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Optimisation method for solar heating systems in combination with pellet boilers/stove
Mälardalens högskola, Institutionen för samhällsteknik. Dalarna University College, Sweden.
Dalarna University College, Sweden.
Dalarna University College, Sweden.
2007 (Engelska)Ingår i: International Journal of Green Energy, ISSN 1543-5075, E-ISSN 1543-5083, Vol. 4, nr 3, s. 325-337Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2007. Vol. 4, nr 3, s. 325-337
Nationell ämneskategori
Energisystem
Identifikatorer
URN: urn:nbn:se:mdh:diva-4040DOI: 10.1080/15435070701332153ISI: 000247347500006Scopus ID: 2-s2.0-34548550833OAI: oai:DiVA.org:mdh-4040DiVA, id: diva2:120578
Tillgänglig från: 2006-11-27 Skapad: 2006-11-27 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Combined solar and pellet heating systems: Study of energy use and CO-emissions
Öppna denna publikation i ny flik eller fönster >>Combined solar and pellet heating systems: Study of energy use and CO-emissions
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Institutionen för Samhällsteknik, 2006. s. 95
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 36
Nyckelord
Solar heating, pellet heating
Nationell ämneskategori
Annan naturresursteknik
Forskningsämne
Energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-167 (URN)91-85485-30-6 (ISBN)
Disputation
2006-12-19, Gamma, Västerås, 09:30
Opponent
Handledare
Tillgänglig från: 2006-11-27 Skapad: 2006-11-27

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