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Thermal performance of combined solar and pellet heating systems
Dalarna University College, Sweden.
Dalarna University College, Sweden.
Dalarna University College, Sweden.
Dalarna University College, Sweden.
2006 (English)In: Renewable Energy, ISSN 0960-1481, Vol. 31, no 1, 73-88 p.Article in journal (Refereed) Published
Abstract [en]

Various pellet heating systems are marketed in Sweden, some of them in combination with a solar heating system. Several types of pellet heating units are available and can be used for a combined system. This article compares four typical combined solar and pellet heating systems. System 1 and 2 with a pellet stove, system 3 with a store integrated pellet burner and system 4 with a pellet boiler. The often lower efficiency of pellet heaters compared to oil or gas heaters increases the final energy demand. Consequently, heat losses of the various systems have been studied. The systems have been modeled in TRNSYS and simulated with parameters identified from measurements. For almost all systems the flue gas losses are the main heat losses except for system 3 where store heat losses prevail. Relevant are also the heat losses of the burner and the boiler to the ambient. Significant leakage losses are noticed for system 3 and 4. For buildings with an open internal design system I is the most efficient solution. Other buildings should preferably apply system 2 or 3. The right choice of the system depends also on whether the heater is placed inside or outside of the heated area. Unlike the expectations and results from other studies, the operation of the pellet heaters with modulating combustion power is not necessarily improving the performance. A large potential for system optimisation exists for all studied systems, which when applied could alter the relative merits of the different system types.

Place, publisher, year, edition, pages
2006. Vol. 31, no 1, 73-88 p.
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:mdh:diva-4038DOI: 10.1016/j.renene.2005.03.007ISI: 000232741200006Scopus ID: 2-s2.0-24644466020OAI: oai:DiVA.org:mdh-4038DiVA: diva2:120576
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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Citation style
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