Solar and pellet combisystem for apartment buildings: Heat losses and efficiency improvements of the pellet boiler

摘要: Abstract This paper is based on the analysis of solar combisystem installed in a 4-storey apartment building Sigulda, Latvia. The consists of: 42 m2 flat plate collectors, 2.35 m3 accumulation tank and 100 kW pellet boiler as auxiliary heater. focuses optimisation thermal performance boiler. During laboratory tests 25 kW boiler, influence supply ratio combustion air, chemical heat losses flue gases was established. results demonstrate optimum performance, CO emissions, losses, which are related to amount free oxygen (O2) gases. were then applied optimise operation gas measurements for performed order identify O2 concentration, emissions temperature. showed that what required reduce air supplied boiler’s chamber. Changes made control algorithms achieve desired result. Additionally, improved by changing location intake point. Decreasing temperatures achieved making modifications algorithms.