Patent ID: 8851156

Claim:
A freeze protection system for a heat exchanger comprising: a series of three matingly conformed hollow polygonal prisms that have different cross sectional profiles and are geometrically shaped to cooperatively interlock so that they may be spatially arranged within a heat exchanger's headers in a repeating pattern so as to form fluid paths between adjacent heat exchanger tubes; at least one first hollow polygonal prism having six sides and a two parallel, planar end first faces; at least one second hollow polygonal prism having four sides and two parallel planar end second faces; and at least one third hollow polygonal prism having four sides and two parallel, planar end third faces; wherein said hollow polygonal prisms matingly conform about each other around a heat exchanger tube to form a series of fluid paths within said heat exchanger header; and wherein said first hollow polygonal prism has six first hollow polygonal prism exterior walls made up of three substantially similar first convex curved exterior walls having a first radius wherein said first convex curved exterior walls are connected by three first concave curved exterior walls having a second radius; and wherein said second hollow polygonal prism has four, second hollow polygonal prism concave curved exterior walls made of two substantially similar length second concave curved exterior walls of said first radius, connected at a first end by a longer third concave curved exterior wall having a third radius and at a second end by a fourth concave curved exterior wall of said second radius; and wherein said third hollow polygonal prism has four third hollow polygonal prism curved walls made of two substantially similar fifth convex curved exterior walls of said second radius that connect and hold parallel a short sixth concave curved exterior wall of said first radius and a longer second convex curved exterior wall of said third radius.