The disclosure relates to a heat transfer assembly for a rotary regenerative heat exchanger. The assembly includes a rotor arranged between at least two separated fluid flow passages passing flow axially through the rotor, where each flow passage is connected to a sector part of the rotor. The assembly further includes a plurality of channels in the rotor for flowing a fluid through the rotor, each of the channels is enclosed by heat transfer and heat accumulating surfaces in the rotor, and the heat transfer and heat accumulating surfaces of the channels are made in a material providing an average axial thermal conductivity less than 100 W/mK arranged to reduce the Longitudinal Heat Conductivity of the rotor.

A retrofittable towel warmer for use with a hot tub preferably comprises a flexible conduit portion which is attachable to one of the jets of the hot tub together with a rigid thermally conductive portion which is detachably mountable on an exterior mast support. There is also preferably provided an exterior housing surrounding the thermally conductive portion designed to provide maximum thermal contact with the cloth material to be heated. The entire unit may be immersed in the hot tub or pool water when not in use. In an alternate embodiment a container having a thermally absorptive medium is provided in a structure which is easily mounted on the mast. In an alternate embodiment a container having a thermally absorptive medium is provided in a structure which is easily mounted on a supporting mast.

A tube bundle assembly includes at least one tube and a baffle. The baffle includes at least one hole for receiving the at least one tube. The at least one hole has a non-uniform diameter such that only a portion of a periphery of the at least one hole is positionable in contact with the at least one tube.

A method of making a heat exchanger with a net shape moldable highly thermally conductive polymer composite includes mixing a polymer and a thermally conductive filler material and molding the polymer composite into heat exchanger components. The heat exchanger can be tailored to varying heating and cooling needs with moldable geometries.

A method of making a heat exchanger with a net shape moldable highly thermally conductive polymer composite includes mixing a polymer and a thermally conductive filler material and molding the polymer composite into heat exchanger components. The heat exchanger can be tailored to varying heating and cooling needs with moldable geometries.

The disclosure relates to a heat transfer assembly for a rotary regenerative heat exchanger. The assembly includes a rotor arranged between at least two separated fluid flow passages passing flow axially through the rotor, where each flow passage is connected to a sector part of the rotor. The assembly further includes a plurality of channels in the rotor for flowing a fluid through the rotor, each of the channels is enclosed by heat transfer and heat accumulating surfaces in the rotor, and the heat transfer and heat accumulating surfaces of the channels are made in a material providing an average axial thermal conductivity less than 100 W/mK arranged to reduce the Longitudinal Heat Conductivity of the rotor.

A method of making a heat exchanger with a net shape moldable highly thermally conductive polymer composite includes mixing a polymer and a thermally conductive filler material and molding the polymer composite into heat exchanger components. The heat exchanger can be tailored to varying heating and cooling needs with moldable geometries.

A method of installing a drain water heat recovery exchanger for pre-heating water to be heated using a solar, electric or combustion energy hot water heater or to be sent to the cold-water line of a hot-water-consuming apparatus. It includes providing a drain water heat recovery exchanger including a copper pipe inlet fitting and a copper pipe outlet fitting and a core waste water drain tube, the fittings being fashioned to include barbs for a male plastic pipe connection; inserting the drain water heat recovery exchanger into a drain water pipe, wherein the core waste water drain tube is connected to the drain water pipe; and connecting a first one of the fittings to a cold-water supply and a second one of the fittings to an inlet of a hot water heater, a hot water tank or a cold-water line of a hot-water-consuming apparatus.

A method of making a heat exchanger with a net shape moldable highly thermally conductive polymer composite includes mixing a polymer and a thermally conductive filler material and molding the polymer composite into heat exchanger components. The heat exchanger can be tailored to varying heating and cooling needs with moldable geometries.

A method of making a heat exchanger uses a functionally graded polymer composite material to create the heat exchanger. The polymer composite material includes a polymer and a filler, the filler concentration is varied in each part of the heat exchanger, either within the part, creating a gradient, or is different in each part of the heat exchanger depending on use of that part of the heat exchanger.