A device for heat recovery from service water, including at least one, in particular integrally materially bonded, heat-exchanger tube and a body having a substantially surface-like/laminar, in particular plate-like, region, wherein the at least one heat-exchanger tube, in particular made of copper or stainless steel, is oriented along a plane that is not orthogonal to, in particular is parallel to, the main plane of extension of the region.

The invention relates to a fuel cell system (10) comprising at least one fuel cell stack (11) having an anode section (12) and a cathode section (13), an ejector (14), a fuel mixture line (15) for conveying a fuel mixture—containing primary fuel and secondary fuel—from the ejector (14) to the anode section (12), a primary fuel line (16) for supplying the primary fuel to the ejector (14), and a recirculation line (17) for returning the secondary fuel from the anode section (16) to the ejector (14), wherein at least sections of the primary fuel line (16) extend through a heat exchange volume (18) within the recirculation line (17) for a heat-transmitting connection between the secondary fuel and the primary fuel.

A heat exchange device may include a first pipe including a first inlet, a first outlet, and a first sidewall extending therebetween; a second pipe including a second inlet, a second outlet, and a second sidewall extending therebetween; and a plurality of dimples extending between the first sidewall and the second sidewall. The second sidewall may surround and extend about the first sidewall, the first sidewall may define a first fluid passage configured to permit flow of a first fluid, and the second sidewall and the first sidewall may define a second fluid passage configured to permit flow of a second fluid.

A heat exchanger assembly including at least one coil shaped heat exchanger pipe assembly for passing through a fluid to be heated. The heat exchanger pipe assembly has an inlet and an outlet and includes coil windings extending concentrically around a coil axis. The heat exchanger assembly further includes a housing in which the heat exchanger pipe assembly is received, such that a flue gas transport gap extends between the heat exchanger pipe assembly and the circumferential wall. In use, hot flue gas passes the coil windings, thereby imparting the heat to the fluid present in the heat exchanger pipe assembly. The housing has a first and a second end wall which close off a first end and a second end of the circumferential wall. The second end wall includes a burner cover opening in which a burner cover can be mounted. The housing is made of plastic and the heat exchanger pipe assembly is clamped in axial direction between the first and the second end wall of the plastic housing.

A double pipe type heat exchanger includes an inner pipe having a first flow path defined therein and an outer pipe arranged around the inner pipe to define a second flow path between the inner pipe and the outer pipe. The inner pipe includes a spiral groove formed on an outer circumferential surface of the inner pipe to extend along a longitudinal direction of the inner pipe. The outer pipe includes a reduced diameter portion protruding inwardly so that the inner surface of the outer pipe is intermittently contacted with the outer circumferential surface of the inner pipe.

A double pipe type heat exchanger includes an inner pipe having a first flow path defined therein and an outer pipe arranged around the inner pipe to define a second flow path between the inner pipe and the outer pipe. The inner pipe includes a spiral groove formed on an outer circumferential surface of the inner pipe to extend along a longitudinal direction of the inner pipe. The outer pipe includes a reduced diameter portion protruding inwardly so that the inner surface of the outer pipe is intermittently contacted with the outer circumferential surface of the inner pipe.

A refrigeration, or thermal, energy storage system for storing refrigeration, or thermal, energy, comprising a body, closed and insulated, the body being configured to contain two fluids, respectively a Phase Change Material (PCM) type fluid and a secondary fluid, the two fluids being immiscible with each other and having different densities, so as to be stratified within the volume of the body; withdrawal means configured to draw the secondary fluid from the body, and to convey the same inside a heat exchanger configured to exchange frigories, or calories, with the secondary fluid; and distribution means configured to draw the secondary fluid from the heat exchanger, and distribute the secondary fluid into the PCM type fluid, so that the secondary fluid exchanges with the PCM type fluid frigories, or calories, absorbed in the heat exchanger, the secondary fluid having a solidification temperature substantially lower than that of the PCM type fluid.

A heat exchanger system includes a core structure with an oil flow path configured to receive an oil flow. The heat exchanger system also includes a fuel flow path included in the core structure and configured to receive a fuel flow. The fuel flow path is coupled to the oil flow path to allow the fuel flow to receive heat from the oil flow in the oil flow path. Also, the heat exchanger system includes a supplemental airflow path defined at least partly by the core structure and configured to receive a supplemental airflow that receives heat from at least one of the oil flow and the fuel flow.

An insulated heat exchanger tube assembly is disclosed herein comprising a heat exchanger tube, an insulating portion form-fitted around the heat exchanger tube, the insulating portion comprising a polymeric foam, and a polymeric film formed over and adhered to the insulating portion. A heat exchanger formed from the tube and a method of forming an insulated heat exchanger tube also are disclosed. The tube assembly is useful in making a heat exchanger that requires minimal floor space and can be efficiently assembled.

An insulated heat exchanger tube assembly is disclosed herein comprising a heat exchanger tube, an insulating portion form-fitted around the heat exchanger tube, the insulating portion comprising a polymeric foam, and a polymeric film formed over and adhered to the insulating portion. A heat exchanger formed from the tube and a method of forming an insulated heat exchanger tube also are disclosed. The tube assembly is useful in making a heat exchanger that requires minimal floor space and can be efficiently assembled.