Heat exchanger assembly with integral fin unit

In a heat exchanger assembly, the combination comprising:

• a heat transfer array generally rectangular in shape and having a forward surface and a rearward surface, said array including a flat sheet of a heat radiating material folded back and forth upon itself in accordion-like fashion defining a plurality of fins on the forward surface of said array, each fin extending transversely of said array with said plurality of fins being disposed in a parallel spaced relationship along the longitudinal extent of said array;
• each fin having a plurality of notches therein spaced apart transversely of the fin, the notches in said fins being aligned in sets longitudinally of said array defining a plurality of longitudinally extending pathways along the forward surface of said array;
• and a single length of heat exchange tubing wrapped around said heat transfer array longitudinally thereof in a generally helical form, defining alternate forward and rearward pass portions along the length of said tubing with a return bend portion between each forward and rearward pass portion, said forward pass portions extending generally parallel to one another longitudinally along the forward surface of said array and each threading a different set of aligned notches and said rearward pass portions extending generally parallel to one another longitudinally along the rearward surface of said array with said return bend portions interconnecting said forward and rearward pass portions.

In a heat exchanger assembly, the combination comprising:

• a first fin unit;
• a second fin unit;
• each of said fin units being of a unitary construction and having a forward surface and a rearward surface, each fin unit defining a plurality of fins arranged on its forward surface in rows which extend longitudinally of the fin unit each fin having a plurality of notches therein spaced apart transversely of the fin and the notches in said fins being aligned in sets extending longitudinally of the fin unit, defining parallel pathways extending along the forward surfaces of said fin units;
• and
• a single length of heat exchange tubing;
• said first and second fin units being assembled together with rearward surfaces adjacent to one another, and said heat exchange tubing being wrapped around the thus assembled fin units longitudinally thereof threading said notches thereof.