A multi-step method is disclosed for exchanging heat in a vapor compression heat transfer system having a working fluid circulating therethrough. The method includes the step of circulating a working fluid comprising a fluoroolefin to an inlet of a first tube of an internal heat exchanger, through the internal heat exchanger and to an outlet thereof. Also disclosed are vapor compression heat transfer systems for exchanging heat. The systems include an evaporator, a compressor, a dual-row condenser and an intermediate heat exchanger having a first tube and a second tube. A disclosed system involves a dual-row condenser connected to the first and second intermediate heat exchanger tubes. Another disclosed system involves a dual-row evaporator connected to the first and second intermediate heat exchanger tubes.

A heat exchange conduit includes a body having a first portion including a first flow channel and a second portion including a second flow channel. A cross-section of the heat exchange conduit varies over a length of the heat exchange conduit.

Techniques for structurally integrated heat exchangers are presented herein. A heat exchanger in accordance with an aspect of the present disclosure comprises a structure configured to enclose a volume for storing a first fluid, and to connect to a load. The heat exchanger further comprises a first and a second header first arranged in opposing inner walls of the structure. The heat exchanger further comprises one or more load-bearing struts extending to connect the first and second headers within the volume and configured to pass a second fluid through the volume for transferring heat to the first fluid, the second fluid configured to cool a different component in the vehicle.

A heat exchanger includes: flat pipes disposed in multiple stages in a stage direction corresponding to an up-down direction; and fins that partition a space between adjacent two of the flat pipes into air flow passages through which air flows. Each of the flat pipes includes a passage for a refrigerant inside thereof. The flat pipes are divided into heat exchange paths arrayed in multiple stages in the stage direction. One of the heat exchange paths that includes a lowermost one of the flat pipes is defined as a first heat exchange path. A length of the passage from a first end to a second end of a flow of the refrigerant in each of the heat exchange paths is defined as a path effective length.

A microtube heat exchanger is disclosed, including two end plates with an array of holes or openings and an array of microtubes disposed in the array of openings between the two end plates. The heat exchanger can be used in environmental control systems, including systems for aerospace applications.

A finned tube heat exchanger includes a plurality of tube arrays, each of which includes a plurality of heat transfer tubes that each extend parallel to one another and are disposed at a predetermined pitch in a first direction that intersects a flow direction of heat exchanging air, in a second direction that intersects the first direction, any closest two of the plurality of tube arrays having a predetermined distance therebetween. One closest two tube arrays includes first and second tube arrays that respectively include a plurality of first heat transfer tubes and a plurality of second heat transfer tubes. When seen from the flow direction, each first heat transfer tube is disposed closer to one of an adjacent two second heat transfer tubes that is closest to said each first heat transfer tube, than to the other one of the adjacent two second heat transfer tubes.

A microtube heat exchanger is disclosed, including two end plates with an array of holes or openings and an array of microtubes disposed in the array of openings between the two end plates. The heat exchanger can be used in environmental control systems, including systems for aerospace applications.

A method of making a heat exchanger that includes sealing tubes to header slots and brazing the tubes to the header slots. The method further includes coupling a cover to the header to cover a liquid-side surface of the header and to cover ends of the tubes, and applying flux to an air-side surface of the header and to the tubes. Coupling the cover to the header is performed after sealing the tubes to the header slots and coupling the cover to the header is performed before applying flux to the air-side surface of the header and to the tubes. Applying flux is performed before brazing each of the tubes to the header slots and sealing each of the tubes to the header slot includes sealing a perimeter of each of the tubes to the header slot.

The present disclosure discloses a heat exchanger including a group of collecting pipes and a number of heat exchange assemblies. Each heat exchange assembly includes a fin plate and at least one heat exchange tube. The heat exchange assembly includes a main heat exchange area. The heat exchange tube is connected with the fin plate. The heat exchange tube at least partially protrudes from at least one side of the fin plate. In addition, in the main heat exchange area corresponding to two adjacent heat exchange assemblies, at least two adjacent heat exchange tubes are staggered along an array direction of the heat exchange assemblies. The two heat exchange tubes respectively belong to the two adjacent heat exchange assemblies. The present disclosure is beneficial to improve the performance of the heat exchanger.

A multi-step method is disclosed for exchanging heat in a vapor compression heat transfer system having a working fluid circulating therethrough. The method includes the step of circulating a working fluid comprising a fluoroolefin to an inlet of a first tube of an internal heat exchanger, through the internal heat exchanger and to an outlet thereof. Also disclosed are vapor compression heat transfer systems for exchanging heat. The systems include an evaporator, a compressor, a dual-row condenser and an intermediate heat exchanger having a first tube and a second tube. A disclosed system involves a dual-row condenser connected to the first and second intermediate heat exchanger tubes. Another disclosed system involves a dual-row evaporator connected to the first and second intermediate heat exchanger tubes.