Abstract: A laminated header for a microchannel heat exchanger comprises a distribution plate comprising a first cut-out section of a first shape extending along a longitudinal axis of the distribution plate, wherein a width of the first cut-out section at least partially decreases along the longitudinal axis a hole plate comprising a plurality of bore-holes formed therein and separated by a distance therebetween, a section plate comprising a plurality of second cut-out sections of a second shape different from the first shape, and wherein the hole plate is parallelly stacked between the distribution plate and the section plate. The first cut-out section fluidically connects with each of the bore-holes and the second cut-out sections fluidically connects the bore-holes to a plurality of microchannel tubes of the heat exchanger.

Abstract: Described herein is a fluid distributor for a header associated with a heat exchanger. The distributor comprises a distributor tube comprising a first tube segment, and a second tube segment extending at a predefined angle from an end of the first tube segment, wherein the distributor tube comprises a hole at a predefined position on a predefined side, facing towards the first tube segment on an inner side of a bend, of the second tube segment, wherein the distributor tube is configured with the header such that the first tube segment remains outside of the header and the second tube segment extends longitudinally within the header via a first end of the header, with the hole located at the first end of the header.

Abstract: A heat transfer tube and a heat exchanger incorporating at least one heat transfer tube are provided. The heat transfer tube and the heat exchanger are optimized for use within an air conditioner (which is configured to operate only in a cooling mode). The heat transfer tube includes a tube body with an interior surface and an exterior surface. The tube body defining an outer diameter (Do) and a wall thickness (WT), wherein a ratio (WT/Do) the wall thickness (WT) to the outer diameter (Do) is between 0.061 and 0.071. The heat transfer tube includes multiple pluralities of adjacent helical fins protruding circumferentially around the interior surface of the tube body at respective helix angles. The multiple pluralities are separated by one or more transition area(s).

Abstract: A heat transfer tube and a heat exchanger incorporating at least one heat transfer tubes are provided. The heat transfer tube and the heat exchanger are configured to operate in both a heating mode and a cooling mode (e.g., to optimize the reversible function a heat pump). The heat transfer tube includes a tube body with an interior surface and an exterior surface. The tube body defining an outer diameter (Do) and a wall thickness (WT), wherein a ratio (WT/Do) the wall thickness (WT) to the outer diameter (Do) is between 0.061 and 0.071. The heat transfer tube includes a plurality of adjacent helical fins protruding circumferentially around the interior surface of the tube body, and at least one groove disposed between the plurality of adjacent helical fins. The configuration of the heat transfer tube(s) is optimal for the reversible function of the heat pump.