An evaporator with a finned tube block with tubes and fins, wherein the tubes are arranged in rows and the fins are arranged between the tubes, with a first collection and distribution box and with a second collection and distribution box. Each of the two collection and distribution boxes has a bottom and a box lid. The respective bottom has openings for inserting the tube ends of the tubes of the finned tube block. The finned tube block is divided into evaporator flows to which groups of tubes of the finned tube block are assigned. The tubes of an evaporator flow each merge end-side into a box area of a collection and distribution box. The respective bottom of the collection and distribution boxes is designed with rim holes for inserting the tube ends in the openings.

Embodiments of the present invention disclose a heat exchanger and an air-conditioning system. The heat exchanger comprises heat exchange tubes. The heat exchange tubes comprise first heat exchange tubes configured to form a first circuit, and second heat exchange tubes configured to form a second circuit. With the heat exchanger and the air-conditioning system according to the embodiments of the present invention, for example, a heat exchange capacity of the heat exchanger in a part load condition is improved.

The air-conditioning apparatus includes a heat exchanger including a plurality of heat transfer tubes and a header manifold an axial fan and a refrigerant circuit. When the distance from the center of the flow space in the horizontal plane is represented on a scale of 0 to 100%, where 0% represents the center of the flow space and 100% is the position of the wall surface of the header manifold, among the plurality of branch tubes located within a height range that allows the blade to rotate, the majority of the branch tubes located at or below the height of the boss are connected to the header manifold such that their distal ends are positioned at 0 to 50% of the distance from the center, and the majority of the branch tubes located above the height of the boss are connected to the header manifold such that their distal ends are positioned at more than 50% of the distance from the center.

The invention is related to a heat exchanger collector configuration (1) allowing more efficient heat distribution within double-helix heat exchangers of heating systems by connecting the outer helix (14) with the inner helix (13) and minimizing the heat loss of water circulating within the helices. Thanks to the heat exchanger collector configuration (1), the inner helix (13) can be connected to the outer helix (14) without any deformation on its full circular structure. As the full circular structure of the inner helix (13) is not deformed, heat formed within the combustion chamber inside of the inner helix (13) is distributed equally over the helix and thereby, efficiency of heat absorption is increased.

The disclosed technology can include a bypass valve assembly having a partition that can fluidly separate an inlet and an outlet of a fluid heating system. A first bypass valve and a second bypass valve can be mounted to the partition and configured to permit a fluid to flow between the inlet and the outlet. The first bypass valve and the second bypass valve can be configured to transition between a closed state and an open state. The first bypass valve and the second bypass valves can each have a spring configured to transition the respective first and second bypass valve from the closed state in response to experiencing a pressure that is greater than or equal to a respective first or second predetermined pressure. The second predetermined pressure can be greater than the first predetermined pressure.

A heat exchanger comprising a first manifold and a second manifold connected by a bundle of tubes, configured to provide at least an entry pass and an exit pass for a heat exchange fluid, further comprising an inlet port associated with the entry pass and an outlet port associated with the exit pass, wherein the exit pass is fluidically connected with the outlet port through a first opening, the first opening being connected with the outlet port through an additional channel outside of the manifolds, characterized in that the exit pass is further fluidically connected with the outlet port through a second opening so that the path for the heat exchange fluid to the outlet port is shorter from the second opening than from the first opening.

A heat exchanger includes a plurality of flat heat transfer tubes and a header, wherein, in an interior portion of each of the plurality of flat heat transfer tubes, a plurality of upwind side channels and a plurality of downwind side channels are formed, the header includes a main body portion in which an interior portion space connected to the plurality of upwind side channels and the plurality of downwind side channels is formed, a partition member that divides the interior portion space into an upwind side space, and a flow inlet/outlet port that supplies a refrigerant to a lower part of the upwind side space, and, at a lower part of the partition member, a lower communication path that communicates the downwind side space and the upwind side space is formed.

A heat exchanger (5) includes a plurality of flat heat transfer tubes (11) and a header (12), wherein the header (12) includes a first partition member (21) that separates an internal space of a main body unit (20) into a refrigerant inflow portion (24) and an upper portion (25), a second partition member (22) that separates the upper portion (25) into a connected portion (26) connected to the plurality of flat heat transfer tubes (11) and an opposite portion (27), and a third partition member (23) that separates the opposite portion (27) into a windward portion (28) and a leeward portion (29) a plurality of windward communication holes (35) and a plurality of leeward communication holes (36) that allow communication from the windward portion (28) and the leeward portion (29) to the connected portion (26) are arranged the second partition member (22) an adjustment channel (30) that distributes the refrigerant from the refrigerant inflow portion (24) to the windward portion (28) and the leeward portion (29) and that increases a flow rate of the plurality of windward communication holes (35) as compared to a flow rate of the plurality of leeward communication holes (36) is arranged in the header (12).

In one instance, a multistage microchannel condenser is provided for use as an aspect of a heating, ventilating, and air conditioning (HVAC) system. The multistage microchannel condenser includes at least two pluralities of flat tubes having microchannels, each associated with a different refrigeration circuit, that are interspersed so that when only one refrigeration circuit is operational, the multistage microchannel condenser still does not have any substantial thermal dead spots. Manifolds are used on each end of the multistage microchannel condenser to fluidly couple members of the at least two pluralities of flat tubes such that the refrigerant in each refrigeration circuit remains separated while still using a majority of the area of the face of the multistage microchannel condenser. Other aspects are presented.

A heat exchanger includes a core and a header tank. The header tank includes a partition, a first inlet pipe, and a second inlet pipe. The partition divides an inside passage of the header tank into a first tank and a second tank. The first inlet pipe introduces a first fluid into the first tank. The second inlet pipe introduces a second fluid into the second tank. The first inlet pipe is inclined at a predetermined angle except a right angle relative to an outer surface of the header tank such that a flow direction of the first fluid flowing from the first inlet pipe to the first tank includes a component in a predetermined direction from a first end of the first tank provided with the partition to a second end of the first tank opposite to the first end.