A heat exchanger including a stack of plates spaced apart in such a way as to present an assembly of intermediate spaces allowing a fluid circulation between the plates. The assembly of intermediate spaces including a plurality of intermediate multi-fluid spaces each intended for circulation of a plurality of fluids between two adjacent plates, and each partitioned into a plurality of compartments separated from each other in a sealed manner. Each compartment is configured for the circulation of one fluid from the plurality of fluids, and is in fluid communication with one of the compartments of a distinct intermediate multi-fluid space.

The present disclosure provides a polyolefin film including a fibrous polyolefin having an average diameter of 0.1 μm or more and less than 1.0 μm, wherein the polyolefin film has a connected-void structure, has a void ratio a of 50% to 90%, has a thickness d in μm, which satisfies, together with the void ratio a, a relation of 40≤(d×(100−a)/100)≤200, and is used as a radiative cooling film, and a radiative cooling structure body including the polyolefin film.

The present disclosure provides a polyolefin film including a fibrous polyolefin having an average diameter of 0.1 μm or more and less than 1.0 μm, wherein the polyolefin film has a connected-void structure, has a void ratio a of 50% to 90%, has a thickness d in μm, which satisfies, together with the void ratio a, a relation of 40≤(d×(100−a)/100)≤200, and is used as a radiative cooling film, and a radiative cooling structure body including the polyolefin film.

To provide a heat-dissipating sheet having good close-contact properties with an adherend such as a heat-generating body and being easy to handle. A heat-dissipating sheet includes a heat-dissipating member including a graphite sheet, a first thermally conductive layer, and a second thermally conductive layer stacked in this order. The first thermally conductive layer contains a thermally conductive filler dispersed in a polymer matrix and has an outer shape larger than the graphite sheet when viewed in plan. The second thermally conductive layer contains a thermally conductive filler dispersed in a polymer matrix, is more flexible than the first thermally conductive layer, and has an outer shape identical to or smaller than the first thermally conductive layer when viewed in plan.

A heat exchange apparatus, and method of forming the apparatus, are disclosed. The apparatus includes a thermally conductive substrate with a metal microlattice structure adhered to the thermally conductive substrate and in thermal communication with the thermally conductive substrate, the metal microlattice structure comprising a region containing an electroless metal. A method of making the apparatus includes forming a polymer lattice, applying the polymer lattice to a thermally conductive substrate, forming an electroless plated metal layer on the polymer lattice, forming an electroplated metal layer on the electroless metal layer, and forming a metal microlattice of the electroless metal layer and the electroplated metal layer.

A metal-on-ceramic substrate comprises a ceramic layer, a first metal layer, and a bonding layer joining the ceramic layer to the first metal layer. The bonding layer includes thermoplastic polyimide adhesive that contains thermally conductive particles. This permits the substrate to withstand most common die attach operations, reduces residual stress in the substrate, and simplifies manufacturing processes.

Disclosed herein are systems and methods for passively cooling water vapor to enable efficient condensation, and methods of making such systems. A passive cooler can include a thermally conductive substrate having a first side and a second side opposite the first side, a coating disposed on at least a portion of the first side of the substrate, and a housing having one or more insulative walls. The insulative walls may define a vapor flow channel from an inlet to an outlet of the housing such that the second side of the substrate is exposed to water vapor flowing through the vapor flow channel.

In embodiments, a heat exchanger includes a tube configured to transfer a first fluid. The tube includes an outer surface configured to exchange heat with a second fluid as the second fluid flows over the outer surface of the tube. The tube also includes an inner surface defining an interior configured to contain and transfer the first fluid, and a plurality of surface features integrally formed as part of the inner surface. The surface features may extend radially inward toward the interior, and are configured to increase a surface area of the inner surface to improve heat exchange between the tube and the first fluid.

A fluid coil includes a tube bundle having a series of straight tubing runs and a series of return bends extending between and fluidically connecting ones of the straight tubing runs, an expansion header fluidically connected to at least some of the return bends and a polymeric material disposed in the expansion header. The polymeric material has an initial shape and is compressible to repeatedly expand and contract between a first volume in which water is present in the tube bundle and a second volume in which the water undergoes a phase change. Contraction of the polymeric material absorbs an increase in volume as the water undergoes the phase change to prevent stressing and rupture of the tube bundle and upon an opposite phase change, the polymeric material returns to its initial shape. The polymeric material can be a pressurizable bladder. A system and method to prevent the rupture of a tube bundle in a fluid coil are also disclosed.

The present disclosure relates to a heat exchanger including a plurality of fluid guiding metal pipes (2) having pipe ends (3) arranged side by side at intervals, at least one pipe bottom (4) made of plastic and having receiving through-holes (5) in which the pipe ends (3) may be received, and a collection box (6) made of plastic and which may be connected to the pipe bottom (4) by a locking device formed between the pipe bottom and the collection box, wherein a seal (9) may be inserted between the pipe bottom (4) and the collection box (6), and the seal ensures press-fit of the pipe bottom (4) on the pipe ends (3) and seals the collection box (6) against the pipe bottom (4) and the pipe bottom (4) against the pipe ends (3).