Increasing efficiency and decreasing CO-emissions for a combined solar and wood pellet heating system for single-family houses
2006 (English)In: Proc. on USB of Pellets 2006, 30 May - 1 June, Jönköping, Sweden, 2006, 89-71 p.Conference paper (Refereed)
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.
Place, publisher, year, edition, pages
2006. 89-71 p.
Boilers, efficiency, emissions, emission reduction
IdentifiersURN: urn:nbn:se:kth:diva-6490OAI: oai:DiVA.org:kth-6490DiVA: diva2:11217
QC 201009162006-12-042006-12-042010-09-16Bibliographically approved