Patent ID: 6026801
Filing Date: 2000-02-22
Classification: F24H,F28D

Abstract:
An apparatus for transferring heat to a fluid from combustion gases comprising:a housing, wherein said housing includes a cylindrical interior portion extending along a longitudinal axis between a first and a second end;a burner positioned at said first end in said interior portion, wherein said burner is adapted to create heated combustion gases which can flow through said interior portion and exit the housing at said second end of said interior portion;tubing extending helically about the longitudinal axis from said first end to said second end of the interior portion, wherein said tubing bounds a first flow path for the combustion gases which is aligned with the longitudinal axis, wherein said tubing is adapted to allow fluid to enter said tubing at the first end of the interior portion, whereby said fluid can exit said interior portion at said second end after being heated in said tubing by said combustion gases, wherein said tubing includes a fin portion which extends radially about an exterior wall of said tubing, wherein said fin portion extends helically about said tubing, wherein said fin portion and said exterior wall of said tubing forms a second flow path for said combustion gases; anda generally cylindrical core member positioned along said longitudinal axis in the interior portion to generally block said first flow path, whereby said combustion gases are directed by said core member into said second flow path, thus increasing heat transfer from said combustion gases.