ASTM D7265-23

Standard Specification for Hydrogen Thermophysical Property Tables

SCOPE
1.1 The thermophysical property tables for normal hydrogen are for use in the calculation of the pressure-volume-temperature (PVT), thermodynamic, and transport properties of hydrogen for process design and operations, particularly as they relate to hydrogen fuel cell applications. Tables are provided for gaseous hydrogen at temperatures between 50 K and 500 K at pressures to 500 MPa. These tables were developed by the National Institute of Standards and Technology from a Standard Reference Database product REFPROP, version 10.02.  
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2023
• ICS: 27.075 - Hydrogen technologies
• Technical Committee: D03 - Gaseous Fuels
• Drafting Committee: D03.08 - Thermophysical Properties

Relations

• Replaces: ASTM D7265-12(2018) - Standard Specification for Hydrogen Thermophysical Property Tables
• Effective Date: 01-Nov-2023
• Referred By: ASTM D7941/D7941M-23 - Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer
• Effective Date: 01-Nov-2023

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7265 − 23
Standard Specification for
1
Hydrogen Thermophysical Property Tables
This standard is issued under the fixed designation D7265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Terminology
1.1 The thermophysical property tables for normal hydro- 4.1 Definitions—For definitions of general terms used in
gen are for use in the calculation of the pressure-volume- D03 Gaseous Fuels standards, refer to Terminology D4150.
temperature (PVT), thermodynamic, and transport properties
5. Tables
of hydrogen for process design and operations, particularly as
they relate to hydrogen fuel cell applications. Tables are 5.1 The tabulated thermophysical properties are:
-1
ρ, molar density (mol·L )
provided for gaseous hydrogen at temperatures between 50 K
-1
and 500 K at pressures to 500 MPa. These tables were V, molar volume (L ·mol)
-1
H, molar enthalpy (J·mol )
developed by the National Institute of Standards and Technol-
-1 -1
ogy from a Standard Reference Database product REFPROP, S, molar entropy (J·K ·mol )
2 -1 -1
C , constant volume molar heat capacity (J·K ·mol )
version 10.0 .
v
-1 -1
C , constant pressure molar heat capacity (J·K ·mol )
p
1.2 This international standard was developed in accor-
-1
c, speed of sound (m·s )
dance with internationally recognized principles on standard-
η, viscosity (μPa·s)
ization established in the Decision on Principles for the
-1 -1
λ, thermal conductivity (mW·m ·K )
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 5.2 These tables were produced by equations from a com-
Barriers to Trade (TBT) Committee. puter package, “NIST Standard Reference Database 23; Ref-
erence Fluid Thermodynamic and Transport Properties Data-
2. Referenced Documents
base (REFPROP): Version 10.0.” A wide selection of units (SI
3
units, engineering units, chemical units) is available with this
2.1 ASTM Standards:
program.
D4150 Terminology Relating to Gaseous Fuels
6. Additional Information
3. Applicability
6.1 The Reference States for enthalpy and entropy have
3.1 These tables apply directly only to pure gaseous hydro-
been updated in this version of the Standard.
gen. However, it is expected that they may find substantial use
in mathematical models and tables for the thermophysical
6.2 Reference state properties are required to calculate
properties of mixtures containing hydrogen.
certain of the thermodynamic properties (enthalpy, entropy,
etc.) from an equation of state formulation.
1
6.3 The reference state properties used to generate the tables
This specification is under the jurisdiction of ASTM Committee D03 on
Gaseous Fuels and is the direct responsibility of Subcommittee D03.08 on
in this specification are: enthalpy, H, and entropy, S, at 298.15
Thermophysical Properties.
K and 0.101325 MPa (H = 10018 J ⁄mol and S = 186.266
Current edition approved Nov. 1, 2023. Published January 2024. Originally
J/(mol K)). The molar mass of hydrogen is 2.0159 g/mol.
approved in 2006. Last previous edition approved in 2018 as D7265 – 12 (2018).
DOI: 10.1520/D7265-23.
6.4 Two new tables have been added at 35 Mpa (350 Bar)
2
Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard
and 70 Mpa (700 Bar). These are the most common fuel
Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-
REFPROP, Version 10.0, National Institute of Standards and Technology, Standard pressures used for vehicles using hydrogen fuel cells.
Reference Data Program, Gaithersburg, 2018.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Keywords
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.1 hydrogen gas tables; thermodynamic properties of hy-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. drogen; transport properties of hydrogen
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7265 − 23
TABLE 1 Hydrogen Thermophysical Property Tables
T ρ V H S C C c λ η
v p
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
(K) (mol·L ) (L ·mol) (J·mol ) (J·mol ·K ) (J·mol ·K ) (J·mol ·K ) (m·s ) (mW·m ·K ) (μPa·s)
0.1 MPa
50 0.242470 4.1243 3641.7 142.90 12.543 21.131 584.75 37.766 2.4059
55 0.219970 4.5461 3747.3 144.91 12.579 21.113 613.42 40.9
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7265 − 12 (Reapproved 2018) D7265 − 23
Standard Specification for
1
Hydrogen Thermophysical Property Tables
This standard is issued under the fixed designation D7265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 The thermophysical property tables for normal hydrogen are for use in the calculation of the pressure-volume-temperature
(PVT), thermodynamic, and transport properties of hydrogen for process design and operations, particularly as they relate to
hydrogen fuel cell applications. Tables are provided for gaseous hydrogen at temperatures between 50 K and 500 K at pressures
to 50500 MPa. These tables were developed by the National Institute of Standards and Technology from a Standard Reference
2
Database product REFPROP, version 9.0.10.0 .
1.2 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D4150 Terminology Relating to Gaseous Fuels
3. Applicability
3.1 These tables apply directly only to pure gaseous hydrogen. However, it is expected that they may find substantial use in
mathematical models and tables for the thermophysical properties of mixtures containing hydrogen.
4. Terminology
4.1 Definitions—For definitions of general terms used in D03 Gaseous Fuels standards, refer to Terminology D4150.
5. Tables
5.1 The tabulated thermophysical properties are:
-1
ρ, molar density (mol·L )
-1
V, molar volume (L ·mol)
-1
H, molar enthalpy (J·mol )
-1 -1
S, molar entropy (J·K ·mol )
1
This specification is under the jurisdiction of ASTM Committee D03 on Gaseous Fuels and is the direct responsibility of Subcommittee D03.08 on Thermophysical
Properties.
Current edition approved April 1, 2018Nov. 1, 2023. Published May 2018January 2024. Originally approved in 2006. Last previous edition approved in 20122018 as
D7265 - 12.D7265 – 12 (2018). DOI: 10.1520/D7265-12R18.10.1520/D7265-23.
2
Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP,
Version 10.0, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, 2018.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7265 − 23
-1 -1
C , constant volume molar heat capacity (J·K ·mol )
v
-1 -1
C , constant pressure molar heat capacity (J·K ·mol )
p
-1
c, speed of sound (m·s )
η, viscosity (μPa·s)
-1 -1
λ, thermal conductivity (mW·m ·K )
5.2 These tables were produced by equations from a computer package, “NIST Standard Reference Database 23; Reference Fluid
Thermodynamic and Transport Properties Database (REFPROP): Version 9.0.”10.0.” A wide selection of units (SI units,
engineering units, chemical units) is available with this program.
6. Additional Information
6.1 The Reference States for enthalpy and entropy have been updated in this version of the Standard.
6.2 A comprehensive equation of state for normal hydrogen is not available at this time. The properties in the table were calculated
from individual equations for normal hydrogen.Reference state properties are required to calculate certain of the thermodynamic
properties (enthalpy, entropy, etc.) from an equation of state formulation.
6.3 The reference state properties used to generate the tables in this specification are: enthalpy, H, and entropy, S, at 298.15 K and
0.101325 MPa (H = 10018 J ⁄mol and S = 186.266 J/(mol K)). The molar mass of hydrogen is 2.0159 g/mol.
6.4 Two new tables have been added at 35 Mpa (350 Bar) and 70 Mpa (700 Bar). These are the most common fuel pressures used
for vehicles using hydrogen fuel cells.
7. Keywords
7.1 hydrogen fuel cell; hydrogen gas tables; thermodynamic p
...