Hydrogen Conversion Factors and Facts Card (Revised)

1 Produced by the National renewable Energy Laboratory (NREL)NREL is a national laboratory of the Department of Energy, Office of Energy Efficiency and renewable Energy, Operated by the Midwest Research Institute BattelleDOE/GO-102008-2597 October 2008 Printed with a renewable -source ink on paper containing at least 50% wastepaper, including 10% postconsumer :Increase your H2IQ Cell Standards Installation Permitting Guide permitting/ Hydrogen Data Hydrogen is colorless and odorless Detectors are needed Hydrogen flames are virtually invisible in daylight Detectors are needed Hydrogen disperses times as fast as natural gas. 1 kg of Hydrogen has the same energy content as 1 gallon ( kg) of gasoline. Department of Energy Hydrogen Program GasGasolineNo. 2 Dieselphysical statecompressed gas or liquidcompressed gasliquidliquidflammability range in 74% 15% heating value (btu/lb)52,21720,26318,67618,394boiling temperature ( F)-423-25980 437356 644specific gravity (60 F) content per gallongas: 6,500 Btu at 3,000 psigas: 33,000 38,000 Btu at 3,000 psi109,000 125,000 Btu128,000 130,000 Btuautoignition temperature ( F)1,085900 1170495600latent heat of vaporiza-tion (Btu/lb at 60 F) point ( F)-435-296-40-30 to -40 Source: DOE Office of Energy Efficiency and renewable Energy.

2 FactorsPressure1 bar = megaPascal (MPa) = lbf/square inch (PSI)5,000 psi = 345 bars = MPa10,000 psi = 689 bar = MPaVolume1 standard cubic foot = liters [standard conditions are atmospheric pressure and 60 F (16 C)]Mass1 kilogram = poundsEnergy1 British thermal unit (Btu) = 1, joules (J)1 calorie (cal) = joules (J)1 kilowatthour (kWh) = megajoules(MJ)Temperature C = ( F-32) x 5/9