JPS6446585A - Finned heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heating operation capacity when frosted as well as the defrosting capability by a constitution in which the fin width is set in a certain range relative to the outer diameter of heat transmission pipe, the pitch of pipe winding that is normal to the air flow direction is made equal to the fin width, and the heat transmission pipe is wound in a row relative to the air flow direction. CONSTITUTION:A heat exchanger 10 comprises fins 11 which are equally spaced in parallel to allow the passage of air flow 13, and a heat transmission pipe 12 having the outer diameter D which is routed perpendicularly routed through the fins and carries a flowing fluid in it. The fin width L1 is set as 2.4D0<=L1<=2.7D0, and the pipe winding pitch L2 perpendicular to the air flow 13 is set as L1=L2. One row of the heat transmission pipe 12 is disposed relative to the air flow 13. Because the fin width L1 is 2.4D0<=L1<=2.7D0, the fin pitch FP can be widened, ensuring the a practically adequate heating operation capacity, and the heat exchanging quantity per unit cost can be maximized. Further, since the fin width L1 is equal to the vertical pipe pitch L2, the heat can be uniformly transferred from the heat transmission pipe 12 to the fins 11, improving the defrosting efficiency.