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Harish Satyavada and Simone Baldi
Condensing boilers use waste heat from flue gases to pre-heat cold water entering the boiler. Flue gases are condensed into liquid form, thus recovering their latent heat of vaporization, which results in as much as 10%–12% increase in efficiency. Modeling these heat transfer phenomena is crucial to control this equipment. Despite the many approaches to the condensing boiler modeling, the following shortcomings are still not addressed: thermal dynamics are oversimplified with a nonlinear efficiency curve (which is calculated at steady-state); the dry/wet heat exchange is modeled in a fixed proportion. In this work we cover these shortcomings by developing a novel hybrid dynamic model which avoids the static nonlinear efficiency curve and accounts for a time-varying proportion of dry/wet heat exchange. The procedure for deriving the model is described and the efficiency of the resulting condensing boiler is shown.
black A Novel Modelling Approach for Condensing Boilers Based on Hybrid Dynamical Systems
hybrid modeling; condensing boiler; heat transfer
2016-04-05T15:22:08+08:00
LaTeX with hyperref package
2016-08-12T12:11:36+02:00
2016-08-12T12:11:36+02:00
"hybrid modeling; condensing boiler; heat transfer"
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