A heat exchanger includes: a plurality of first heat transfer tubes, a plurality of second heat transfer tubes located on leeward side relative to the plurality of first heat transfer tubes, a first distribution unit connecting the first ends of the plurality of first heat transfer tubes and the third ends of the plurality of second heat transfer tubes. The first distribution unit includes a flow rate control unit configured to be capable of switching between a first state and a second state. In the first state, refrigerant flows in the plurality of first heat transfer tubes and the plurality of second heat transfer tubes. In the second state, in only the plurality of first heat transfer tubes, a flow rate of the refrigerant is smaller than a flow rate of the refrigerant in the first state.

A heat exchanger includes: a plurality of first heat transfer tubes, a plurality of second heat transfer tubes located on leeward side relative to the plurality of first heat transfer tubes, a first distribution unit connecting the first ends of the plurality of first heat transfer tubes and the third ends of the plurality of second heat transfer tubes. The first distribution unit includes a flow rate control unit configured to be capable of switching between a first state and a second state. In the first state, refrigerant flows in the plurality of first heat transfer tubes and the plurality of second heat transfer tubes. In the second state, in only the plurality of first heat transfer tubes, a flow rate of the refrigerant is smaller than a flow rate of the refrigerant in the first state.

Provided is an evaporator including a header in which a depressed portion is formed by concavely depressing downwards a transverse central portion in a longitudinal direction from an upper surface, the portion in which the depressed portion is formed protrudes downwards to form a pair of partitions spaced apart from each other, and a communication hole is formed in a penetrating manner in a transverse direction in each of the pair of partitions; a tank in which a transverse central portion is coupled to a lower end of the partition of the header and both sides in the transverse direction are coupled to the header; and an insert plate inserted into the depressed portion of the header such that both surfaces are tightly attached to the pair of partitions, and having a through hole provided at a position corresponding to the communication holes provided in the pair of partitions.

A heat exchanger system includes a heat exchange main unit having a gas channel and a fluid channel configured such that a fluid in the fluid channel can exchange heat with a flue gas in the gas channel, a housing, a drain collecting part arranged to collect condensate from the flue gas, and a siphon attached to the drain collecting part to prevent release of the flue gas from a condensate outlet. The siphon has a tubular body, first portion having a condensate inlet, and second portion having the condensate outlet and an operation member. When the tubular body is attached to the drain collecting part, the first portion is connected to the drain collecting part, the first and second portions can be at least partially located inside and outside the housing, and the operation member can be located outside the housing. The first and second portions are detachably attached.

Planar element adapted to form, when stacked with a plurality of other such elements, a heat exchanger, comprising an inlet region, a first zone adapted to direct flow from the inlet region towards a second zone, a second zone comprising at least one cutout in the plane of the planar element, adapted to accommodate a cooling core, a third zone, adapted to direct flow from the second zone towards an outlet region and an outlet region, the planar element comprising a first blockage protrusion disposed along a first group of said side edges, the first group comprising at least a side edge adjacent to said outlet region, and a second blockage protrusion disposed along a second group of said side edges, the second group comprising at least a side edge adjacent to said inlet region.

A heat exchanger includes: a cooler/heater, an evaporator and a condensate separator, provided with inlet lines and outlet lines through which flows develop in countercurrent to each other for obtaining through the cooler/heater an incoming flow of hot and humid air and an outgoing flow of cooled cold air. The cooler/heater, the evaporator and the condensate separator are independent units from each other joined by a connection for defining a single-block body on whose outer surface inlet lines and outlet lines are provided. A first conduit places in communication the outlet line with the second inlet line; a second conduit places in communication the first outlet line with the first inlet line; and a third conduit places in communication the first outlet line with the first inlet line. The conduits project from the outer surface that delimits the single-block body.

A heat exchanger includes: a plate-like fin having one end and an other end in a first direction; and a first heat transfer tube and a second heat transfer tube that each extends through the fin and that are adjacent to each other in a second direction. A portion to which the fin and the first heat transfer tube are connected and a clearance portion that separates between the fin and the first heat transfer tube are disposed between the fin and the first heat transfer tube. The clearance portion is disposed at one end side in the first direction relative to an imaginary center line that passes through a center of the first heat transfer tube in a long side direction and that extends along a short side direction.

A refrigerator includes an evaporator inclined in a left-right direction and a defrosting water tray provided below the evaporator to collect defrosting water, and having inclined surfaces corresponding to a shape of the evaporator.

A heat exchanger coil and a heat exchanger having the same. The heat exchanger coil includes: a plurality of flat tubes, each flat tube having a length direction oriented along a vertical direction; and a plurality of fins, in which each fin is disposed between adjacent flat tubes and includes a plurality of fin units arranged along the length direction of the flat tube and sequentially connected into a corrugated shape, each fin unit has a windward end portion and a leeward end portion opposite to each other in a width direction of the flat tube, and at least one end portion of the windward end portion and the leeward end portion of each fin unit extends beyond the plurality of flat tubes along the width direction of the flat tube and is provided with a drain hole.

A defrosting system for defrosting an evaporator assembly is disclosed. The system includes the evaporator assembly, an electrically resistive coating having an electrically insulative matrix and a conductive doping agent disposed on at least one surface of the evaporator assembly, and a plurality of electrical terminals arranged and disposed to supply electricity to the electrically resistive coating. A method for defrosting an evaporator assembly and a coating for heating evaporator assemblies are also disclosed.