A heat exchanger has: a first manifold assembly having a stack of plates; a second manifold assembly having a stack of plates; and a plurality of tubes extending from the first manifold assembly to the second manifold assembly. The plurality of tubes is a plurality groups of tubes. For each of the groups of the tubes: the tubes of the group have first ends mounted between plates of the first manifold assembly; and the tubes of the group have second ends mounted between plates of the second manifold assembly.

There is provided a cobalt-based alloy product comprising: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; at least one of Ti, Zr, Hf, V, Nb and Ta, the total amount of Ti, Zr, Hf, V, Nb and Ta being 0.5-2%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The cobalt-based alloy product is a polycrystalline body of matrix phase crystal grains, wherein MC type carbide phase grains are dispersively precipitated in the matrix phase crystal grains at an average intergrain distance of 0.13 to 2 μm and M.sub.23C.sub.6 type carbide phase grains are precipitated on grain boundaries of the matrix phase crystal grains.

A heat transfer element is disclosed. The heat transfer element can be configured to directly bond to a metal surface of an element. The heat transfer element can include a chamber that is defined at least in part by a housing that has a metal portion. The heat transfer element can also include a phase change material disposed in the chamber. The phase change material can be in thermal communication with the metal portion. The Heat transfer element can be bonded to the element to define a bonded structure.

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 Ni—Ti-based alloy contains a Ni atom, a Ti atom, and a Si atom. The Ni—Ti-based alloy has a heat-absorbing/generating property.

A heat exchanger includes a plurality of first and second fluid passages. The first fluid passages are defined by a pair of opposing first fluid passage walls and a plurality of first fluid diverters disposed between the first fluid passages walls. The second fluid passages are defined by a pair of opposing second fluid passage walls and a plurality of second fluid diverters disposed between the second fluid passage walls. The second fluid diverters include a body portion and a leading edge portion. The first fluid passage walls form a first fluid leading edge that extends upstream of the leading edge portion of the second fluid diverters. The second fluid passages extend in a direction perpendicular to the direction of the first fluid passages.

A method to reduce corrosion rates of materials at high temperatures may include heating a mixture and applying the heated mixture to a material to be rendered thermodynamically noble. The mixture may include carbon monoxide and carbon dioxide and the material rendered thermodynamically noble may include copper or other material having similar physical properties. The copper or other similar material may be applied to a structural material and provide a surface interfacing with the mixture of carbon monoxide and carbon dioxide to prevent corrosion of the structural material. In some cases, the structural material may form a heat exchanger defining passageways for a working fluid of a power system and/or may form other passageways of the power system. The copper may be applied to the passageways as a protective coating and then made thermodynamically noble at high temperatures after interactions with the mixture of carbon monoxide and carbon dioxide.

A method includes forming an electronics housing defining a first flow path spaced apart from the second flow path for heat exchange through the housing between the first and second flow paths. The electronics housing is of a first material. The method includes depositing a heat exchange fin on the electronics housing. The heat exchange fin is of a second material different from the first material, wherein the heat exchange fin is grown into the second flow path to facilitate heat exchange between the first flow path and the second flow path.

A heat exchanger has: an inlet manifold having an inlet port; and an outlet manifold having an outlet port. A first gas flowpath passes from the inlet port to the outlet port. A plurality of plate banks are positioned end-to-end, each plate bank having a plurality of conduits with interiors along respective branches of the first gas flowpath, a second gas flowpath extending across exteriors of the plurality of conduits. One or more docks couple adjacent ends of the plurality of plate banks.

A cooling device including an encapsulated phase change porous layer that exhibits an increased heat capacity is disclosed. The encapsulated phase change porous layer may include a sintered porous layer, a phase change material formed over the sintered porous layer, and an encapsulation material formed over the phase change material. The encapsulation material may encapsulate the phase change material between the encapsulation material and the sintered porous layer and retain the phase change material between the encapsulation material and the sintered porous layer when a fluid is flowed through or in contact with the encapsulated phase change porous layer.