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Energies 2012, 5(5), 1470-1489; doi:10.3390/en5051470

Efficiency of Small Scale Manually Fed Boilers —Mathematical Models

1,* , 2
1 Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, Novi Sad 21000, Serbia 2 Faculty for Economics and Engineering Management, University Business Academy, Cvecarska 2, Novi Sad 21000, Serbia
* Author to whom correspondence should be addressed.
Received: 27 February 2012 / Revised: 17 April 2012 / Accepted: 3 May 2012 / Published: 15 May 2012
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This study reviews test results for a biomass-fired hot water boiler with a nominal boiler thermal power of 120 kW. In the experiments, prismatic wheat straw bales were used as biomass. The impact of the quantity (220, 290, 360 and 430 m3 h−1) of inlet air fed to the boiler firebox was continuously monitored. This was to examine the influence of the quantity of inlet air and recirculation (0, 16.5 and 33%) of combustion products on the boiler thermal power and boiler energy efficiency. Thus, the following mathematical models and formulas were presented: correlation between boiler thermal power and bale residence time; bale mass loss during the combustion process; correlation between boiler energy efficiency and bale residence time. Mathematical models were obtained by using experimental data and by applying nonlinear regression analysis. Adjustment evaluation of mathematical models with experimental data was performed based on the determination coefficient, t-test and F-test. Increase the amount of air throughout the firebox produced boiler thermal power increase and bale residence time decrease. It was shown that combustion products recirculation of 16.5% partly improved boiler characteristics, while the recirculation of 33% did not, comparing with the case without recirculation.
Keywords: energy efficiency; mathematical models; non-linear regression; recirculation; wheat straw combustion energy efficiency; mathematical models; non-linear regression; recirculation; wheat straw combustion
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Dedovic, N.; Igic, S.; Janic, T.; Matic-Kekic, S.; Ponjican, O.; Tomic, M.; Savin, L. Efficiency of Small Scale Manually Fed Boilers —Mathematical Models. Energies 2012, 5, 1470-1489.

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