L19-fuelcell4-1 - Fuel Cells Systems 1 8/19/2005 LECTURE...

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Unformatted text preview: Fuel Cells Systems 1 8/19/2005 LECTURE LECTURE LECTURE LECTURE # # # # 19 19 19 19 TOPIC TOPIC TOPIC TOPIC: F u e l C e l l S y s t e m s Fuel Cells Systems 2 8/19/2005 Introduction s A fuel cell stack requires fuel, oxidant and coolant in order to operate s Some of the parameters which have to be regulated are b Composition b Pressure b Flow rate b Humidity b Coolant temperature s Suitable alarms must shut down the process if unsafe operating conditions occur and a cell voltage monitoring system must monitor fuel cell stack performance s These functions are performed by electrical and control systems Fuel Cell Systems Fuel Cells Systems 3 8/19/2005 s When a fuel cell power-plant is installed in a transit bus it must interface with b Power train b Steering circuit b Bus cooling system b HVAC system s The steering circuit uses pressurized hydraulic oil to operate the steering mechanism s The bus cooling system removes heat from standard bus and fuel cell components, supplies heat to the HVAC system, and rejects waste heat to the environment s The HVAC system provides coach heat and air conditioning s To ensure passenger safety a leak detection system to detect escaped hydrogen and a fire suppression system to detect and extinguish fires Fuel Cell Systems Fuel Cells Systems 4 8/19/2005 System Descriptions s The following system descriptions pertain to a bus application using pure hydrogen stored as a high pressure gas s These descriptions are based on fuel cell buses designed and built by XCELLSiS Fuel Cell Engines, Inc s These descriptions indicate the basic functionality of each system, the type of components required, and their interrelationships s Specific fuel cell buses differ from these descriptions in a variety of details depending on b The state of the art at the time of manufacture b Constraints imposed by the specific bus chassis b The level of component integration Fuel Cell Systems Fuel Cells Systems 5 8/19/2005 Air System s The air system supplies regulated air to the fuel cells to feed the power generation reaction s Ambient air enters the air system and passes through a particulate filter to remove debris from the air and a silencer to muffle the downstream compressor noise s The air is compressed in two stages using a air compressor and a turbocharger s The speed of the air compressor both increases the air pressure and sets the air flow rate s The turbocharger further increases the pressure by recovering energy from the exhaust air stream s Under normal operating conditions, the air pressure entering the fuel cell stacks is nominally 30 psig (2 barg) Fuel Cells Systems 6 8/19/2005 s Air pressurization greatly increases the temperature of the air stream and may introduce oil particles from the interaction of the lubrication system with the compressors s To prevent damage the hot air stream passes through an intercooler after the air compressor to cool it to operating temperature s The heat is transferred to the bus cooling system s...
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This note was uploaded on 09/05/2011 for the course LECTURE 101 taught by Professor Staff during the Fall '09 term at University of Florida.

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L19-fuelcell4-1 - Fuel Cells Systems 1 8/19/2005 LECTURE...

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