Measurements of the Calorific Value of Methane with the New GERG Reference Calorimeter

Autor: J. Escande, M. Yakoubi, A. Benito, Stefan M. Sarge, Jean-Remy Filtz, P. L. Cremonesi, Bruno Hay, J. Rauch, M. Uhrig, P. Schley, M. Beck, F. Haloua
Rok vydání: 2010
Předmět:
Zdroj: International Journal of Thermophysics. 31:665-679
ISSN: 1572-9567
0195-928X
DOI: 10.1007/s10765-010-0714-z
Popis: A new reference calorimeter has been developed under a European research project and set-up by Physikalisch-Technische Bundesanstalt (PTB) in Germany. The objective of the project is to measure the superior calorific value (SCV) of methane and other pure gases with a measurement uncertainty of less than 0.05 %. This paper presents the measurement results obtained for methane. Nine repeatability measurements were made. The molar SCV obtained when the measurements were averaged is 890.578 kJ·mol−1. This value agrees very accurately with the value of 890.63 kJ·mol−1 specified by ISO 6976 [Natural Gas—Calculation of Calorific Values, Density, Relative Density and Wobbe Index from Composition. International Standard ISO 6976, corrected and reprinted 1996-02-01]. Twice the standard deviation determined for the measurements is 0.023 % and is thus clearly lower than in previous experiments. Two independent uncertainty analyses confirm that the envisaged total uncertainty of 0.05 % is achieved (95 % confidence level).
Databáze: OpenAIRE
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