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Comparison of carbon monoxide emissions and electricity consumption of modulating and non-modulating pellet heating systems
Mälardalen University, Department of Public Technology.
2007 (English)In: International Journal of Energy Research, ISSN 0363-907X, Vol. 31, no 10, 915-930 p.Article in journal (Refereed) Published
Abstract [en]

Emission and electricity consumption are important aspects of a pellet heating system. Low noxious emissions, particularly carbon monoxide, are a measure of a well-performing system. High carbon monoxide emissions are often caused by unnecessary cycling of the burner, poor adjustment of the combustion air and insufficient maintenance. The carbon monoxide output, the thermal performance and the electricityconsumption for modulating and non-modulating operation mode have been investigated by simulations of four stoves/boilers as part of combined solar and pellet heating systems. The systems have been modelled with the simulation programme TRNSYS and simulated with the boundary conditions for space heating demand, hot water load and climate data as used in earlier research projects. The results from the simulations show that operating the pellet units with modulating combustion power reduces the number of starts and stops but does not necessarily reduce the carbonmonoxide output. Whether the carbon monoxide output can be reduced or not depends very strongly on the reduction of starts and stops and how much the carbon monoxide emissions increase with decreased combustion power, which are in turn dependent on the particular settings of eachpellet burner and how the heat is transferred to the building. However, for most systems the modulating operation mode has a positive impact oncarbon monoxide emissions. Considering the total auxiliary energy demand, including the electricity demand of the pellet units, the modulatingcombustion control is advantageous for systems 1 and 4 for the used boundary conditions. The study also shows that an appropriate sizing of the stove or boiler has a huge potential for energy saving and carbon monoxide emission reduction.

Place, publisher, year, edition, pages
2007. Vol. 31, no 10, 915-930 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-4039DOI: 10.1002/er.1277OAI: oai:DiVA.org:mdh-4039DiVA: diva2:120577
Available from: 2006-11-27 Created: 2006-11-27 Last updated: 2016-02-16Bibliographically 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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