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Author:Viitakangas, Jaana
Title:Theoretical and experimental study of a 10 kilowatt proton exchange membrane fuel cell's thermal and moisture system control
10 kilowatin polymeeripolttokennon lämpö- ja kosteudenhallintajärjestelmien teoreettinen ja kokeellinen tutkimus
Publication type:Master's thesis
Publication year:2008
Pages:67      Language:   eng
Department/School:Energiatekniikan laitos
Main subject:Lämpötekniikka ja koneoppi   (Ene-39)
Supervisor:Lampinen, Markku
Instructor:Ihonen, Jari
Electronic version URL: http://urn.fi/urn:nbn:fi:tkk-100393
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  5919   | Archive
Keywords:PEMFC
air and water management
pressurization
PEMFC
ilman- ja kosteudenhallinta
paineistus
Abstract (eng): A fuel cell is an electrochemical device that converts fuel and oxidant into electricity.
Fuel cells are considered a promising future energy technology, due to their potential for efficient and environmental energy production.

In this thesis a middle pressure, 10 kW scale electrical power proton exchange membrane (PEM) fuel cell system has been studied, concentrating on air and moisture management.
The issue of whether a small pressurization could benefit the PEMFC system has been examined.
Since the examination is targeted to a real system that could be built of serial production components, system component availability has also been mapped.
It was noted that there are no commercial compressors for the PEMFC systems in this power range.

Pressurization is known to have many advantages over non pressurized fuel cell systems, namely pressurization makes the system smaller and lighter and therefore cheaper.
Pressurization also eases water management, since at higher pressures less water is needed to reach the same relative humidity levels.
However, the high pressure systems are more complex and costly to build because of required special equipment.
In this work, middle pressure denotes the pressures between atmospheric and 1.5 bar.

In this study net power gain was not achieved, mainly because of blowers in this range have fairly low efficiencies and best efficiency area is typically narrow.
The power density increases by pressurization and this leads system size and cost reductions.
Abstract (fin): Polttokenno on sähkökemiallinen laite, joka muuntaa polttoaineen ja hapen suoraan sähköksi.
Polttokennot ovat lupaava energiantuotantomuoto, sillä niillä on edellytykset tehokkaaseen ja ympäristöystävälliseen energiantuotantoon.

Tässä diplomityössä on tutkittu sähköteholtaan 10 kW luokan keskipaine polymeeri elektrolyytti membraani polttokenno (PEMFC) järjestelmää.
Työssä on keskitytty ilman- ja kosteudenhallintaan, tutkimalla voisiko pieni paineennosto hyödyttää PEM-polttokennojärjestelmiä.
Koska tarkastelussa on keskitetty rakennettavissa oleviin järjestelmiin, myös järjestelmäkomponenttien saatavuutta on kartoitettu.
Katsauksessa selvisi, ettei tämän kokoluokan PEM polttokennoille ole kompressoreita markkinoilla.

Paineistuksen tiedetään tuovan useita etuja normaalissa ilmanpaineessa toimiviin PEM polttokennoihin nähden.
Keskipainejärjestelmästä tulee kevyempi, pienempi ja näin ollen halvempi.
Paineistus myös helpottaa kosteudenhallintaa.
Korkeapainejärjestelmät ovat kuitenkin monimutkaisempia ja vaadittavien erityiskomponenttien vuoksi kalliimpia rakentaa.
Tässä työssä keskipainejärjestelmällä viitataan paineisiin normaalin ilmakehän ja 1.5 bar välillä.

Tässä tutkimuksessa nettotehoja ei pienellä paineistamisella saavutettu, johtuen pääasiallisesti puhaltimen huonosta hyötysuhteesta sekä kapeasta parhaan hyötysuhteen alasta.
Paineistaminen kuitenkin parantaa tehotiheyttä, joka tietyissä sovelluksissa voi olla hyötysuhdettakin tärkeämpää.
ED:2008-12-10
INSSI record number: 36589
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