A refrigeration system in which a refrigerant is circulatable, the refrigeration system including an indoor coil assembly with an indoor coil and a suction header subassembly connected with indoor coil circuits of the indoor coil. The suction header subassembly includes a hollow suction header body defining a suction header bore therein and one or more extended spigots defining an extended spigot bore therein for directing the refrigerant into a selected one of the indoor coil circuits when operating in a defrost mode. The extended spigot includes an open inner end that is located in the suction header bore to receive a portion of the refrigerant flowing therethrough when the refrigeration system is operating in the defrost mode.

A liquid receiver is composed of a tubular base member having open upper and lower ends, a tubular tank member having a closed upper end and an open lower end and joined to the base member, and a plug fitted into the base member. A female screw is provided on the inner circumferential surface of the base member, and refrigerant inflow and outflow holes are formed in a portion of the base member above the female screw such that the former is located above the latter. A male screw to be screwed into the female screw is provided on the outer circumferential surface of the plug to be located below the refrigerant outflow hole. Sealing is established between a portion of the inner circumferential surface of the base member located below the female screw and a portion of the outer circumferential surface of the plug located below the male screw.

This application relates to a coolant condenser assembly for an air conditioning system for a motor vehicle. In a supercooling region, at least two cooling pipes, as the first supercooling parallel section, are acted upon in parallel by the coolant in a fluid-conducting manner, the coolant which flows out of the first supercooling parallel section flows into a first supercooling intermediate flow duct, and the first supercooling intermediate flow duct opens into at least two cooling pipes as the second supercooling parallel section, and the second supercooling parallel section opens into a second supercooling intermediate flow duct and the second supercooling intermediate flow duct opens into at least two cooling pipes as the third supercooling parallel section, such that the outlet opening is disposed on a second longitudinal side of the coolant condenser assembly.

A refrigerant distributor includes an inflow portion made of aluminum into which refrigerant flows through an inflow pipe, and a distributing portion made of aluminum that distributes incoming refrigerant to a plurality of outflow pipes. The distributing portion includes a main body portion connected to the inflow portion, and a plurality of outflow portions connected to the outflow pipes. The outflow portions are protruded from the main body portion, and are formed integrally with the main body portion.

A heat exchanger comprising: a mixing and redistribution header (20) at one end of the heat exchanger; multiple heat exchange tubes (30) in communication with the mixing and redistribution header (20). An upper cavity (21) and a lower cavity (22) in communication with each other are disposed in the mixing and redistribution header (20); a fluid entering the heat exchanger first of all flows into a part of the lower cavity (22) of the mixing and redistribution header (20), then is collected and mixed in the upper cavity (21) of the mixing and redistribution header (20), and is distributed into another part of the lower cavity (22) and flows out through a heat exchange tube (30) in communication with the lower cavity, a cross-sectional area of the upper cavity (21) being equal to or greater than a cross-sectional area of the lower cavity (22).

A heat exchanger includes a plurality of heat exchange tubes and corrugated fins. The heat exchange tubes are spaced apart from one another in a vertical direction of the heat exchanger. The corrugated fins are each disposed between adjacent heat exchange tubes. Each of the corrugated fins includes crest portions, trough portions, and connection portions. The crest portions extend in an air passage direction of the heat exchanger. The trough portions extend in the air passage direction. The connection portions connect the crest portions and the trough portions. The number of the crest portions of each of the corrugated fins disposed between adjacent heat exchange tubes falls within a range of a designed number 2. The designed number is a standard number.