Tube bundle heat exchanger and waste gas heat recovery device

Abstract

The invention relates to a tube bundle heat exchanger having a plurality of tube windings ( 1 ) through which a heat transfer medium flows in parallel. The tube windings start from a common inlet chamber ( 2 ) for the heat transfer medium and open into a common outlet chamber ( 3 ). Each tube winding comprises an alternating sequence of tube sections ( 6 ) running alternately in two planes parallel to each other, and tube bends ( 7 ) connecting same, wherein within each of the two planes four or more pipe sections extend disposed side by side or parallel to each other, and wherein the pipe bends are designed to have a change of direction through 180° with respect to an associated bend axis and have the same bend radii. The invention is characterised in that along each tube winding the bend axes of tube bends that are connected to the same tube section are positioned at an angle of between 85° and 95° to each other, and the bend axes of tube bends, between which a tube section, a tube bend and a further tube section are arranged in immediate sequence, run parallel.

1 : A tube bundle heat exchanger having
 a plurality of tube windings through which a heat transfer medium flows in parallel, which tube windings start from a common inlet chamber for the heat transfer medium and open into a common outlet chamber;   whereas each tube winding has an alternating sequence of tube sections running alternately in two planes parallel to each other as well as tube bends connecting said sections, whereas within each of the two planes four or more tube sections extend, arranged side by side or parallel to one another and   wherein the tube bends are designed to have a change of direction of 180° with respect to an associated bend axis and have the same bend radii;   characterised in that   along each tube winding the bend axes of tube bends, which are connected to the same tube section, are positioned at an angle of 85°-95° to each other and the bend axes of tube bends run parallel, between which are arranged in immediate sequence a tube section, a tube bend and a further tube section.   
     
     
         2 : The tube bundle heat exchanger according to  claim 1 , characterised in that both planes which are parallel to one another are vertical on an inlet plane, inside which inlets are positioned into the tube windings from the common inlet chamber, and are in particular vertical on an outlet plane parallel to the inlet plane, inside which outlets are positioned from the tube windings into the common outlet chamber. 
     
     
         3 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube sections have a matching length. 
     
     
         4 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube sections are designed as straight tube sections. 
     
     
         5 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube bends have a matching geometry. 
     
     
         6 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube bends are designed as semi-circular arcs with a level running central line. 
     
     
         7 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube windings have a matching geometry and form a pile of windings abutting against one another. 
     
     
         8 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the bend axes of tube bends, which are connected to the same tube section, have an angular position (a) of 90°. 
     
     
         9 : The tube bundle heat exchanger according to  claim 1  or  2 , characterised in that the tube sections and tube bends are materially connected to each tube winding or the tube winding is formed as a single piece. 
     
     
         10 : A waste gas heat recovery device with an evaporator for a heat transfer medium, which is acted upon by a exhaust-gas flow of an internal combustion engine, characterised in that the evaporator includes a tube bundle heat exchanger according to  claim 1 . 
     
     
         11 : The waste gas heat recovery device according to  claim 10 , characterised in that the main flow direction of the exhaust-gas flow runs substantially vertically or parallel to the tube sections of the tube bundle heat exchanger. 
     
     
         12 : The waste gas heat recovery device according to  claim 10  or  11 , characterised in that the tube windings of the tube bundle heat exchanger consist of stainless steel.