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Modelling of dynamics and stratification effects in pellet boilers

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  • Persson, Tomas
  • Wiertzema, Holger
  • Win, Kaung Myat
  • Bales, Chris

Abstract

Optimizing solar and pellet heating systems can be performed by system simulations in TRNSYS. However; this requires detailed boiler models that can properly model the thermal behaviour of the boilers, such as stratification and thermal response. This study uses a combination of existing models for modelling of the pellet burner part (TRNSYS Type 210) and the water volume (TRNSYS Type 340). This approach addresses the thermal dynamics and internal stratification more accurately than other available models. The objectives of this work are to develop a method for parameter identification for the model and to validate this method and the model itself. Sets of parameters are identified for two pellet boilers and one pellet stove with a water jacket (extended room heater) and the model is validated with a realistic dynamic operation sequence. The results show that modelling of stratification is essential in order to model the true behaviour of residential boilers. The test sequences used were adequate to parameterise the models and to provide the desired accuracy, except regarding the heat losses to room air. The model shows good accuracy for a stove and one boiler, but slightly worse performance for the other boiler regarding dynamics and modelling of the stratification.

Suggested Citation

  • Persson, Tomas & Wiertzema, Holger & Win, Kaung Myat & Bales, Chris, 2019. "Modelling of dynamics and stratification effects in pellet boilers," Renewable Energy, Elsevier, vol. 134(C), pages 769-782.
    • Handle: RePEc:eee:renene:v:134:y:2019:i:c:p:769-782
    DOI: 10.1016/j.renene.2018.11.052
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    References listed on IDEAS

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    1. Verma, V.K. & Bram, S. & Vandendael, I. & Laha, P. & Hubin, A. & De Ruyck, J., 2011. "Residential pellet boilers in Belgium: Standard laboratory and real life performance with respect to European standard and quality labels," Applied Energy, Elsevier, vol. 88(8), pages 2628-2634, August.
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    3. Chasapis, D. & Drosou, V. & Papamechael, I. & Aidonis, A. & Blanchard, R., 2008. "Monitoring and operational results of a hybrid solar-biomass heating system," Renewable Energy, Elsevier, vol. 33(8), pages 1759-1767.
    4. Žandeckis, Aivars & Timma, Lelde & Blumberga, Dagnija & Rochas, Claudio & Rošā, Marika, 2013. "Solar and pellet combisystem for apartment buildings: Heat losses and efficiency improvements of the pellet boiler," Applied Energy, Elsevier, vol. 101(C), pages 244-252.
    5. Fiedler, Frank & Nordlander, Svante & Persson, Tomas & Bales, Chris, 2006. "Thermal performance of combined solar and pellet heating systems," Renewable Energy, Elsevier, vol. 31(1), pages 73-88.
    6. Persson, Tomas & Fiedler, Frank & Nordlander, Svante & Bales, Chris & Paavilainen, Janne, 2009. "Validation of a dynamic model for wood pellet boilers and stoves," Applied Energy, Elsevier, vol. 86(5), pages 645-656, May.
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