초록 ▼

The present invention is an enhanced tubular heat exchanger for a furnace .Iadd.with the heat tubes of the heat exchanger having two straight sections connected by a bend.Iaddend.. The tubes of the heat exchanger include an enhanced portion which has a smaller cross-sectional area than the flue port

The present invention is an enhanced tubular heat exchanger for a furnace .Iadd.with the heat tubes of the heat exchanger having two straight sections connected by a bend.Iaddend.. The tubes of the heat exchanger include an enhanced portion which has a smaller cross-sectional area than the flue portion, in the form of an elliptically shaped tube. The enhanced portion further includes turbulators to promote the heat exchange from the heated flue gases. Circulation of air around the exterior of the tubes is also facilitated because the enhanced portion is disposed at a small angle relative to the flue portion. A plurality of tubes are disposed within the heat exchanger so that the circulation air first flows over the enhanced portions then over and around the generally cylindrical portions. This lowers the initial pressure drop in the circulation air flow and thereby facilitates the circulation of and heat transfer to the air being heated.

대표청구항 ▼

[ What is claimed is:] [1.] A heat exchanger element for use in a furnace including a burner, an exhaust system, and a heat exchanger having at least one heat exchanger element, said heat exchanger element comprising.[.;.]. .Iadd.: .Iaddend.an elongated tube having .[.an inlet adapted to be operably

[ What is claimed is:] [1.] A heat exchanger element for use in a furnace including a burner, an exhaust system, and a heat exchanger having at least one heat exchanger element, said heat exchanger element comprising.[.;.]. .Iadd.: .Iaddend.an elongated tube having .[.an inlet adapted to be operably connected to the burner, an outlet adapted to be operably connected to the exhaust system, a flue portion located adjacent to said inlet and adapted to receive heated flue gases, and an enhanced portion defined by a substantial axial portion of said elongated tube, said enhanced portion located adjacent to said outlet and adapted to expel said heated flue gases, said enhanced portion being generally flattened and thereby having a smaller cross-sectional area than the cross-sectional area of said flue portion.]. .Iadd.a circular cross-section, said tube having first and second straight sections connected by a bend, said tube having an inlet adapted to be operably connected to the burner, an outlet adapted to be operably connected to the exhaust system, a flue portion including said first straight section and located adjacent to said inlet and adapted to receive said heated flue gases, and an enhanced portion including said second straight section and located adjacent to said outlet and adapted to expel said heated flue gases, said enhanced portion being generally flattened along a majority of its length and thereby having a smaller cross-sectional area than the cross-sectional area of said flue portion..Iaddend.