Sectional heat exchanger for use in a heat cell

Abstract

A sectional heat exchanger for a condensing heat cell comprises two end segments and one or more than one intermediate segment(s). The one or the more than one intermediate segment(s) and the two end segments are assembled in the heat exchanger. A combustion chamber is provided in the sectional heat exchanger. Each of the one or the more than one intermediate segment(s) comprises at least one water flow channel for water to be heated. Between each two consecutive segments at least one flue gas flow channel is provided, extending from the combustion chamber. The one or the more than one intermediate segment(s) each comprise a horizontal row of ribs extending into the flue gas flow channel in order to increase heat exchange from the flue gas to the water to be heated. Ribs at the two outer sides of the horizontal row of ribs have a larger height than ribs in the middle of the row of ribs. With height of the rib is meant the dimension of the rib in the vertical direction of the sectional heat exchanger. The more than one intermediate segment(s) each comprise a plurality of rows of pins extending in the flue gas channel to increase heat transfer.

1 . A sectional heat exchanger for a condensing heat cell,
 wherein the sectional heat exchanger comprises two end segments and one or more than one intermediate segment(s) provided between the two end segments;   wherein the one or the more than one intermediate segment(s) and the two end segments are assembled in the heat exchanger, wherein a combustion chamber is provided in the sectional heat exchanger,   wherein each of the one or the more than one intermediate segment(s) comprises at least one water flow channel for water to be heated,   wherein in between each two consecutive segments at least one flue gas flow channel is provided, and wherein the flue gas flow channel extends from the combustion chamber,   wherein the one or the more than one intermediate segment(s) each comprise a horizontal row of ribs extending into the flue gas flow channel in order to increase heat exchange from the flue gas to the water to be heated;   
       wherein ribs at the two outer sides of the horizontal row of ribs have a larger height than ribs in the middle of the row of ribs; wherein with height of the rib is meant the dimension of the rib in the vertical direction of the sectional heat exchanger; 
       wherein the one or the more than one intermediate segment(s) each comprise a plurality of rows of pins extending in the flue gas channel to increase heat transfer. 
     
     
         2 . A sectional heat exchanger as in  claim 1 , comprising a first section of the water flow channel located below the combustion channel; wherein at least some ribs in the middle of the row of ribs only partially overlap in height direction the height of the first section of the water flow channel located below the combustion chamber. 
     
     
         3 . A sectional heat exchanger as in  claim 1 , wherein the distance between ends in the flue gas channel of ribs of the row of ribs and ends of ribs positioned on the opposing segment is less than 4 mm. 
     
     
         4 . A sectional heat exchanger as in  claim 1 ,
 wherein the row of ribs comprises ribs of a first height and ribs of a second height, wherein the first height is larger than the second height;   and wherein ribs at the outer sides of the horizontal row of ribs are ribs of the first height;   and wherein ribs in the middle of the row of ribs are ribs of the second height.   
     
     
         5 . A sectional heat exchanger as in  claim 1 ,
 wherein the intermediate segment(s) comprise a first horizontal row of pins below the row of ribs, wherein the pins extend into the flue gas flow channel,   wherein this row of pins comprises at its two outer sides pins extending into the flue gas flow channel so that a distance of less than 4 mm is created with pins extending from the opposed segment into the flue gas shaft;   wherein this row of pins comprises in its middle pins extending into the flue gas shaft so that a distance of more than 10 mm is created with pins extending into the flue gas shaft from the opposed segment.   
     
     
         6 . A sectional heat exchanger as in  claim 5 ,
 wherein the intermediate segment(s) comprise a plurality of horizontal rows of pins below the row of ribs, wherein the pins extend into the flue gas flow channel,   wherein each row of pins comprises at its two outer sides pins extending into the flue gas flow channel so that a distance of less than 4 mm is created with pins extending from the opposed segment into the flue gas shaft;   wherein each row of pins comprises in its middle pins extending into the flue gas shaft so that a distance of more than 10 mm is created with pins extending into the flue gas shaft from the opposed segment.   
     
     
         7 . A sectional heat exchanger as in  claim 1 , wherein the combustion chamber has perpendicular to its length axis a cylindrical shape with a circular cross section. 
     
     
         8 . A sectional heat exchanger as in  claim 1 , wherein the water flow channel in the intermediate segment runs over at least 80% of the circumference of the combustion chamber around the combustion chamber. 
     
     
         9 . The sectional heat exchanger as in  claim 1 , wherein the sectional heat exchanger comprises at least two intermediate segments and wherein the at least two intermediate segments are provided parallel to each other in the sectional heat exchanger. 
     
     
         10 . The sectional heat exchanger as in  claim 1 , wherein in the intermediate segment(s), the water flow channel follows a meandering flow path. 
     
     
         11 . The sectional heat exchanger as in  claim 1 , wherein the sectional heat exchanger comprises more than one intermediate segment and wherein water flow channels of the more than one intermediate segment are connected in parallel flow connection. 
     
     
         12 . The sectional heat exchanger as in  claim 1 , wherein the water flow channels in the one or in the more than one intermediate segment(s) are provided for counter flow of the water with respect to the flow direction of the flue gas channels. 
     
     
         13 . A heat cell, comprising
 a sectional heat exchanger as in  claim 1 ; and   a burner,   
       wherein the burner is provided in the combustion chamber for the production of flue gas to flow in parallel through the flue gas channels between the segments of the sectional heat exchanger. 
     
     
         14 . A heat cell as in  claim 13 , wherein the burner extends perpendicularly to the one or to the more than one intermediate segment(s).