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International Journal of Thermophysics

, Volume 31, Issue 4–5, pp 665–679 | Cite as

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

  • P. SchleyEmail author
  • M. Beck
  • M. Uhrig
  • S. M. Sarge
  • J. Rauch
  • F. Haloua
  • J.-R. Filtz
  • B. Hay
  • M. Yakoubi
  • J. Escande
  • A. Benito
  • P. L. Cremonesi
Article

Abstract

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).

Keywords

GERG Methane Natural gas Reference calorimeter Superior calorific value 

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References

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • P. Schley
    • 1
    Email author
  • M. Beck
    • 1
  • M. Uhrig
    • 1
  • S. M. Sarge
    • 2
  • J. Rauch
    • 2
  • F. Haloua
    • 3
  • J.-R. Filtz
    • 3
  • B. Hay
    • 3
  • M. Yakoubi
    • 4
  • J. Escande
    • 4
  • A. Benito
    • 5
  • P. L. Cremonesi
    • 6
  1. 1.E.ON Ruhrgas AGEssenGermany
  2. 2.Physikalisch-Technische BundesanstaltBraunschweigGermany
  3. 3.Laboratoire National de Métrologie et D’essaisTrappesFrance
  4. 4.GDF SuezParisFrance
  5. 5.EnagásMadridSpain
  6. 6.Snam Rete GasSan Donato MilaneseItaly

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