ASTM_D_7265_-_12_2018.pdf

Designation:D726512(Reapproved 2018)Standard Specification forHydrogen Thermophysical Property Tables1This standard is issued under the fixed designation D7265;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 The thermophysical property tables for normal hydro-gen are for use in the calculation of the pressure-volume-temperature(PVT),thermodynamic,and transport propertiesof hydrogen for process design and operations,particularly asthey relate to hydrogen fuel cell applications.Tables areprovided for gaseous hydrogen at temperatures between 50 Kand 500 K at pressures to 50 MPa.These tables were developedby the National Institute of Standards and Technology from aStandard Reference Database product REFPROP,version 9.0.1.2 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Applicability2.1 These tables apply directly only to pure gaseous hydro-gen.However,it is expected that they may find substantial usein mathematical models and tables for the thermophysicalproperties of mixtures containing hydrogen.3.Tables3.1 The tabulated thermophysical properties are:,molar density(molL-1)V,molar volume(L-1mol)H,molar enthalpy(Jmol-1)S,molar entropy(JK-1mol-1)Cv,constant volume molar heat capacity(JK-1mol-1)Cp,constant pressure molar heat capacity(JK-1mol-1)c,speed of sound(ms-1),viscosity(Pas),thermal conductivity(mWm-1K-1)3.2 These tables were produced by equations from a com-puter package,“NIST Standard Reference Database 23;Ref-erence Fluid Thermodynamic and Transport Properties Data-base(REFPROP):Version 9.0.”A wide selection of units(SIunits,engineering units,chemical units)is available with thisprogram.4.Additional Information4.1 A comprehensive equation of state for normal hydrogenis not available at this time.The properties in the table werecalculated from individual equations for normal hydrogen.5.Keywords5.1 hydrogen fuel cell;hydrogen gas tables;thermodynamicproperties of hydrogen1This specification is under the jurisdiction of ASTM Committee D03 onGaseous Fuels and is the direct responsibility of Subcommittee D03.08 onThermophysical Properties.Current edition approved April 1,2018.Published May 2018.Originallyapproved in 2006.Last previous edition approved in 2012 as D7265-12.DOI:10.1520/D7265-12R18.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 TABLE 1 Hydrogen Thermophysical Property TablesT(K)(molL-1)V(L-1mol)H(Jmol-1)S(Jmol-1K-1)Cv(Jmol-1K-1)Cp(Jmol-1K-1)c(ms-1)(mWm-1K-1)(Pas)0.1 MPa500.242474.12431549.864.23012.54321.131584.838.402.4717550.219974.54611655.466.24312.57921.113613.441.522.6729600.201344.96681761.068.08112.64321.137640.444.602.8655650.185655.38661866.869.77512.74021.204665.847.683.0502700.172245.80571973.171.35012.87121.312689.750.783.2281750.160666.22442080.072.82513.03721.460712.353.613.3999800.150546.64262187.774.21613.23521.643733.656.473.5663850.141637.06052296.575.53413.46221.858753.859.353.7280900.133727.47812406.476.79113.71222.098773.062.173.8855950.126657.89552517.577.99213.98122.359791.365.264.03921000.120308.31272630.079.14614.26422.635808.968.334.18961050.114558.72982743.980.25714.55622.921825.871.654.33681100.109339.14672859.281.33014.85223.212842.174.974.48131150.104569.56352976.082.36915.15023.506858.078.224.62321200.100209.98023094.283.37515.44623.798873.581.484.76291250.0961810.39703214.084.35215.73824.086888.684.784.90041300.0924810.81303335.185.30316.02324.368903.488.095.03591350.0890511.23003457.686.22816.30024.643917.991.365.16961400.0858711.64603581.587.12916.56824.908932.294.625.30151450.0829012.06303706.788.00716.82525.164946.397.795.43181500.0801412.47903833.188.86417.07325.410960.1100.965.56061550.0775512.89503960.889.70117.30925.645973.8104.245.68801600.0751213.31104089.690.51917.53525.869987.3107.515.81401650.0728513.72804219.491.31817.75026.0821000.6110.745.93871700.0707014.14404350.492.10017.95426.2851013.8113.986.06221750.0686814.56004482.392.86518.14726.4771026.9117.116.18451800.0667714.97604615.193.61318.33026.6591039.8120.256.30561850.0649715.39204748.894.34618.50326.8311052.6123.346.42571900.0632615.80804883.495.06418.66626.9941065.3126.446.54471950.0616416.22405018.895.7671