Abstract: Disclosed is a shell-and-tube heat exchanger assembly, having: a first tubesheet configured for being secured to a shell of the shell-and-tube heat exchanger assembly, the first tubesheet including: a first section and a second section; the second section configured to be secured to a first shell end of the shell; and the first section including a plurality of holes configured to support a respective plurality of aluminum tubes extending through the shell, wherein the first section is configured to limit a galvanic response of the plurality of aluminum tubes when exposed to a chiller water.

Abstract: Disclosed is a tube bending system for forming a hairpin tube, the tube bending system including: a supply of lubricant; a supply of atomizing medium; a bend mandrel, the bend mandrel comprising: a mandrel body and a mandrel head, the mandrel head being positionable within a length of a tube to be bent, the mandrel head including a downstream end with an orifice configured for injecting lubricant into the tube.

Abstract: Disclosed is a shell-and-tube heat exchanger assembly, having: a first tubesheet configured for being secured to a shell of the shell-and-tube heat exchanger assembly, the first tubesheet including: a first section and a second section; the second section configured to be secured to a first shell end of the shell; and the first section including a plurality of holes configured to support a respective plurality of aluminum tubes extending through the shell, wherein the first section is configured to limit a galvanic response of the plurality of aluminum tubes when exposed to a chiller water.

Abstract: A heat exchanger is disclosed. The heat exchanger includes a hollow tube including a first aluminum alloy extending along an axis from a tube inlet to tube outlet. A first plurality of fins including a second aluminum alloy extends outwardly from an outer surface of the tube. A second plurality of fins including a third aluminum alloy extends outwardly from the outer surface of the tube, interspersed along the axis with the fins including the second aluminum alloy. The third aluminum alloy is less noble than each of the first aluminum alloy and the second aluminum alloy, and includes an alloying element selected from tin, indium, gallium, or combinations thereof. A first fluid flow path is disposed through hollow tube from the tube inlet to the tube outlet. A second fluid flow path is disposed across an outer surface of the hollow tube through spaces between adjacent fins.

Abstract: A heat exchanger is disclosed. The heat exchanger includes a hollow tube including a first aluminum alloy extending along an axis from a tube inlet to tube outlet. A first plurality of fins including a second aluminum alloy extends outwardly from an outer surface of the tube. A second plurality of fins including a third aluminum alloy extends outwardly from the outer surface of the tube, interspersed along the axis with the fins including the second aluminum alloy. The third aluminum alloy is less noble than each of the first aluminum alloy and the second aluminum alloy, and includes an alloying element selected from tin, indium, gallium, or combinations thereof. A first fluid flow path is disposed through hollow tube from the tube inlet to the tube outlet. A second fluid flow path is disposed across an outer surface of the hollow tube through spaces between adjacent fins.

Abstract: A heat exchanger is disclosed. The heat exchanger includes a hollow tube extending from a tube inlet to a tube outlet. The hollow tube includes a wall that includes a core of a first aluminum alloy, and a cladding over the core of a second aluminum alloy. The second aluminum alloy is less noble than the first aluminum alloy and includes an alloying element selected from tin, indium, or gallium, or combinations thereof. A first fluid flow path is disposed along an inner surface of the wall from the tube inlet to the tube outlet, and a second fluid flow path is disposed across an outer surface of the wall.

Abstract: A heat exchanger is disclosed. The heat exchanger includes a hollow tube extending from a tube inlet to a tube outlet. The hollow tube includes a wall inner surface comprising a copper alloy or a first aluminum alloy. A first fluid flow path is disposed along the wall inner surface from the tube inlet to the tube outlet. A turbulator is disposed within the hollow tube along the first fluid flow path, and the turbulator comprises a second aluminum alloy that is less noble than the copper or first aluminum alloy. A second fluid flow path is disposed across an outer surface of the wall.

Abstract: Disclosed is a tube bending system for forming a hairpin tube, the tube bending system including: a supply of lubricant; a supply of atomizing medium; a bend mandrel, the bend mandrel comprising: a mandrel body and a mandrel head, the mandrel head being positionable within a length of a tube to be bent, the mandrel head including a downstream end with an orifice configured for injecting lubricant into the tube.

Abstract: A heat exchanger is provided including a first manifold and a second manifold separated from the first manifold. A plurality of heat exchange tube segments are arranged in spaced parallel relationship and fluidly couple the first and second manifold. Each of the plurality of tube segments includes a first heat exchange tube and a second heat exchange tube at least partially connected by a web extending there between. The plurality of heat exchange tube segments includes a bend defining a first section and a second section of the heat exchange tube segments. The first section is arranged at an angle to the second section. A plurality of first fins extends form the first section of the heat exchange tube segments and a plurality of second fins extends from the second section of the heat exchange tube segments.

Abstract: A system for joining articles includes a joining unit; a positioning unit coupled to the joining unit, the positioning unit positioning the joining unit; a vision system obtaining an image of an item to be joined on a workpiece; a controller for processing the image and controlling a position of the joining unit relative to the item to be joined in response to the image; and a temperature probe for monitoring a temperature; wherein the controller adjusts the position of the joining unit in response to the temperature.

Abstract: A heat exchanger is provided including a first manifold and a second manifold separated from the first manifold. A plurality of heat exchange tube segments are arranged in spaced parallel relationship and fluidly couple the first and second manifold. Each of the plurality of tube segments includes a first heat exchange tube and a second heat exchange tube at least partially connected by a web extending there between. The plurality of heat exchange tube segments includes a bend defining a first section and a second section of the heat exchange tube segments. The first section is arranged at an angle to the second section. A plurality of first fins extends form the first section of the heat exchange tube segments and a plurality of second fins extends from the second section of the heat exchange tube segments.

Abstract: A method of lubricating an interior of a tube includes applying a lubricant including a mixture of an additive and a solvent into an interior of a tube. A flow of drying agent is injected into a first end of the tube to force the solvent from the interior of the tube via a second end of the tube thereby leaving a coating of additive at the interior of the tube. The drying agent is heated to remove additional solvent from the interior of the tube via evaporation.

Abstract: A heat exchanger includes a plurality of fins and a plurality of tubes passing a fluid therethrough, extending through the plurality of fins and radially expanded into an interference fit therewith. At least one tube of the plurality of tubes includes an outer diameter, an inner diameter, and a plurality of ridges extending from the inner diameter inwardly into an interior of the tube. A tube internal surface area per unit of length of the tube multiplied by the ratio of the outer diameter and tube wall thickness is equal to or greater than about 30.0.

Abstract: A brazing ring is provided and includes ring material including an aluminum-zinc-silicon alloy having a first melting point and flux material contained within the ring material having a second melting point, which is substantially lower than the first melting point, the ring material being formed such that the flux material is exposed outwardly to a heat source and such that, upon heating, flux material melts before the ring material.

Abstract: An automated brazing system by which an apparatus is conveyed along a path defined through a brazing zone is provided and includes first and second sets of burners disposed within the brazing zone at first and second opposing sides of the path, respectively, to heat the components of the apparatus substantially uniformly at the first and second sides and to heat the components of the apparatus substantially uniformly along the brazing zone, such that each side of each of the components is heated to a substantially similar temperature as each side of each of the other components.

Abstract: An automated brazing system by which an apparatus is conveyed along a path defined through a brazing zone is provided and includes first and second sets of burners disposed within the brazing zone at first and second opposing sides of the path, respectively, to heat the components of the apparatus substantially uniformly at the first and second sides and to heat the components of the apparatus substantially uniformly along the brazing zone, such that each side of each of the components is heated to a substantially similar temperature as each side of each of the other components.

Abstract: A system for joining articles includes a joining unit; a positioning unit coupled to the joining unit, the positioning unit positioning the joining unit; a vision system obtaining an image of an item to be joined on a workpiece; a controller for processing the image and controlling a position of the joining unit relative to the item to be joined in response to the image; and a temperature probe for monitoring a temperature; wherein the controller adjusts the position of the joining unit in response to the temperature.

Abstract: A brazing ring is provided and includes ring material including an aluminum-zinc-silicon alloy having a first melting point and flux material contained within the ring material having a second melting point, which is substantially lower than the first melting point, the ring material being formed such that the flux material is exposed outwardly to a heat source and such that, upon heating, flux material melts before the ring material.

Abstract: A method of lubricating an interior of a tube includes applying a lubricant including a mixture of an additive and a solvent into an interior of a tube. A flow of drying agent is injected into a first end of the tube to force the solvent from the interior of the tube via a second end of the tube thereby leaving a coating of additive at the interior of the tube. The drying agent is heated to remove additional solvent from the interior of the tube via evaporation.

Abstract: An expansion bullet for a heat exchanger tube includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius. An expansion mechanism for a tube of heat exchanger includes a bullet driving device and an expansion bullet drivable by the bullet driving device. The expansion bullet includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.