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Proficiency test SYKE 6/2013 - Gross and net calorific value in fuels
ISBN (pdf):978-952-11-4257-4 
Julkaistu:2014 
Julkaisusarja ja numero:Reports of the Finnish Environment Institute 2/2014 
Kieli:englanti 
Kustantaja:Finnish Environment Institute 
Saatavuus (pdf):http://hdl.handle.net/10138/42715 
Sivumäärä:73 
Tekijät:Mirja Leivuori; Minna Rantanen; Katarina Björklöf; Keijo Tervonen; Sari Lanteri; Markku Ilmakunnas  

48.00 €

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 2013. One peat sample, one wood pellet and one coal sample were delivered to the laboratories. In total, 45 laboratories participated in the proficiency test. Additionally, the participants were asked to estimate/calculate the emission factor for the peat and coal samples. Basically, 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 total 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 in the samples and nitrogen for peat and wood pellet samples and emission factor for peat sample. In total, 87 % of the participating laboratories reported the satisfactory results when the deviations of 1–30 % from the assigned values were accepted. About 70 % of the participants used accredited methods and 85 % of their results were satisfactory. In measurement of the gross calorific value from the peat sample 88 %, from the wood pellet sample 72 % and from the coal sample 85 % of the results were satisfactory. In measurement of the net calorific value from the peat sample 100 %, from the wood pellet 79 % and from the coal sample 87 % of the results were satisfactory.


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