Heat exchanger particularly suitable for the construction of high-efficiency so-called condensing type heating boilers

摘要

The heat exchanger for the construction of condensing-type heating boilers, comprises a chamber (1), in the top of which gas or other fuel is burned (4), which is provided with one or more water flow circuits defining a heating stage where the water itself is heated by the heat radiated by the combustion and absorbed by the walls of said chamber (1) and which below this has at least one stage with condensing means for absorbing the residual heat of the combustion fumes before the latter pass out of said chamber, this heat being used to preheat the water before the water enters said heating stage. Said combustion chamber and/or said condensing means contain hollow heat-exchange sections (7, 7', 17) occupying the whole of the plan-view projection of the space through which the heat passes and extending from at least one wall or zone (101) to the opposite wall or zone (201) of the chamber or body that circumscribes this space. These sections are provided with one or more longitudinal channels and are made in any material with good heat-conducting properties and such that the water to be heated and/or preheated can be passed through these channels.