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Heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems and heat exchangers are provided that include multichannel tube configurations designed to reduce refrigerant pressure drop through a heat exchanger manifold. In certain embodiments, tubes inserted within the manifold adjacen

Heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems and heat exchangers are provided that include multichannel tube configurations designed to reduce refrigerant pressure drop through a heat exchanger manifold. In certain embodiments, tubes inserted within the manifold adjacent to a refrigerant inlet have non-rectangular or recessed end profiles configured to increase flow area near the inlet, thereby reducing a pressure drop through the manifold. In further embodiments, insertion depths of the tubes within the manifold vary based on distance from the inlet. This configuration may establish a larger flow area adjacent to the inlet, thus reducing the pressure drop and increasing heat exchanger efficiency.

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1. A heat exchanger comprising: a first manifold with an inlet configured to receive a fluid;a second manifold; anda plurality of multichannel tubes each having a first end extending within the first manifold and a second end extending within the second manifold, wherein each of the plurality of mul

1. A heat exchanger comprising: a first manifold with an inlet configured to receive a fluid;a second manifold; anda plurality of multichannel tubes each having a first end extending within the first manifold and a second end extending within the second manifold, wherein each of the plurality of multichannel tubes is spaced along a length of the first manifold at a distance from the inlet;wherein the first end of a first multichannel tube adjacent to the inlet includes a first profile, the first end of a second multichannel tube non-adjacent to the inlet includes a second profile, at least the first profile is non-rectangular, a first shape of the first profile is different than a second shape of the second profile, and the first profile is configured to provide a greater flow area through the first manifold than the second profile. 2. The heat exchanger of claim 1, wherein the first profile comprises a concave shape. 3. The heat exchanger of claim 1, wherein the first profile comprises at least one of a curved shape, a chevron shape, a half-hexagon shape, and a half-octagon shape. 4. The heat exchanger of claim 1, wherein the first profile comprises an apex at a lateral position corresponding to a lateral position of the inlet within the first manifold. 5. The heat exchanger of claim 1, wherein each of the plurality of multichannel tubes has a plurality of generally parallel flow paths configured to direct fluid between the first manifold and the second manifold. 6. The heat exchanger of claim 1, wherein each of the first ends includes a non-rectangular profile. 7. The heat exchanger of claim 1, wherein the first end of at least one multichannel tube nonadjacent to the inlet includes a substantially flat profile. 8. The heat exchanger of claim 1, wherein a length of each of the plurality of multichannel tubes is substantially the same. 9. The heat exchanger of claim 1, wherein the second end of the first multichannel tube includes a non-rectangular profile complementary to the first profile. 10. A heat exchanger comprising: a first manifold with an inlet configured to receive a fluid;a second manifold;a first plurality of multichannel tubes having a plurality of generally parallel flow paths configured to direct the fluid between the first manifold and the second manifold, wherein at least one of the first plurality of multichannel tubes adjacent to the inlet includes a recessed end having a first shape and extending into the first manifold, and the recessed end of the at least one of the first plurality of multichannel tubes is configured to provide a greater flow area through the first manifold than an end of another one of the first plurality of multichannel tubes having a second shape and extending into the first manifold non-adjacent to the inlet, wherein the first shape is different than the second shape; anda second plurality of multichannel tubes configured to direct the fluid from the second manifold to the first manifold. 11. The heat exchanger of claim 10, wherein each of the first plurality of multichannel tubes has a recessed end extending into the first manifold, and each of the second plurality of multichannel tubes has a generally straight end extending into the first manifold. 12. The heat exchanger of claim 10, wherein the first plurality of multichannel tubes are spaced along a length of the first manifold, and wherein a curvature of the recessed end progressively increases along the length outwardly from the inlet. 13. The heat exchanger of claim 10, wherein the recessed end includes an apex proximate to a longitudinal axis extending generally parallel to the plurality of flow paths. 14. The heat exchanger of claim 13, wherein a length of the flow paths adjacent to the apex is less than a length of the flow paths nonadjacent to the apex. 15. The heat exchanger of claim 10, wherein the first plurality of multichannel tubes and the second plurality of multichannel tubes have generally flat cross sections. 16. A heat exchanger comprising: a first manifold with an inlet configured to receive a fluid;a second manifold;a first plurality of multichannel tubes configured to direct the fluid from the first manifold to the second manifold and each extending within the first manifold at a first insertion depth, wherein the first insertion depth of a first multichannel tube of the first plurality of multichannel tubes adjacent to the inlet is less than the first insertion depth of a second multichannel tube of the first plurality of multichannel tubes non-adjacent to the inlet and longitudinally offset from the first multichannel tube in a first direction, and the first insertion depth of the first multichannel tube is less than the first insertion depth of a third multichannel tube of the first plurality of multichannel tubes non-adjacent to the inlet and longitudinally offset from the first multichannel tube in a second direction, opposite the first direction, to establish a greater flow area through the first manifold adjacent to the inlet; anda second plurality of multichannel tubes configured to direct the fluid from the second manifold to the first manifold. 17. The heat exchanger of claim 16, wherein the first insertion depth progressively increases along a length of the first manifold in the first direction and in the second direction. 18. The heat exchanger of claim 17, wherein the first insertion depth increases as the distance from the inlet increases. 19. The heat exchanger of claim 17, wherein each of the first plurality of multichannel tubes is substantially the same length. 20. The heat exchanger of claim 17, wherein each of the first plurality of multichannel tubes extends within the second manifold at a second insertion depth that progressively decreases along a length of the second manifold in the first direction. 21. The heat exchanger of claim 16, wherein each of the first plurality of multichannel tubes comprise a first end extending within the first manifold and a second end extending within the second manifold, the first end of at least one of the first plurality of multichannel tubes having a concave shape. 22. The heat exchanger of claim 21, wherein the second end of the at least one of the first plurality of multichannel tubes has a convex shape complementary to the concave shape.