A heat exchanger having a first heat exchanger tube and a second heat exchanger tube is disclosed. The first heat exchanger tube can have a first leg, a second leg, and a bend section, and the bend section of the first heat exchanger tube can include three or more bends, each of the three or more bends having a corresponding bend angle that is less than or equal to approximately 90 degrees. The second heat exchanger tube can have a first leg, a second leg, and a bend section, and the bend section of the second heat exchanger tube can include three or more bends, each of the three or more bends having a corresponding bend angle that is less than or equal to approximately 90 degrees.

Systems and methods for improved heat exchange performance are disclosed. The system can include a first slab of refrigerant tubes having an upstream side and a downstream side. The system can further include a second slab of refrigerant tubes having an upstream side and a downstream side. The system can additionally include an airflow distribution device configured to distribute air along the first and second slabs. Further, the downstream side of first slab can be set apart a first distance from the downstream side of the second slab and the upstream side of the first slab can be attached to the upstream side of the second slab. The airflow distribution device can include a perforated plate having perforations of various dimensions or various sized vanes positioned in the path of airflow.

Two or more cores (2a, 2b) in each of which two more types of passage layers through which two or more fluids flow are layered alternately are welded together. The entire bottom portions of the cores (2a, 2b) are covered with a lower header tank (3), thereby making the fluids flow into the cores (2a, 2b). A dummy layer (14) through which none of the fluids flow is provided beside a weld side face of each core (2a, 2b). A weld spacer (18) is welded to the entire peripheral edge of a side plate (16) of the dummy layer (14). A through-hole (16a) for draining water in the dummy layer (14) is made near the lower end of the side plate of the dummy layer (14). Further, a liquid drain hole (20) through which water is drained is made at a lower corner of the weld spacer (18).

A heat exchanger and method for producing such a heat exchanger which during operation in a flow direction is flown through by a medium to be cooled and by two different cooling media. A power plant has a generator cooled by means of a generator cooling gas and a heat exchanger cooling the generator cooling gas.

In a heat exchanger, an outer diameter of a plurality of heat transfer pipes is defined as Do, a wall thickness is defined as tP, an area represented by a numerical expression of a row pitch L1×a step pitch L2 is defined as A, and an area represented by a numerical expression of ((Do−2×tP)/2).sup.2×π is defined as B, a relation of Do<5.5 mm, a relation of (0.0219×tP.sup.2−0.0185×tP+0.0043)×ln(Do)+(1.6950×tP.sup.2+1.8455×tP+1.5416)≤B/A≤(0.2076×tP.sup.2−0.1480×tP+0.0545)×Do{circumflex over ( )}(−0.0021×tP.sup.2−0.0528×tP+0.0164), and a relation of B/A<0.0076×tP.sup.2−0.0417×tP+0.0574 are satisfied.

A heat exchanger includes a heat exchanger body having a first end and a second end opposed to the first end along a flow axis. A plurality of flow channels is defined in the heat exchanger body extending axially with respect to the flow axis. A first set of the flow channels forms a first flow circuit and a second set of the flow channels forms a second flow circuit that is in fluid isolation from the first flow circuit. Each flow channel is fluidly isolated from the other flow channels. The flow channels all conform to a curvilinear profile.

A heat exchanger having a first heat exchanger tube and a second heat exchanger tube is disclosed. The first heat exchanger tube can have a first leg, a second leg, and a bend section, and the bend section of the first heat exchanger tube can include three or more bends, each of the three or more bends having a corresponding bend angle that is less than or equal to approximately 90 degrees. The second heat exchanger tube can have a first leg, a second leg, and a bend section, and the bend section of the second heat exchanger tube can include three or more bends, each of the three or more bends having a corresponding bend angle that is less than or equal to approximately 90 degrees.

The present application discloses a microchannel flat tube and a microchannel heat exchanger. The microchannel flat tube includes a flat tube body and a row of channels. The row of channels is arranged in the flat tube body along a width direction. The row of channels extends through the flat tube body along a length direction. A cross-section of each channel includes a first width in the width direction and a first height in a thickness direction. The row of channels at least includes a first channel, a second channel and a third channel along the width direction. The first widths of the first channel, the second channel and the third channel are decreased at a fixed ratio, thereby facilitating the control of the thickness of the microchannel flat tube and improving the heat exchange efficiency of the third channel.

The present invention relates to an apparatus installed in a vehicle for recovering exhaust heat. The apparatus includes: a housing having therein a heat exchanger and having a front through hole through which exhaust gas is introduced and a rear through hole through which the introduced exhaust gas is discharged; a first tube installed in the housing and having a dual tube structure; and a second tube connected to the first tube and having a dual tube structure. A coolant introduced through the second tube passes through the first tube and exchanges heat with the exhaust gas in the heat exchanger in the housing. The coolant, which has exchanged heat, is discharged to an engine through the first tube and the second tube.

a plurality of first flow ducts and a plurality of second flow ducts adjacent to the plurality of first flow ducts for exchanging heat energy between first flows passing through the plurality of first flow ducts and second flows passing through the plurality of second flow ducts; • a parallel flow region where flow passages and directions of the first flows of the plurality of first flow ducts and adjacent flow passages and directions of the second flows of the plurality of second flow ducts are arranged in locally or tangentially parallel relationship with respect to each other at least in a portion of the parallel flow region and are fluidly separated by wall portions from each other; • wherein a cross section of the wall portions of the parallel flow region orthogonal to a local flow passage direction of the parallel flow region is a grid-like pattern.