Fuel economy analysis of fuel cell and supercapacitor hybrid systems

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Fuel cells generally have a higher energy density by a lower power density than batteries, and a fluctuating load can cause unstable operation as well as low efficiency. A hybrid in which a fuel cell is combined with an energy storage element with higher power density, such as a battery or supercapacitor, can enhance the load-following capability of a fuel cell system. We analyze the design space of a proton exchange membrane fuel cell (PEMFC) and supercapacitor hybrid system, and forecast the break-even operating period of the hybrid, at which the additional cost of hybridization is met by reduced fuel costs. The combination of a 100 W PEMFC and a supercapacitor with the earliest cost break-even time uses 6.8% less fuel than a base fuel cell, and has a 50% higher peak power capacity. The additional supercapacitor cost for hybridization is recoverable in 1152-6480 h of operation, while the typical guaranteed lifetime of a commercial fuel cell is around 3000 h.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-01
Language
English
Article Type
Article
Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.41, no.3, pp.1381 - 1390

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2015.10.103
URI
http://hdl.handle.net/10203/208024
Appears in Collection
EE-Journal Papers(저널논문)
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