evaluatie van een alkalische brandstofcel als micro-warmtekrachtkoppeling (micro-WKK) voor gebouwtoepassingen door middel van simulatie
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OMSCHRIJVING
Doctoraatsonderzoek naar de mogelijke toepassing van een alkalische brandstofcel als micro-warmtekrachtkoppeling voor gebouwtoepassingen. Door middel van simulatie op basis van gevalideerde modellen is hier een analyse gemaakt naar themische integratie van de stack in een WKK-eenheid, die ingepast kan worden voor de energiebehoefte van een gebouw. SAMENVATTING Buildings are responsible for almost 40% of the energy use in Europe. Besides this, combined heat and power (CHP) has the potential to reduce primary energy use and is complementary to other sustainable distributed energy systems. This has led to a growing attention for micro-cogeneration (micro-CHP) within buildings. As the energy demand within in buildings is shifting from a more heat driven energy demand to a more (electric) power driven energy demand, fuel cells offer some interesting advantages as technology for micro-CHP. In this work, the potential of an alkaline fuel cell system (AFC-system) as a micro-CHP for buildings applications is investigated. In order to perform this evaluation a model is developed giving insight in the thermal and electrical performance and in the water household of the fuel cell stack. This last parameter is critical for a stable operation of a fuel cell based system. A thorough analysis of the stack behavior has led to the evaluation of new system set-ups and control strategies. The scope here was to simplify the water management and to improve the thermal performance. It was expected the largest improvement potential was to be found here. Finally, the model is used to illustrate the potential as a micro-CHP, with a comparison on part load behavior and two case studies. It is shown that an AFC-system has a very interesting part load behavior. However, despite this advantage, in the elaborated case studies, where a conventional hydrogen production is assumed, primary energy savings are negative or marginal. The model however shows its value to evaluate future energy systems in buildings with a sustainable hydrogen production. RESULTATEN
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DETAIL
Titel "Model Based Evaluation of an Alkaline Fuel Cell System as Micro-cogeneration (micro-CHP) for Building Applications" Doctorandus Ivan Verhaert Promotor Prof. M. DE PAEPE, Department of Flow, Heat and Combustion Mechanics - UGent In samenwerking met Thomas More - UGent - VITO Datum 2013 |