Heat exchanger of upward combustion type condensing boiler

Abstract

A heat exchanger of an upward combustion condensing boiler maximizes latent-heat recovery efficiency by causing the flow direction of exhaust gas to coincide with the flow direction of condensed water in a latent heat exchange unit. The heat exchanger includes a sensible heat exchange unit that absorbs sensible heat generated from an upward combustion burner; a latent heat exchange unit that absorbs latent heat of vapor included in exhaust gas which has been heat-exchanged in the sensible heat exchange unit; and a condensed-water tray that discharges condensed water generated from the latent heat exchange unit. An upward flow of exhaust gas passed through the sensible heat exchange unit is converted into a downward flow that passes through the latent heat exchange unit, and the latent heat exchange unit is installed so that the flow direction of the exhaust gas passing through the latent heat exchange unit vertically coincides with the falling direction of condensed water generated by the latent heat exchange unit.

1 . A heat exchanger of an upward combustion condensing boiler, comprising:
 a sensible heat exchange unit that absorbs sensible heat generated from an upward combustion burner;   a latent heat exchange unit that absorbs latent heat of vapor included in an exhaust gas which has been heat-exchanged in the sensible heat exchange unit; and   a condensed-water tray that discharges condensed water generated from the latent heat exchange unit, wherein
 an upward flow of exhaust gas passed through the sensible heat exchange unit is converted into a downward flow to pass through the latent heat exchange unit, and 
 the latent heat exchange unit is installed so that flow direction of the exhaust gas passing through the latent heat exchange unit vertically coincides with direction of falling of condensed water generated by the latent heat exchange unit. 
   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the latent heat exchange unit includes
 a box-shaped body having top and bottom surfaces that are open and side surfaces that are closed, and   a plurality of heat exchange tubes which are installed inside the body and spaced a predetermined distance from each other in a horizontal direction.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein the sensible heat exchange unit and the latent heat exchange unit, respectively, include fin-tube heat exchange tubes, each of the fin heat exchange tubes including a tube coupled to heat transfer fins. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein height of an upper end portion of the condensed-water tray is at least equal to height of an exhaust-flue entrance portion through which exhaust gas is discharged. 
     
     
         5 . The heat exchanger according to  claim 2 , wherein height of an upper end portion of the condensed-water tray is at least equal to height of an exhaust-flue entrance portion through which exhaust gas is discharged.