Heat exchanger for air conditioner

A heat exchanger for an air conditioner having a plurality of parallel heat exchanging tubes passing through flat fins perpendicular thereto, the tubes including pairs of vertically spaced tubes, the flat fins being arranged in parallel to each other at predetermined intervals to enable air to flow between adjacent fins in a direction perpendicular to axes of the tubes, and each heat exchanging tube adapted to conduct fluid, the heat exchanger comprising:

• a plurality of louvers formed in each fin between each pair of vertically spaced tubes, each plurality of louvers including:
• a pair of first and second vertically spaced louvers defining upstream-most louvers of the plurality of louvers with reference to a direction of air flow,
• second and third vertically spaced louvers defining downstream-most louvers of the plurality of louvers with reference,
• fifth and sixth vertically spaced louvers disposed immediately downstream of the first and second louvers,
• seventh and eighth vertically spaced louvers disposed immediately upstream of the second and third louvers,
• ninth and tenth louvers extending vertically, the ninth louver disposed immediately downstream of the fifth and sixth louvers, the tenth louver disposed immediately upstream of the seventh and eighth louvers, and
• an eleventh louver extending vertically and situated between the ninth and tenth louvers, the eleventh louver being longer than either of the ninth and tenth louvers, and extending upwardly and downwardly past the ninth and tenth louvers,
• the first and second louvers converging toward one another in a direction opposite the direction of air flow,
• the third and fourth louvers converging toward one another in the direction of air flow,
• the fifth and sixth louvers converging toward one another in a direction opposite the direction of air flow,
• the seventh and eighth louvers converging toward one another in the direction of air flow,
• the first, second, third, fourth, ninth and tenth louvers projecting from a first side of the fin,
• the fifth, sixth, seventh, eighth, and eleventh louvers projecting from a second side of the fin disposed opposite the first side,
• each of the first, third, fifth, and seventh louvers having a pair of parallel side edges extending generally radially with respect to an upper one of the respective pair of tubes,
• each of the second, fourth, sixth and eighth louvers having a pair of parallel side edges extending generally radially with respect to a lower one of the respective pair of tubes;
• and
• first and second beads formed, respectively, upstream and downstream of each of the heat exchanging tubes, thereby enlarging an effective surface area of the flat fins, and reinforcing the flat fins.