A heat exchanger to exchange heat from a first fluid to a second fluid includes a center manifold to receive the first fluid, a first inner loop having an inner loop inlet and an inner loop outlet, and a first outer loop disposed around the first inner loop, the first outer loop having an outer loop inlet and an outer loop outlet, wherein the inner loop inlet and the outer loop inlet are adjacent, and the inner loop outlet and the outer loop outlet are adjacent.

An electronics cooling system for an aircraft includes a heat exchanger comprising a coolant circuit, an air circuit, and a fuel circuit such that each of the circuits is in thermal communication with at least one of the other circuits. The coolant circuit is in thermal communication with one or more aircraft electronics. The air circuit is in fluid communication with at least one air source. The fuel circuit is in fluid communication with a fuel tank between the fuel tank and an engine of the aircraft.

A heat transfer element includes curved mounting surfaces configured to mate with an outer surface of a pipe for attachment thereto; and a channel configured to receive a tracer therein. The heat transfer element is configured to effect conductive heat transfer from the tracer to the pipe, or to process flowing through the pipe, when attached with heat transfer cement (HTC) to both the pipe and the tracer. A system includes a pipe and a tracer; HTC; and a heat transfer element having curved mounting surfaces configured to mate with an outer surface of the pipe and attached thereto via the HTC, and a channel in which the tracer is received and secured via HTC. The heat transfer element is configured to effect conductive heat transfer from the tracer to the pipe, or to process flowing through the pipe, when attached with HTC to both the pipe and the tracer.

A reforming furnace for producing hydrogen is provided. The reforming furnace includes a plurality of reforming tubes that allow a flow of hydrocarbons and at least one fluid inside the tubes, from top to bottom, and have, on at least part of the upper half of the outer surface at least one fin that has a thickness of between 1 and 30 mm, a width of between 3 and 100 mm, and a length of between 1 m and an length equivalent to the height of the furnace.

A reforming furnace for producing hydrogen is provided. The reforming furnace includes a plurality of reforming tubes that allow a flow of hydrocarbons and at least one fluid inside the tubes, from top to bottom, and have, on at least part of the upper half of the outer surface at least one fin that has a thickness of between 1 and 30 mm, a width of between 3 and 100 mm, and a length of between 1 m and an length equivalent to the height of the furnace.

A device heating a fluid and usable in a rocket launcher to pressurize a liquefied propellant. The device includes a first burner performing first combustion between a limiting propellant and an excess propellant; a first heat exchanger in which first burnt gas from the first combustion transfers heat to the fluid; at least one second burner into which both the first burnt gas and some limiting propellant are injected to perform second combustion between the limiting propellant and at least a portion of unburnt excess propellant present in the first burnt gas. The second burnt gas from the second combustion flows through a second heat exchanger to transfer heat to the fluid. Burnt gas from each combustion flows in respective burnt gas tubes within a common overall heat exchanger including the heat exchange units, the gas transferring heat to the fluid, the fluid flowing between the burnt gas tubes.

A device heating a fluid and usable in a rocket launcher to pressurize a liquefied propellant. The device includes a first burner performing first combustion between a limiting propellant and an excess propellant; a first heat exchanger in which first burnt gas from the first combustion transfers heat to the fluid; at least one second burner into which both the first burnt gas and some limiting propellant are injected to perform second combustion between the limiting propellant and at least a portion of unburnt excess propellant present in the first burnt gas. The second burnt gas from the second combustion flows through a second heat exchanger to transfer heat to the fluid. Burnt gas from each combustion flows in respective burnt gas tubes within a common overall heat exchanger including the heat exchange units, the gas transferring heat to the fluid, the fluid flowing between the burnt gas tubes.

A heat exchanger, for example an intercooler or a coolant radiator, may include at least two floors each having a passage for accommodating a longitudinal end region of a plurality of fluid-conducting tubes. The heat exchanger may further include at least one side part having a longitudinal end region at least one of at least partially accommodated in a passage at an end of an associated floor and adjoining the associate floor. The at least one side part may include at least two segments having a different cross-section from one another.

A heat exchanger, for example a charge-air cooler, may include at least two bases respectively having a passage for receiving a plurality of fluid-conducting tubes on a longitudinal end side. The heat exchanger may include at least one collecting chamber arranged on at least one of the at least two bases, and at least one lateral part received via a longitudinal end area at least partially in an end-side passage of an associated base of the at least two bases. The longitudinal end area of the at least one lateral part may have a beam shape and at least one recess. The longitudinal end area of the at least one lateral part may further have a cross-sectional surface that is smaller than a cross-sectional surface of the end-side passage of the associated base.

The present invention relates to an apparatus comprising at least one multi-lumen tube, wherein the tube has a first group of lumens and a second group of lumens wherein the lumens of the second group are arranged around the lumen(s) of the first group, and wherein the lumen(s) of the first group serve the transportation of at least one first fluid, and wherein the lumens of the second group are filled with at least one functional fluid, wherein the apparatus furthermore comprises at least one actuator which is in communication with at least one of the second lumens and is configured such that at least one property of the functional fluid can be changed by means of the actuator.