Increasing efficiency and decreasing CO-emissions for a combined solar and wood pellet heating system for single-family houses

Document identifier: oai:dalea.du.se:2106
Keyword: Engineering and Technology, Other Engineering and Technologies, Other Engineering and Technologies not elsewhere specified, Teknik och teknologier, Annan teknik, Övrig annan teknik, Boilers, Efficiency, Emissions, Emission reduction
Publication year: 2006
Relevant Sustainable Development Goals (SDGs):
SDG 11 Sustainable cities and communitiesSDG 7 Affordable and clean energySDG 13 Climate action
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

This study focus on how wood pellets and solar heating systems for single-family houses should be designed and controlled to reach high efficiency and to reduce the CO-emissions. A recently developed TRNSYS model was used to simulate the wood pellet boiler. Parameters for the model were identified from laboratory measurements on a boiler. A detailed simulation model of a complete solar combisystem was created and annual simulations were performed. Assuming that all heat losses to the room are waist heat, the results show that the most important factors to achieve high system efficiency are that the boiler and the buffer store should be well insulated. The sensor controlling the boiler should be placed in the store; the pump between the boiler and the store should only be in operation together with the burner and for some time after the burner have stopped to take care of the after burning heat. For boilers with relatively large start and stop CO-emissions modulating power may be an efficient measure to reduce CO-emissions. Especially for boilers using an ON-OFF control, the dominating contribution of CO-emissions may be during the start and stop phases, thus reducing emissions during operation may have little influence on the annual CO-emissions.

Authors

Tomas Persson

Högskolan Dalarna; Miljöteknik
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Frank Fiedler

Högskolan Dalarna; Miljöteknik
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Mats Rönnelid

Högskolan Dalarna; Miljöteknik
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Chris Bales

Högskolan Dalarna; Miljöteknik
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