Patent ID: 9568212
Date: 2017-02-14
CPC Classifications: F24D,F24H,F28D,F28F,Y02B

Claim:
1. A heat exchanger comprising: (a) a generally cylindrical housing comprising a cylindrical wall having an upper section and a lower section, an upper opening, a lower opening, a lumen, and a central longitudinal axis, wherein said lumen connects said upper opening to said lower opening; (b) a generally cylindrical burner comprising an open upper end, a closed lower end and a cylindrical wall connecting said open upper end and said closed lower end, wherein said cylindrical wall comprises a plurality of regularly spaced apart apertures; (c) a helix coil comprising a plurality of coil loops defined by a first coil section, a second coil section and two end coil loops wherein each of said two end coil loops is terminated with an inlet port or an outlet port, a plurality of heat transfer fins, an inner perimeter, an outer perimeter, an external helix coil diameter, a central longitudinal axis and a lumen, wherein said plurality of heat transfer fins are placed in thermal contacting engagement with said plurality of coil loops and said two end coil loops and an offset is disposed between adjacent coil loops to leave space between adjacent coil loops; and (d) at least one rope seal having an uncompressed cross-sectional shape that is substantially round, said at least one rope seal is configured to be disposed on at least a portion of said helix coil between adjacent coil loops, reducing the space between adjacent coil loops to result in reduced openings between said adjacent coil loops, wherein said inlet port of said helix coil receives incoming cold water and outputs heated water via said outlet port of said helix coil, said external helix coil diameter is substantially the same as the diameter of said lumen of said housing, said helix coil is disposed within said housing such that said central longitudinal axis of said helix coil is substantially collinear to said central longitudinal axis of said housing, said first coil section substantially surrounds said burner, and said first coil section is disposed atop said second coil section and flue from said burner is configured to flow through said reduced openings to more effectively impinge upon said adjacent coil loops and heat transfer fins of said adjacent coil loops.