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A Novel Modelling Approach for Condensing Boilers Based on Hybrid Dynamical Systems

by Harish Satyavada *,† and Simone Baldi
Delft Center for Systems and Control, Delft University of Technology, Mekelweg 2, Delft 2628CD, The Netherlands
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: David Mba
Machines 2016, 4(2), 10;
Received: 31 December 2015 / Revised: 3 March 2016 / Accepted: 25 March 2016 / Published: 5 April 2016
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. View Full-Text
Keywords: hybrid modeling; condensing boiler; heat transfer hybrid modeling; condensing boiler; heat transfer
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Satyavada, H.; Baldi, S. A Novel Modelling Approach for Condensing Boilers Based on Hybrid Dynamical Systems. Machines 2016, 4, 10.

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