1. Define the application (which road vehicle? car, truck, bus…)–What are the vehicle’s design parameters?–What range is required?
•2. Convert drive cycle to power cycle. –Select a drive cycle.–Convert drive cycle to power cycle–Maximum power requirement–Average power requirement–Total energy required per drive cycle (distance)
•3. Hybridisation.–What are the benefits of hybridising a fuel cell and battery? –Which hybrid configuration –draw it and justify why.–Note, you should design the hybrid such that the fuel cell operates at a constant average power and the battery accommodates the dynamic load and absorbs regenerative braking.
Design report sections:
•4. Sizing–the size (power) of your fuel cell and size (energy) of your battery.
•5. Which fuel and fuel cell type?–Fuel cell type and temperature of operation –why? Which materials will you use? The bipolar plate material is very important since it determines the mass and volume. Which catalyst type and why?–Which fuel?
Design report sections:
•6. Model fuel cell–Calculate the open circuit potential based on the fuel, temperature and reactant composition used.–Calculate the kinetic, ohmic and mass transport losses.–Construct the polarisation plot (current and voltage)–Show the electrical power and heat generated by the fuel cell–Decide on your operating point (current and voltage)
Design report sections:
•7. Size (physical) the fuel cell. What electrode surface areais required to accommodate your power requirement? This will notionally be a single cell to begin with. –(a) Now make a ‘stack’ from the ‘single cell’. i.e. if 100 cm2is needed operating at a given point on the polarisation plot, we could have 10 cells in the stack, each 10 cm2in area. –(b) Stack overall voltage is equal to voltage of each cell number of cells.–(c) Based on your choice and design of bipolar plate, what is the weight and volume of the stack?•8. What is the reactant flow rate (air and fuel)?
•9. What is the efficiency of the system?–(a) Electrical efficiency.–(b) How much heat is required to be dissipated from the stack?
•10. Which battery technology are you going to use?–How heavy / large will it be?
