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Optimisation method for solar heating systems in combination with pellet boilers/stove
Mälardalen University, Department of Public Technology. Dalarna University College, Sweden.
Dalarna University College, Sweden.
Dalarna University College, Sweden.
2007 (English)In: International Journal of Green Energy, ISSN 1543-5075, Vol. 4, no 3, 325-337 p.Article in journal (Refereed) Published
Abstract [en]

n this study, an optimisation method for the design of combined solar and pellet heating systems is presented and evaluated. The paper describes the steps of the method by applying it to an example system. The objective of the optimisation was to find the design parameters that give the lowest auxiliary energy (pellet fuel + auxiliary electricity) and carbon monoxide (CO) emissions for a system with a typical load: a single family house in Sweden. Weighting factors have been used for the auxiliary energy use and CO emissions to give a combined objective function. Different weighting factors were tested. The results show that extreme weighting factors lead to their own minima. However, it was possible to find factors that ensure low values for both auxiliary energy and CO emissions, and suitable weighting factors are suggested.

Place, publisher, year, edition, pages
2007. Vol. 4, no 3, 325-337 p.
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:mdh:diva-4040DOI: 10.1080/15435070701332153ISI: 000247347500006Scopus ID: 2-s2.0-34548550833OAI: oai:DiVA.org:mdh-4040DiVA: diva2:120578
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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Cite
Citation style
  • apa
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  • Other style
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Language
  • de-DE
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Output format
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