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Experimental investigation on water injected twin screw compressor for fuel cell humidification

Ous, T., Mujic, E. and Stosic, N. (2012). Experimental investigation on water injected twin screw compressor for fuel cell humidification. Proceedings of the Institution of Mechanical Engineers, Part C, Journal of Mechanical Engineering Science, 226(2), pp. 2925-2932. doi: 10.1177/0954406212438323

Abstract

A water injection in Twin Screw compressors was examined in order to develop effective humidification and cooling schemes for fuel cell stacks as well as cooling for compressors. The temperature and the relative humidity of the air at suction and exhaust of the compressor were monitored under constant pressure and water injection rate and at variable compressor’s operating speeds. The experimental results showed that the relative humidity of the outlet air was increased by the water injection. The injection tends to have more effect on humidity at low operating speeds/ mass flow rates. Further humidification can be achieved at higher speeds as higher evaporation rate becomes available. It was also found that the rate of power produced by the fuel cell stack was higher than the rate used to run the compressor for the same amount of air supplied. The efficiency of the Balance-Of-Plant (BOP) was therefore higher when more air is delivered to the stack. However, this increase in the air supply needs additional subsystems for further humidification/ cooling of the BOP system.

Publication Type: Article
Publisher Keywords: Fuel cell stack, twin-screw compressor, air supply, water injection, humidity, temperature, balance of plant, power
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
URI: http://openaccess.city.ac.uk/id/eprint/2334
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