Patent ID: 6227289
Filing Date: 2001-05-08
Classification: F28F

Abstract:
A finned heat exchanger through which a stream of air may flow, comprising:a plurality of fins spaced at specific intervals and having a pair of surfaces parallel to each other;a plurality of rows of heat transfer tubes, said tubes inserted through the fins at a right angle to the fins, with each row having a plurality of tubes disposed in a straight row at specific pitch in a direction at right angle to the principal direction of an air stream, and with said plurality of rows arranged at a specific pitch in a principal direction that is transverse to the air stream;main plural raised portions disposed only on one of the surfaces of each of the fins between adjacent heat transfer tubes in a direction that is transverse to the air stream; andplural slits provided on the surface of each of the fins near the middle of each fin, between adjacent rows of heat transfer tubes in the principal direction of the air stream, and in the portion of each fin having a temperature difference between fluids flowing in adjacent heat transfer tubes in the principal direction of the air stream, wherein each of said plural slits are formed by cutting a respective fin in a manner whereby no portion of the fin is removed, and furtherwherein the width of the raised portions in the principal direction of air stream is nearly 1/3 of the distance between adjacent raised portions in the principal direction of the air stream.