Heat exchanger

Abstract

A heat exchanger includes: a heat transfer tube that extends in a second direction that crosses a first direction in which gas flows, and a fin that is provided to the heat transfer tube and has a surface that extends in the first direction and the second direction. The fin has a first extension part and a second extension part, the first extension part has a first heat-transfer-enhancement area that is located further upstream in a flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient, and the second extension part has a second heat-transfer-enhancement area that is located further downstream in the flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient.

1 . A heat exchanger comprising:
 a heat transfer tube that extends in a second direction that crosses a first direction in which gas flows; and   a fin that is provided to the heat transfer tube and has a surface that extends in the first direction and the second direction,   the fin having a first extension part and a second extension part,   the first extension part having a first heat-transfer-enhancement area that is located further upstream in a flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient,   the second extension part having a second heat-transfer-enhancement area that is located further downstream in the flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient,   the first heat-transfer-enhancement area having   a plurality of first heat-transfer-enhancement parts that are arranged in the second direction and each improve a heat transfer coefficient, and   a first flat part provided between adjacent ones of the plurality of first heat-transfer-enhancement parts in the second direction,   the second heat-transfer-enhancement area having   a plurality of second heat-transfer-enhancement parts that are arranged in the second direction and each improve a heat transfer coefficient, and   a second flat part provided between adjacent ones of the plurality of second heat-transfer-enhancement parts in the second direction,   the plurality of first heat-transfer-enhancement parts, the plurality of second heat-transfer-enhancement parts, the first flat part, and the second flat part each having an equal length in the second direction,   the plurality of first heat-transfer-enhancement parts being each arranged in the second direction at a same position as the corresponding second flat part in the second heat-transfer-enhancement area in the second direction,   the first flat part being provided in the second direction at a same position as a corresponding one of the plurality of second heat-transfer-enhancement parts in the second heat-transfer-enhancement area in the second direction.   
     
     
         2 . (canceled) 
     
     
         3 . The heat exchanger of  claim 1 , wherein
 the plurality of first heat-transfer-enhancement parts and the first flat part are alternately arranged in the second direction,   the plurality of second heat-transfer-enhancement parts and the second flat part are alternately arranged in the second direction,   the second flat part is provided in the second heat-transfer-enhancement area side by side with the plurality of first heat-transfer-enhancement parts in the first direction, and   the plurality of second heat-transfer-enhancement parts are arranged in the second heat-transfer-enhancement area side by side with the first flat part in the first direction.   
     
     
         4 . The heat exchanger of  claim 1 , wherein the heat transfer tube has a plurality of heat transfer tubes spaced apart from each other at a predetermined interval in a third direction that crosses the first direction and the second direction. 
     
     
         5 . (canceled) 
     
     
         6 . The heat exchanger of  claim 1 , wherein,
 in the plurality of first heat-transfer-enhancement parts, any of a cut and bent-up part, a slit, a louver, and an uneven part is formed,   in the plurality of second heat-transfer-enhancement parts, any of a cut and bent-up part, a slit, a louver, and an uneven part is formed, and   a sum of a count of any of one or more of the cut and bent-up parts, slits, louvers, and uneven parts formed in the first direction in each of the plurality of first heat-transfer-enhancement parts, and a count of any of one or more of the cut and bent-up parts, slits, louvers, and uneven parts formed in the first direction in each of the plurality of second heat-transfer-enhancement parts is constant.   
     
     
         7 . The heat exchanger of  claim 1 , wherein
 at least one of the plurality of first heat-transfer-enhancement parts are any of a cut and bent-up part, a slit, a louver, and an uneven part, and   at least one of the plurality of second heat-transfer-enhancement parts are any of a cut and bent-up part, a slit, a louver, and an uneven part.   
     
     
         8 . The heat exchanger of  claim 6 , wherein
 any one of the slit, the louver, and the uneven part is formed in the plurality of first heat-transfer-enhancement parts in a first pattern,   any one of the slit, the louver, and the uneven part is formed in the plurality of second heat-transfer-enhancement parts in a second pattern, and   the first pattern and the second pattern are displaced from each other in the second direction.   
     
     
         9 . A heat exchanger comprising:
 a heat transfer tube that extends in a second direction that crosses a first direction in which gas flows; and   a fin that is provided to the heat transfer tube and has a surface that extends in the first direction and the second direction,   the fin having a first extension part and a second extension part,   the first extension part having a first heat-transfer-enhancement area that is located further upstream in a flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient,   the second extension part having a second heat-transfer-enhancement area that is located further downstream in the flow of the gas than the heat transfer tube in the first direction and improves a heat transfer coefficient,   the first heat-transfer-enhancement area having   a plurality of first heat-transfer-enhancement parts that are arranged in the second direction and each improve a heat transfer coefficient, and   a first flat part provided between adjacent ones of the plurality of first heat-transfer-enhancement parts in the second direction,   the second heat-transfer-enhancement area having   a plurality of second heat-transfer-enhancement parts that are arranged in the second direction and each improve a heat transfer coefficient, and   a second flat part provided between adjacent ones of the plurality of second heat-transfer-enhancement parts in the second direction,   the exchanger further comprising a first set including the heat transfer tube and the fin and a second set including the heat transfer tube and the fin,   the heat transfer tube in the second set being spaced apart from the heat transfer tube in the first set in the first direction,   the plurality of second heat-transfer-enhancement parts being formed in the fin in the first set at positions different in the second direction from positions of the plurality of first heat-transfer-enhancement parts formed in the fin in the second set.   
     
     
         10 . The heat exchanger of  claim 9 , wherein
 the plurality of first heat-transfer-enhancement parts and the first flat part are alternately arranged in the second direction,   the plurality of second heat-transfer-enhancement parts and the second flat part are alternately arranged in the second direction,   the second flat part is provided in the second heat-transfer-enhancement area side by side with the plurality of first heat-transfer-enhancement parts in the first direction, and   the plurality of second heat-transfer-enhancement parts are arranged in the second heat-transfer-enhancement area side by side with the first flat part in the first direction.   
     
     
         11 . The heat exchanger of  claim 9 , wherein the heat transfer tube has a plurality of heat transfer tubes spaced apart from each other at a predetermined interval in a third direction that crosses the first direction and the second direction. 
     
     
         12 . The heat exchanger of  claim 9 , wherein,
 in the plurality of first heat-transfer-enhancement parts, any of a cut and bent-up part, a slit, a louver, and an uneven part is formed,   in the plurality of second heat-transfer-enhancement parts, any of a cut and bent-up part, a slit, a louver, and an uneven part is formed, and   a sum of a count of any of one or more of the cut and bent-up parts, slits, louvers, and uneven parts formed in the first direction in each of the plurality of first heat-transfer-enhancement parts, and a count of any of one or more of the cut and bent-up parts, slits, louvers, and uneven parts formed in the first direction in each of the plurality of second heat-transfer-enhancement parts is constant.   
     
     
         13 . The heat exchanger of  claim 9 , wherein
 at least one of the plurality of first heat-transfer-enhancement parts are any of a cut and bent-up part, a slit, a louver, and an uneven part, and   at least one of the plurality of second heat-transfer-enhancement parts are any of a cut and bent-up part, a slit, a louver, and an uneven part.   
     
     
         14 . The heat exchanger of  claim 12 , wherein
 any one of the slit, the louver, and the uneven part is formed in the plurality of first heat-transfer-enhancement parts in a first pattern,   any one of the slit, the louver, and the uneven part is formed in the plurality of second heat-transfer-enhancement parts in a second pattern, and   the first pattern and the second pattern are displaced from each other in the second direction.