Boiler

Abstract

A boiler (1) comprising a combustion chamber (3) associated with a gas burner (4); a primary heat exchanger (5) for transferring the heat of smoke in the combustion chamber (3) to a heating fluid; a fan (7) for circulating the smoke; and a secondary heat exchanger (8) for recovering latent condensation heat from the smoke; the secondary heat exchanger (8) includes a A tube (23) of a spiral conduit (24) in which a heating fluid is circulated; a shell (25) having a substantially cylindrical cavity (26) capable of housing the tube (23) and in which smoke flows through the tube (23) ) outside.

Description

technical field [0001] The present invention relates to a boiler, and more particularly to a wall-mounted gas-fired boiler having a suction burner, a primary heat exchanger, a secondary condensing heat exchanger, and interposed between two heating Fan between switches. Background technique [0002] In heating boilers, especially of the wall-mounted gas type, so-called condensing boilers are known which comprise a combustion chamber associated with an air / gas premix burner; for directing the air-gas mixture to the burner A fan; and a heat exchanger, which, in addition to transferring the heat of the smoke to the heating fluid (water), also includes a condensation part for recovering the potential condensation heat from the smoke. [0003] From European patent application EP-A-0945688 is known a boiler comprising two separate heat exchangers connected in series along the smoke path: a primary heat exchanger for transferring heat from the smoke to a heating fluid, and a A sec...

AI Technical Summary

Problems solved by technology

[0004] Although the above known boilers offer a fairly high degree of efficiency, there is still room for further improvement in terms of efficiency and most importantly design complexity

In fact, the heat exchangers currently used in the aforementioned applications are rather complex and heavy, so this also applies to the associated boilers

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