|ISBN (pdf):||978-952-11-4410-3|| |
|Julkaisusarja ja numero:||Reports of the Finnish Environment Institute 1/2015|| |
|Kustantaja:||Finnish Environment Institute|| |
|Saatavuus (pdf):||http://hdl.handle.net/10138/153188|| |
|Tekijät:||Mirja Leivuori; Minna Rantanen; Katarina Björklöf; Keijo Tervonen; Sari Lanteri; Markku Ilmakunnas
Proftest SYKE arranged proficiency test for measurement the gross and the net calorific value, the content of ash, carbon, nitrogen, hydrogen, moisture, sulphur and volatile matter in fuels in September 2014. One peat, one wood pellet and one coal sample were delivered to the participants. In total, there weres 25 participants in the proficiency test. Additionally, the participants were asked to estimate/calculate the emission factor for the peat and coal samples. In total, 86 % of the participating laboratories reported the satisfactory results when the deviations of 1–30 % from the assigned values were accepted. About 80 % of the participants used accredited methods and 93 % of their results were satisfactory. In measurement of the gross calorific value from the peat sample 78 %, from the wood pellet sample 78 % and from the coal sample 88 % of the results were satisfactory. In measurement of the net calorific value from the peat sample 86 %, from the wood pellet 79 % and from the coal sample 80 % of the results were satisfactory. The robust means or mean of the reported results by the participants were used as the assigned values for measurements. The evaluation of performance was based on the z score which was calculated using the assigned value and the standard deviation for proficiency assessment at 95 % confidence level. The standard deviation for performance assessment was mainly set on the basis of the reproducibility requirements presented the standard methods. The evaluation of performance was not done for the measurement of moisture and emission factor in all samples and of nitrogen for wood pellet samples.