Thermal performance of combined solar and pellet heating systems

Document identifier: oai:dalea.du.se:1045
Access full text here:10.1016/j.renene.2005.03.007
Keyword: Engineering and Technology, Civil Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Pellet heating systems; heat losses; flue gas losses; leakage losses
Publication year: 2006
Relevant Sustainable Development Goals (SDGs):
SDG 7 Affordable and clean energySDG 11 Sustainable cities and communities
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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 1 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 optimization exists for all studied systems, which when applied could alter the relative merits of the different system types.

Authors

Frank Fiedler

Högskolan Dalarna; Miljöteknik
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Svante Nordlander

Högskolan Dalarna; Miljöteknik
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Tomas Persson

Högskolan Dalarna; Miljöteknik
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Chris Bales

Högskolan Dalarna; Miljöteknik
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