Title:
Influence of Leak Tightness and Heat Storage Capacity of Biomass Room Heating Appliances on Thermal Efficiency
Author(s):
Sturmlechner, R., Reichert, G., Stressler, H., Aigenbauer, S., Schmidl, C., Schwabl, M., Haslinger, W.
Document(s):
Paper
Poster
Abstract:
Small scale biomass room heating appliances are widespread in Europe. For lower fuel demand, fuel cost reduction as well as in terms of emission reduction a high thermal efficiency of a stove is preferable. Current standard type testing methods determine thermal efficiency in an indirect way, not respecting thermal flue gas losses in the cooling down phase. However, thermal flue gas losses during cooling down are mainly produced by the untightness combined with the heat storage capacity of a stove. Hence, two tests with each of two room heating appliances with different properties regarding leak tightness and heat storage capacity were conducted in a calorimeter room. A heating cycle including cooling down phase was assessed for every stove in order to directly determine thermal efficiency and thermal heat losses at different technologies. Results show that the leakage rate, but also heat storage capacity have a major influence of thermal heat losses in the flue gas after the heating cycle of a firewood room heating appliance. These flue gas losses are the main reason for differences between the direct and indirect thermal efficiency determination approach. Hence, it is necessary to respect stoves properties concerning leak tightness and heat storage capacity when determining its efficiency indirectly.
Keywords:
bioenergy, thermal efficiency, losses, firewood stove
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Biomass and bioliquids combustion for small and medium scale applications
Event:
24th European Biomass Conference and Exhibition
Session:
2BV.1.12
Pages:
651 - 653
ISBN:
978-88-89407-165
Paper DOI:
10.5071/24thEUBCE2016-2BV.1.12
Price:
FREE
