Patent ID: 6820685
Filing Date: 2004-11-23
Classification: F28B,F28D

Abstract:
A coil assembly for a heat exchanger, comprising:an array of at least two serpentine circuits, each circuit including longitudinal tube sections of an effective diameter D, return bend sections of an effective diameter D, and inlet and outlet ends, the at least two serpentine circuits are stacked in a staggered planar arrangement with adjacent return bends being at least partially overlapping; at least one of the at least two serpentine circuits being provided with at least one depression area coinciding with the point of overlap with the return bend of an adjacent one of the serpentine circuits, wherein the at least two serpentine circuits are densely packed so that adjacent ones of the serpentine tubes nest in the at least one depression area to provide a circuit-to-circuit packing density D/S greater than 1.02, where S is the spacing between each adjacent circuit and D is the effective diameter of the tubes.