Validation of a dynamic model for wood pellet boilers and stoves

Persson, Tomas; Fiedler, F.; Nordlander, Svante; Bales, Chris; Paavilainen, Janne

doi:10.1016/j.apenergy.2008.07.004

Cited by 45 publications

(30 citation statements)

References 9 publications

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“…Wood stoves, as many other heating systems, need to operate with long production cycles in order to reach their best performance, in terms of energy efficiency as well as emissions of pollutants. In the measurements of Persson et al [4], a start-up time of 0.6 h is reported before the tested pellet stoves deliver their P c,n . The wood-log combustion should rather be considered as a batch process where each batch has a length of ∼45 min or more.…”

Section: Research Context and Questionsmentioning

confidence: 99%

“…The dynamics of pellets combustion is faster than the stove and the building characteristic time scales so that the combustion process in pellet stoves can be assumed instantaneous [4]. The P c is here modulated using a PID If the P c can be modulated continuously from 0 to P c,n , the PID controller is able to track the T set and the stove operates continuously to counterbalance the envelope losses (see Scenario 1 in Figure 3).…”

Section: Pellet Stove Modelmentioning

confidence: 99%

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On the proper integration of wood stoves in passive houses: Investigation using detailed dynamic simulations

Georges

Skreiberg

Novaković

2013

Energy and Buildings

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Wood stoves are attractive for the space-heating (SH) of passive houses. Nevertheless, there are still questions about their integration. Firstly, the power oversizing of the current stoves and their long operating time may lead to unacceptable overheating. Secondly, it is also unclear how one stove can ensure the thermal comfort in the entire building. The paper investigates these aspects using detailed dynamic simulations (TRNSYS) applied to a detached house in Belgium. An 8 kW stove is assumed to be representative of the lowest available powers in the market. Results confirm that a large power modulation is important to prevent overheating. Opening the internal doors, a high building thermal mass and a heat emission dominated by radiation also reduce the overheating risk, but to a smaller extent. Besides, a single stove cannot enforce the thermal comfort during design weather conditions: * Corresponding author

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Section: Research Context and Questionsmentioning

confidence: 99%

Section: Pellet Stove Modelmentioning

confidence: 99%

On the proper integration of wood stoves in passive houses: Investigation using detailed dynamic simulations

Georges

Skreiberg

Novaković

2013

Energy and Buildings

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“…Most recent research has focused on particulate matter emission and pellets stove performance (Wiinikka and Gebart 2004, Persson et al 2008, Johansson et al 2003, Eskilson et al 2004, Soto and Núñez 2008. However, compact feed systems development, as well as grates and combustion chambers improvement, continue to represent a challenge for the wider use of low-cost wood chips.…”

Section: Introduction Wood Chips As Fuel For Small Furnacesmentioning

confidence: 99%

Design and efficiency of a small-scale woodchip furnace

Torres-Fuchslocher

Varas-Concha

2015

Maderas, Cienc. tecnol.

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Although advances have been made in combustion efficiency in large-scale woodchip furnaces, less experimental results are available at the <20 kW range. Compact feed systems, as well as optimized grates and combustor chambers, continue to represent a challenge for the wider use of low-cost wood chips. This study describes the design and testing of a small-scale woodchip furnace that operates at a range of 9-18 kW. The efficiency test takes account of the feedstock Eucalyptus nitens, with three moisture contents and the combination of different air excess (λ) and primary/secondary air ratios. The results reveal a maximum of combustion efficiency of 85% for the low moisture content sample (16%) at λ=1,5 and 82% for samples with 29% and 40% moisture content, at λ= 2,0 and 2,1 respectively. The integrated heat exchanger proved to be highly efficient by reducing gas temperature by up to 69% prior to its exit.

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“…The combustion process in pellet stoves can be assumed instantaneous [14] compared the characteristic time scales of either the stove or the building envelopes. The power is here controlled continuously by a Proportional Integral (PI) action to enforce the zone air temperature (T s ) to T set .…”

Section: Stove Model and Parametersmentioning

confidence: 99%

“…Current wood stoves have a minimal nominal power, P c,n 1 , of about 8 kW while the nominal power of the losses in passive houses during design conditions is much lower (roughly 3 kW for Oslo): current stoves are thus much oversized compared to the instantaneous envelope needs. Furthermore, wood stoves are characterized with rather long combustion cycles, typically more than 45 min for a log stove [13], while a pellet stove typically has a 30 min start-up period [14]. These long cycles should be promoted in order to get the best energy efficiency and to reduce the emission of pollutants that are dominant during the start and stop phases.…”

Section: Introductionmentioning

confidence: 99%

On the proper integration of wood stoves in passive houses under cold climates

Georges

Skreiberg

Novaković

2014

Energy and Buildings

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The space-heating (SH) of residential buildings using a wood stove is an attractive solution. The way to properly integrate stoves in passive houses (PH) is still in question: current nominal powers are generally oversized compared to the PH needs (i.e. overheating risk) and it is not well understood how one stove can contribute to the SH of the entire building during a heating season. This question has already been addressed for the temperate climate of Belgium in a previous paper. The present work investigates cold climates also using a larger range of stove parameters. This is done using detailed dynamic simulations (TRNSYS) on a typical Norwegian single-family house typology.Using a large sensitivity analysis, recommendations to prevent overheating are given with a distinction between pellet and log stoves. Results also show that the overheating risk is somehow comparable between cold climates. On * Corresponding author

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Validation of a dynamic model for wood pellet boilers and stoves

Cited by 45 publications

References 9 publications

On the proper integration of wood stoves in passive houses: Investigation using detailed dynamic simulations

On the proper integration of wood stoves in passive houses: Investigation using detailed dynamic simulations

Design and efficiency of a small-scale woodchip furnace

On the proper integration of wood stoves in passive houses under cold climates

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