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2.4 Criteria for efficiency 17 • the sum of gas compression work input and the total thermomechanical exergy since this exergy would otherwise be available to perform other work as shown by Pyke et al.[42] and Puruhama et al.[41]. It may be that if thermomechanical exergy recovery from cryofuels becomes the norm, the efficiency of processes in harvesting that exergy will become important. In most cases, for fuel cell system analysis, the power consumed by peripheral equipment is calculated as a percentage of the power output of the PC, ie. as parasitic power consumption. In accordance with this, the parasitic power consumption of this refrigeration purification system may be calculated using only the power consumed by the air blower to overcome the pressure drop. Por example, the air pump supplied by Elenco[62] for their standard APC module (1.2kW) has a power consumption of 125W. The total pressure differential of 100mbar is due to 20mbar through the CO2 scrubber and filter, and the rest (80mbar) through the fuel cell stack. At the same efficiency and flow rate, the power consumed for the CO2 scrubber alone would be 25W or ~2% of the output. This is not directly scalable and may be 0.5-0.7% for higher power PC's[62]. An POM calculated on this basis for the Elenco scrubber, works out to 0.023; Since the CO2 removal apparatus for this project is sized based on the Elenco nv. standard module, this provides one simple comparison.PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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