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A finned tube heat exchanger includes a plurality heat-transfer fins and a plurality of heat-transfer tubes. The heat-transfer fins are disposed along an airflow direction. The plurality of heat-transfer tubes are inserted into the heat-transfer fins and arranged in a direction substantially orthogo

A finned tube heat exchanger includes a plurality heat-transfer fins and a plurality of heat-transfer tubes. The heat-transfer fins are disposed along an airflow direction. The plurality of heat-transfer tubes are inserted into the heat-transfer fins and arranged in a direction substantially orthogonal to the airflow direction. Each of the heat transfer fins includes a plurality of sets of cut-and-raised parts with each set being straightly aligned from the upstream side toward the downstream side. At least one set of cut-and-raised parts is connected by a straight line sloped relative to the airflow direction. Each of the heat transfer fins includes a plurality of concavities with each concavity formed on a periphery of one of the heat-transfer tubes at least partially below a horizontal plane that passes through a center axis of the heat-transfer tubes and lies on an upper surface of the heat transfer fin having the concavity formed therein.

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1. A finned tube heat exchanger comprising: a plurality of heat-transfer fins disposed along an airflow direction; anda plurality of heat-transfer tubes inserted into the heat-transfer fins and arranged in a direction substantially orthogonal to the airflow direction and the heat-transfer tubes bein

1. A finned tube heat exchanger comprising: a plurality of heat-transfer fins disposed along an airflow direction; anda plurality of heat-transfer tubes inserted into the heat-transfer fins and arranged in a direction substantially orthogonal to the airflow direction and the heat-transfer tubes being arranged with respect to each other in a vertical direction,a first axis extending in a first direction and being perpendicular to and passing through longitudinal center axes of the heat transfer tubes, the longitudinal center axes being parallel to a second vertical direction, and the airflow direction being parallel to a third direction that is perpendicular to the first and second directions,a plurality of annular collar parts protruding to one side in a plate thickness direction of each of the heat-transfer fins, with each of the heat-transfer tubes being in close contact with an inside surface of one of the annular collar parts protruding from each of the heat transfer fins,each of the heat transfer fins including a first set of cut-and-raised parts formed below each of the heat-transfer tubes with each first set of cut-and-raised parts being aligned along two sides from an upstream side toward a downstream side in the airflow direction anda second set of cut-and-raised parts formed above each of the heat-transfer tubes with each second set of cut-and-raised parts being aligned along two sides from an upstream side toward a downstream side in the airflow direction,each of the first set of cut-and-raised parts and the second set of cut-and-raised parts being formed by cut-and-raise machining,the first set of cut-and-raised parts and the second set of cut-and-raised parts being connected by first and second straight lines, respectively, that are sloped relative to the airflow direction as viewed along the second direction in order to guide airflow in the vicinity of the heat-transfer tubes to the rearward sides of the heat-transfer tubes in the airflow direction,the first straight line and the first set of cut-and-raised parts being parallel as viewed along the second direction, and the second straight line and the second set of cut-and-raised parts being parallel as viewed along the second direction,the first and second sets of cut-and-raised parts being disposed between a pair of heat transfer tubes that are directly adjacent to each other, the directly adjacent heat transfer tubes being aligned with each other as viewed along a direction parallel to the first axis, the first set of cut-and-raised parts being aligned with each other along the first straight line as viewed along the second direction, and the second set of cut-and-raised parts being aligned with each other along the second straight line as viewed along the second direction,the first and second sets of cut-and-raised parts disposed between the directly adjacent heat transfer tubes being at least partially aligned with the directly adjacent heat transfer tubes as viewed along the first direction,among the first set of cut-and-raised parts at least one first cut-and-raised part in a region nearest to each of the heat-transfer tubes being formed by cut-and-raise machining from the top toward the bottom, and at least one slit being formed between the at least one first cut-and-raised part and each heat-transfer tube, andeach of heat transfer fins further including a plurality of concavities with each of the concavities formed by concaving in a direction opposite from a direction in which each of the collar parts protrudes on a periphery of one of the heat-transfer tubes at least partially below a horizontal plane that passes through a center axis of the heat-transfer tubes. 2. The finned tube heat exchanger according to claim 1, wherein each of the concavities is formed about an entirety of the periphery of one of the heat-transfer tubes. 3. The finned tube heat exchanger according to claim 1, wherein each of the heat-transfer fins has linear sections extending laterally that are inclined in alternating plate thickness directions as each section extends in the airflow direction. 4. The finned tube heat exchanger according to claim 1, wherein each of the concavities has a lower end part extending to a pointed first point and an upper end part extending to a pointed second point such that each concavity has a protruding shape toward the lower and upper end parts thereof. 5. The finned tube heat exchanger according to claim 1, wherein each of the concavities has a lower end part extending to a pointed first point such that each concavity has a protruding shape toward the lower end part thereof. 6. The finned tube heat exchanger according to claim 3, wherein the linear sections are shaped as concave folds; andeach of the concavities has a lower end part extending to a pointed first point such that each concavity has a protruding shape toward the lower end part thereof, and each of the concavities is formed so that the lower end part thereof is aligned with one of the concave folds. 7. The finned tube heat exchanger according to claim 6, wherein the first cut-and-raised parts are arranged such that a region of each heat transfer fin directly below each heat-transfer tube is free of cut-and-raised parts. 8. The finned tube heat exchanger according to claim 6, wherein the first straight line that connects the first set of cut-and-raised parts is sloped in relation to a third straight line that passes through the center axis of the heat-transfer tubes and is parallel to the airflow direction so that the downstream side of the fourth straight line is farther away from the third straight line than the upstream side of the fourth straight line; andthe second straight line that connects the second set of cut-and-raised parts is sloped in relation to the third straight line so that the downstream side of the second straight line is closer to the third straight line than the upstream side of the second straight line. 9. The finned tube heat exchanger according to claim 2, wherein each of the heat-transfer fins has linear sections extending laterally that are inclined in alternating plate thickness directions as each section extends in the airflow direction. 10. The finned tube heat exchanger according to claim 9, wherein the linear sections are shaped as concave folds; andeach of the concavities has a lower end part extending to a pointed first point such that each concavity has a protruding shape toward the lower end part thereof, and each of the concavities is formed so that the lower end part thereof is aligned with one of the concave folds. 11. The finned tube heat exchanger according to claim 10, wherein the first cut-and-raised parts are arranged such that a region of each heat transfer fin directly below each heat-transfer tube is free of cut-and-raised parts. 12. The finned tube heat exchanger according to claim 11, wherein the first straight line that connects the first set of cut-and-raised parts is sloped in relation to a third straight line that passes through the center axis of the heat-transfer tubes and is parallel to the airflow direction so that the downstream side of the fourth straight line is farther away from the third straight line than the upstream side of the fourth straight line; andthe second straight line that connects the second set of cut-and-raised parts is sloped in relation to the third straight line so that the downstream side of the second straight line is closer to the third straight line than the upstream side of the second straight line. 13. The finned tube heat exchanger according to claim 10, wherein the first straight line that connects the first set of cut-and-raised parts is sloped in relation to a third straight line that passes through the center axis of the heat-transfer tubes and is parallel to the airflow direction so that the downstream side of the fourth straight line is farther away from the third straight line than the upstream side of the fourth straight line; andthe second straight line that connects the second set of cut-and-raised parts is sloped in relation to the third straight line so that the downstream side of the second straight line is closer to the third straight line than the upstream side of the second straight line. 14. The finned tube heat exchanger according to claim 2, wherein each of the concavities has a lower end part extending to a pointed first point and an upper end part extending to a pointed second point such that each concavity has a protruding shape toward the lower and upper end parts thereof. 15. The finned tube heat exchanger according to claim 2, wherein each of the concavities has a lower end part extending to a pointed first point such that each concavity has a protruding shape toward the lower end part thereof. 16. The finned tube heat exchanger according to claim 7, wherein the first straight line that connects the first set of cut-and-raised parts is sloped in relation to a third straight line that passes through the center axis of the heat-transfer tubes and is parallel to the airflow direction so that the downstream side of the fourth straight line is farther away from the third straight line than the upstream side of the fourth straight line; andthe second straight line that connects the second set of cut-and-raised parts is sloped in relation to the third straight line so that the downstream side of the second straight line is closer to the third straight line than the upstream side of the second straight line. 17. The finned tube heat exchanger according to claim 1, wherein all of the cut-and-raised parts on the heat-transfer fins below the heat-transfer tubes are formed by cut-and-raise machining from the top toward the bottom and slits are formed between each of the heat-transfer tubes and each of the cut-and-raised parts.