NDLI: Development of Water Lubricated Compressor-Expander for Fuel Cell Application

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Stosic, Nikola Ian, K. Smith Kovacevic, Ahmed Mujic, E.
Copyright Year	2010
Abstract	Fuel cells, currently being developed for automotive and stationary applications, require a supply of pressurized air at about 3 bars abs. This is expelled in the reaction products, mainly as water steam and nitrogen, at approximately 100 °C. The power input required to compress the air is typically 20–25% of the cell electrical output. Hence, for the cell efficiency to be acceptable and to recover water conveniently from the reaction products, power needs to be generated by expansion of the reaction products and used to reduce the electrical output from the cell that is consumed by the compressor. Then water may be condensed in a flue gas cooler and returned to process. Screw compressor is a good choice to supply pressurized air at about 3 bars for fuel cell application. It is shown that a twin screw machine can perform both the compression and expansion functions using only one pair of rotors. Moreover, by proper location of the ports, mechanical friction losses within it will be less than if the two functions are performed in separate machines. However, due to strict requirements for oil contamination, the rotors and bearings in such a machine have to be either absolutely sealed or left open and lubricated by water. A research performed at City University is described in the paper on the rotors and bearings lubricated exclusively by water which then can be used in the combined compressor-expander screw machines which are suitable for fuel cell application.
Starting Page	875
Ending Page	881
Page Count	7
File Format	PDF
ISBN	9780791844298
DOI	10.1115/IMECE2010-37437
Volume Number	Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B
Conference Proceedings	ASME 2010 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2010-11-12
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	Compressor Expander Humid air Fuel cell Water Compressors Fuel cell applications Fuel cells
Content Type	Text
Resource Type	Article

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