Natural gas. Calculation of thermodynamic properties. Part 2: Single-phase properties (gas, liquid, and dense fluid) for extended ranges of application (ISO 20765-2:2015)
Tuote ladattavissa hetiToimitusaika on noin 1 - 2 työpäivääToimitusaika on 3 - 5 työpäivää.
ISO 20765-2:2015 specifies a method to calculate volumetric and caloric properties of natural gases, manufactured fuel gases, and similar mixtures, at conditions where the mixture may be in either the homogeneous (single-phase) gas state, the homogeneous liquid state, or the homogeneous supercritical (dense-fluid) state.
Tämän julkaisun valmistelusta Suomessa vastaa SFS Suomen Standardit, puh. 09 149 9331.
Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Thermodynamic basis of the method
4.1 Principle
4.2 The fundamental equation based on the Helmholtz free energy
4.3 Thermodynamic properties derived from the Helmholtz free energy
5 Method of calculation
5.1 Input variables
5.2 Conversion from pressure to reduced density
5.3 Implementation
6 Ranges of application
6.1 Pure gases
6.2 Binary mixtures
6.3 Natural gases
7 Uncertainty of the equation of state
7.1 Background
7.2 Uncertainty for pure gases
7.3 Uncertainty for binary mixtures
7.4 Uncertainty for natural gases
7.5 Uncertainties in other properties
7.6 Impact of uncertainties of input variables
8 Reporting of results
Annex A Symbols and units (normative)
Annex B The reduced Helmholtz free energy of the ideal gas (normative)
Annex C Values of critical parameters and molar masses of the pure components (normative)
Annex D The residual part of the reduced Helmholtz free energy (normative)
Annex E The reducing functions for density and temperature (normative)
Annex F Assignment of trace components (informative)
ISO 14532:2014 Natural gas -- Vocabulary
ISO 20765-1:2005 Natural gas -- Calculation of thermodynamic properties -- Part 1: Gas phase properties for transmission and distribution applications
ISO 7504:2015 Gas analysis -- Vocabulary
ISO 14532:2014 Natural gas -- Vocabulary
ISO 20765-1:2005 Natural gas -- Calculation of thermodynamic properties -- Part 1: Gas phase properties for transmission and distribution applications
ISO 7504:2015 Gas analysis -- Vocabulary
ISO 80000-5:2007 Quantities and units -- Part 5: Thermodynamics