Title:
Development of a New Test Method of Defining a Real Life Thermal Heat Output of Firewood Stoves
Author(s):
Sturmlechner, R., Reichert, G., Aigenbauer, S., Stressler, H., Moser, W., Schmidl, C., Schwabl, M., Haslinger, W.
Document(s):
Paper
Poster
Abstract:
The market for firewood stoves with low thermal heat output is increasing due to new technologies for heat provision in buildings of low heating demands. However, definition of thermal heat output according to the current standard type testing method (EN 13240) does not sufficiently respect real life combustion conditions, for instance the cold conditions at beginning of heating operation as well as the heat storage capacity of the stove. Within the project “Ofenprüfung 2020” (coordinated by BIOENERGY 2020+ GmbH) a new testing method was developed in order to reflect real life conditions. Thereby a method for a Real Life Thermal Heat Output Range was defined, which includes a maximum, mean and minimum thermal heat output. In the present study the objective is to evaluate this approach and consequently to define the most appropriate method for testing a Real Life Thermal Heat Output. Hence, the net heat energy release of a stove was measured using a calorimeter room. Then the approach of Real Life Thermal Heat Output Range was applied. The results show that for the particular stove tested 60 % of the produced heat is still dissipated after the last batch in the cooling down phase. Therefore, especially the mean and minimum thermal heat output would be appropriate values for estimating the Real Life Thermal Heat Output. The maximum thermal heat output does not respect the cooling down phase and therefore overestimates the overall performance of the stove. The minimum thermal heat output was found to be 60.2 % lower than the maximum thermal heat output in average. User behavior surveys of “Ofenprüfung 2020” showed that in most cases only three batches are conducted. Hence, the minimum THO is most suitable for reflecting real life operations. Finally, the new approach seems to be a valid method for defining a Real Life Thermal Heat Output since the heat storage capacity of a stove significantly influences the thermal heat release. However, for better evaluation more tests with stoves providing different heat storage capacities have to be done.
Keywords:
bioenergy, heat, performance, stove, standards
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Biomass and bioliquids combustion for small and medium scale applications
Event:
23rd European Biomass Conference and Exhibition
Session:
2BV.2.44
Pages:
732 - 735
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-2BV.2.44
Price:
FREE
