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Humidity of Compressed Hydrogen for Fuel Cell Technology



Peter H. Huang


Compressed hydrogen is one of the most important utilities in fuel cell industry. For the specification of hydrogen fuel quality and for the design of humidification equipment, knowledge of the equilibrium water content of hydrogen as a function of temperature and pressure is desirable. A simple presentation in chart form is usually adequate for most fuel cell applications and such a chart has been prepared based on the information on the water vapor content of a hydrogen-water mixture. Absolute humidity of kilograms of water vapor per kilogram of dry hydrogen is plotted as a function of pressure up to 100 atmospheric pressures for saturation temperatures in the range of -70 °C to 90 °C. The chart can be used directly to determine the water vapor concentration of compressed hydrogen by measuring its dew/frost-point when pressure is reduced to a lower pressure, usually one atmospheric pressure.
Proceedings Title
Proceedings of Fuel Cell Seminar
Conference Dates
October 26-31, 2008
Conference Location
Phoenix, AZ
Conference Title
Fuel Cell Seminar


Compressed gas, humidity, hydrogen, second virial coefficient, uncertainty


Huang, P. (2008), Humidity of Compressed Hydrogen for Fuel Cell Technology, Proceedings of Fuel Cell Seminar, Phoenix, AZ (Accessed July 22, 2024)


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Created October 31, 2008, Updated February 19, 2017