop cold plate core includes a second cooling loop formed in the core structure. The second cooling loop including one or more second cooling loop passageways extending across the heat exchanger core in the one or more passes. The one or more first cooling loop passageways are intermixed in an alternating side-by-side arrangement with the one or more second cooling loop passageways in a single cooling plane. The monolithic redundant loop cold plate core is a single piece including a unitary structure.

A heat exchanger includes a plurality of fins arranged as a network and delimiting corridors, and an envelope having an internal wall and an external wall, the internal and external walls delimiting between them a channel for a flow of a first fluid in a main direction, the network of fins being arranged in the channel and connected to the internal and external walls, at least one passage for a flow of a second fluid being embedded in at least one of the internal and external walls, the channel being, in the main direction, divergent and then convergent.

A combined combustor and recuperator is formed with the recuperator surrounding the combustor. Cold gas conduits (14, 16, 20) through the recuperator follow along involute paths toward the combustor. Hot has conduits (26) through the recuperator follow counterflow paths along corresponding involute curves outward from the combustor. The openings (18) in the combustion chamber wall through which cold gas enters the combustion chamber may be directed to impart flow direct to the cold gas to support particular desired behaviour of the cold gas in the portions of the combustion chamber concerned, e.g. supporting a stable vortex flame, enhancing mixing, providing a protective barrier layer.

The invention relates to improvements of a heating means particularly in a vertical flow-wrapper.

The invention relates to improvements of a heating means particularly in a vertical flow-wrapper.

An additively manufactured heat exchanger configured to transfer heat between a first fluid and a second fluid includes a first channel with a first wall configured to port flow of a first fluid and a second channel with a second wall configured to port flow of a second fluid. The heat exchanger also includes a barrier channel containing unprocessed build powder provided by the additive manufacturing process and is located between the first wall and the second wall. The barrier channel is configured to prevent mixing of the first fluid and the second fluid when one of the first wall and the second wall ruptures.