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The state of the art of small-scale pellet-based heating systems and relevant regulations in Sweden, Austria and Germany
Dalarna University College, Sweden.
2004 (English)In: Renewable and Sustainable Energy Reviews, ISSN 1364-0321, Vol. 8, no 3, 201-221 p.Article in journal (Refereed) Published
Abstract [en]

The emphasis of this report is on the actual technology of small-scale pellet combustion units and important regulations concerning emissions and pellets. Wood as a heating source has a long tradition in Sweden, but the use of compressed wood pellets in domestic stoves and boilers is rather new. Based on a literature survey, information from manufacturers and test institutes, this report gives an overview about existing technology and investigates how mature it is already. Some comparisons were made to similar heating units in Austria, where this technique is also widely used. It could be seen that the Austrian boilers are more sophisticated including a high level of comfort for the user. On the other hand the simpler Swedish boilers are significantly less expensive, and it is questionable if Swedish costumers are willing to pay for the higher comfort. Relevant regulations concerning emissions and fuel quality are also reported and compared between Sweden, Germany and Austria. In addition some interesting non-official certificates and environmental labels are presented. These give an outlook to future, probably more stringent, regulations.

Place, publisher, year, edition, pages
2004. Vol. 8, no 3, 201-221 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-4037DOI: 10.1016/j.rser.2003.11.002ISI: 000220293000001Scopus ID: 2-s2.0-1342289611OAI: oai:DiVA.org:mdh-4037DiVA: diva2:120575
Available from: 2006-11-27 Created: 2006-11-27 Last updated: 2015-07-08Bibliographically approved
In thesis
1. Combined solar and pellet heating systems: Study of energy use and CO-emissions
Open this publication in new window or tab >>Combined solar and pellet heating systems: Study of energy use and CO-emissions
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In this study 4 solar and pellet heating systems have been studied with the help of annual dynamic simulations. Two of the systems comprised a pellet stove and two systems were solar combisystems; one with a store integrated pellet burner, the other with a separate pellet boiler.

The aim was to evaluate their thermal performance and their CO-emissions. The systems have been modelled based on lab measurements of the single system components. The used models allow a detailed study of the dynamic behaviour of the systems.

The stove systems have the least primary energy consumption provided the auxiliary electricity is taken into account with a conversion factor of 100%. If the auxiliary electricity is taken into account with a conversion of 40% and/or the systems are placed in the heated area the combisystems need less or a similar amount of primary energy.

Modulating combustion power reduces the number of starts and stops and for most pellet units this reduces the total CO emissions. The obtained annual CO emissions are higher than the values obtained from the standard test methods. It was shown that the average emissions under realistic annual conditions were greater than the limit values of two Eco-labels.

The system performance can be significantly improved by a proper control of the pellet heater and by sizing the pellet heater according to the size of the peak space heating demand.

Based on these findings from the simulations two prototypes of a combined solar and pellet heating system has been designed, built and tested; one for the lab and one that has been installed in a demonstration house. The system is very compact and is suitable for detached houses with no heating room or little space for a heating room.

Place, publisher, year, edition, pages
Institutionen för Samhällsteknik, 2006. 95 p.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 36
Keyword
Solar heating, pellet heating
National Category
Other Environmental Engineering
Research subject
Energi- och miljöteknik
Identifiers
urn:nbn:se:mdh:diva-167 (URN)91-85485-30-6 (ISBN)
Public defence
2006-12-19, Gamma, Västerås, 09:30
Opponent
Supervisors
Available from: 2006-11-27 Created: 2006-11-27

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CiteExportLink to record
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