Parametrical Functioning Study for a Small Boiler Condensing Unit

Considering the actual concern for reducing the fuel consumption along with pollution reduction, the condensing boilers get a major importance for the manufacturers, mainly for the household heating domain. In the context, more and more small boilers producers shift their non-condensing units to condensing units. Because of economical constraints linked to manufacturing costs it is of outmost importance for the producers to study a range of constructive solutions in the design stage. We elaborated a physical model for finned tubes small boilers that we implemented in a computational program. The aim was to generate alternative solutions for the basic design, in order to be able to perform an economical optimization. In the present paper we present an example of such computational modeling and optimization study for a finned tubes aqua-tubular boiler. The computational model gives solid information not only for the general functioning of the boiler, but also gives detailed information about the thermal and physical processes that occur on each individual heat and mass transfer surface along the flue gas flow, permitting an even deeper phenomenological analyze with significant results for the boiler constructive and functional optimization.