Abstract: A layer of a heat exchanger includes plurality of flow paths, a first end section comprising a plurality of flow path inlets and a plurality flow path outlets. a second end section comprising a turnaround section, a first morphing section fluidly connect to the first end section, a second morphing section fluidly connected to the second end section; and a central section positioned between and fluidly connected to the first and second morphing sections. The plurality of flow paths extend from the flow path inlets to the flow path outlets via the turnaround section in the second end section. In the first end section and the second end section the flow paths have a first cross section. The central section the flow paths have a second cross section and in the first and second morphing section the cross section of the flow paths morph between first and second cross sections.

Abstract: A fluid flow channel for a heat exchanger, the channel comprising an elongate tubular channel body extending along an axis A from a first end to a second end, the channel body having walls, the interior surface of which define an interior channel through which heat exchanger fluid flows from the first end to the second end, and wherein the channel body comprises two or more straight sections having a constant cross section in which the interior channel has a rectangular, square or triangular cross-section, and a twisted section between the or each pair of adjacent straight sections, in the axial direction, the twisted section being a section resulting from one of the straight sections twisted about the axis A with respect to an adjacent straight section.

Abstract: A heat exchanger extends between a first end and a second end and includes: a central core; and a heat exchange section; wherein the heat exchange section comprises: a primary flow inlet; a secondary flow inlet; a primary flow outlet; a secondary flow outlet; a plurality of primary flow tubes for conveying a primary flow from the primary flow inlet to the primary flow outlet; and a plurality of secondary flow tubes for conveying a secondary flow from the secondary flow inlet to the secondary flow outlet. The primary flow tubes and the secondary flow tubes are grouped together to form at least one strand; and wherein the at least one strand is helically wrapped around the central core.

Abstract: A heat exchanger for exchanging heat between first and second fluids, comprising first fluid channels extending in a longitudinal direction for carrying a first fluid, and second fluid channels extending in the longitudinal direction for carrying a second fluid, wherein the first and second fluid channels are arranged in an alternating pattern such that each of a plurality of the first channels is located laterally between second channels and each of a plurality of second channels is located laterally between first channels, and wherein the second fluid channels extend longitudinally beyond ends of the first fluid channels, and have ends that decrease in cross section such that the first fluid is able to pass around and between the ends of the second channels.

Abstract: A duct comprising: an inlet; an outlet; a shell having a tubular form extending between the inlet and the outlet; a main flow path (H) within the shell for conveying a main flow between the inlet and the outlet; and a heat exchange structure, wherein the heat exchange structure comprises: an intake port provided in the shell; an output port provided in the shell; and a secondary flow path (C) within the shell for conveying a secondary flow between the intake port and the output port, wherein the secondary flow path is spirally intertwined with the main flow path for a section of the duct to provide a heat exchanger within the duct.

Abstract: A method of forming fluid flow channels for a heat exchanger core includes additively manufacturing the channels such that each channel includes a straight axial fluid path portion (A) extending from one end of the channel to the other and that the cross-sectional shape of the channel varies along its length to form curved contact surfaces for the fluid as it flows along the channel, while keeping the cross-sectional area constant along each channel.

Abstract: A duct comprising: an inlet; an outlet; a shell having a tubular form extending between the inlet and the outlet; a main flow path (H) within the shell for conveying a main flow between the inlet and the outlet; and a heat exchange structure, wherein the heat exchange structure comprises: an intake port provided in the shell; an output port provided in the shell; and a secondary flow path (C) within the shell for conveying a secondary flow between the intake port and the output port, wherein the secondary flow path is spirally intertwined with the main flow path for a section of the duct to provide a heat exchanger within the duct.

Abstract: A multilayer heat exchanger device comprising: a stack of plates arranged to provide multiple fluid flow paths separated by the plates; wherein at least some of the plates are pin fin plates that each have an array of pins extending outwards from the pin fin plate into the fluid flow paths; and wherein each pin comprises an inner end integrally formed with the pin fin plate, a mid-point along a longitudinal axis of the pin, and an outer end to be bonded to an adjacent plate; wherein the cross sectional area of the pin at the outer end is larger than the cross sectional area at the mid-point.

Abstract: A secondary heat exchange surface channel portion for a heat exchanger 7 comprises multiple joints between adjacent channel portions 2a, 2b, 101, for redirecting flow of fluid along a tortuous path. One of the channel portions at each joint has a concave profiled edge face 120, thereby providing a gap 110 between adjacent channel portions. The primary use of this arrangement is in heat exchangers which have corrugated secondary heat exchange surfaces.

Abstract: A method for forming a heat exchanger includes forming a central channel and a core section. The central channel comprises forming a channel that runs along a longitudinal axis and forming a division in the central channel such that the central channel is divided into a first section and a second section, wherein the first section is in fluid communication with a first inlet of the central channel and the second section is in fluid communication with a second inlet of the central channel.

Abstract: A layer of a heat exchanger includes plurality of flow paths, a first end section comprising a plurality of flow path inlets and a plurality flow path outlets. a second end section comprising a turnaround section, a first morphing section fluidly connect to the first end section, a second morphing section fluidly connected to the second end section; and a central section positioned between and fluidly connected to the first and second morphing sections. The plurality of flow paths extend from the flow path inlets to the flow path outlets via the turnaround section in the second end section. In the first end section and the second end section the flow paths have a first cross section. The central section the flow paths have a second cross section and in the first and second morphing section the cross section of the flow paths morph between first and second cross sections.

Abstract: A heat exchanger extends between a first end and a second end and includes: a central core; and a heat exchange section; wherein the heat exchange section comprises: a primary flow inlet; a secondary flow inlet; a primary flow outlet; a secondary flow outlet; a plurality of primary flow tubes for conveying a primary flow from the primary flow inlet to the primary flow outlet; and a plurality of secondary flow tubes for conveying a secondary flow from the secondary flow inlet to the secondary flow outlet. The primary flow tubes and the secondary flow tubes are grouped together to form at least one strand; and wherein the at least one strand is helically wrapped around the central core.

Abstract: A heat exchanger for exchanging heat between first and second fluids, comprising first fluid channels extending in a longitudinal direction for carrying a first fluid, and second fluid channels extending in the longitudinal direction for carrying a second fluid, wherein the first and second fluid channels are arranged in an alternating pattern such that each of a plurality of the first channels is located laterally between second channels and each of a plurality of second channels is located laterally between first channels, and wherein the second fluid channels extend longitudinally beyond ends of the first fluid channels, and have ends that decrease in cross section such that the first fluid is able to pass around and between the ends of the second channels.

Abstract: A heat exchanger comprises a shell having a first inlet and a first outlet for a first fluid (H) and a second inlet and a second outlet for a second fluid (C), and a screw element. The screw element has a core and first and second nested helical flights mounted to the core. The helical flights define first and second helical fluid passages along the shell. The first fluid passage is in fluid communication with the first inlet and the first outlet and the second fluid passage is in fluid communication with the second inlet and the second outlet. The heat exchanger further comprises a plurality of tubes mounted between adjacent turns of the first and second helical flights and extending across the fluid flow passage formed between the helical flights for conducting the first and or second fluid.

Abstract: A duct comprising: an inlet; an outlet; a shell having a tubular form extending between the inlet and the outlet; a main flow path (H) within the shell for conveying a main flow between the inlet and the outlet; and a heat exchange structure, wherein the heat exchange structure comprises: an intake port provided in the shell; an output port provided in the shell; and a secondary flow path (C) within the shell for conveying a secondary flow between the intake port and the output port, wherein the secondary flow path is spirally intertwined with the main flow path for a section of the duct to provide a heat exchanger within the duct.

Abstract: A plate fin heat exchanger comprises a circular section tubular shell. The shell comprises a plurality of first shell openings arranged along a length of the shell and a plurality of second shell openings arranged along a length of the shell. A first fluid plenum is provided on the shell in fluid communication with the first shell openings. A second fluid plenum is provided on the shell in fluid communication with the second shell openings. The heat exchanger further comprises a core extending axially within the tubular shell. The core comprises an axially extending first core passage and a second axially extending core passage isolated from the first core passage.

Abstract: A multilayer heat exchanger device comprising: a stack of plates arranged to provide multiple fluid flow paths separated by the plates; wherein at least some of the plates are pin fin plates that each have an array of pins extending outwards from the pin fin plate into the fluid flow paths; and wherein each pin comprises an inner end integrally formed with the pin fin plate, a mid-point along a longitudinal axis of the pin, and an outer end to be bonded to an adjacent plate; wherein the cross sectional area of the pin at the outer end is larger than the cross sectional area at the mid-point.

Abstract: A secondary heat exchange surface channel portion for a heat exchanger 7 comprises multiple joints between adjacent channel portions 2a, 2b, 101, for redirecting flow of fluid along a tortuous path. One of the channel portions at each joint has a concave profiled edge face 120, thereby providing a gap 110 between adjacent channel portions. The primary use of this arrangement is in heat exchangers which have corrugated secondary heat exchange surfaces.

Abstract: A heat exchanger comprises a shell having a first inlet and a first outlet for a first fluid (H) and a second inlet and a second outlet for a second fluid (C), and a screw element. The screw element has a core and first and second nested helical flights mounted to the core. The helical flights define first and second helical fluid passages along the shell. The first fluid passage is in fluid communication with the first inlet and the first outlet and the second fluid passage is in fluid communication with the second inlet and the second outlet. The heat exchanger further comprises a plurality of tubes mounted between adjacent turns of the first and second helical flights and extending across the fluid flow passage formed between the helical flights for conducting the first and or second fluid.

Abstract: An actuator release mechanism comprising a longitudinal member, e.g. a piston, which is moveable axially to permit or prevent axial movement of the lock bolt and hence deployment of the actuator. Movement of the piston is due to the force of the lock bolt, under a spring force, on the one hand, and to the position and force of a linkage assembly on the other hand. The linkage assembly comprises a first link fixed, at one end, e.g. by means of a piston lock pin, to the piston and fixed at a pivot point to a second link. The second link is fixed to a rotational drive means, here a rotary solenoid or stepper motor, so as to rotate about a centre of rotation.