L20-fuelcell4-2 - 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 # # # # 20 20 20 20 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 The lubrication system provides lubrication and cooling to key rotating components s Lubrication oil resides within the sump of the drive motor s A pump forces the oil through a particulate filter and into a distribution manifold s The manifold first directs the oil through the lubrication oil cooler, where it expels heat to the bus cooling system, and then distributes the oil flow through the following components: b bus chassis air compressor turbocharger b air compressor b gearcase (used to drive ancillary components) b drive motor b alternator Lubrication System Fuel Cells Systems 3 8/19/2005 The manner in which the individual components are plumbed together (whether in parallel or series) depends on the nature of each lubricating load and the physical location of each component within the bus chassis s The lubrication system uses synthetic oil with a low vapor pressure in order to minimize the amount of oil that diffuses into the air stream within the air compressor and turbocharger s This decreases the risk of fuel cell contamination Lubrication System Fuel Cells Systems 4 8/19/2005 Figure: Lubrication System Flow Diagram Lubrication System Source: http://www.eere.energy.gov/hydrogenandfuelcells Fuel Cells Systems 5 8/19/2005 The hydraulic system powers b The radiator fans b The power steering system s The hydraulic system consists of b Radiator fan circuit b Power steering circuit Hydraulic System Fuel Cells Systems 6 8/19/2005 Figure: Hydraulic System Flow Diagram Hydraulic System Source: http://www.eere.energy.gov/hydrogenandfuelcells Fuel Cells Systems 7 8/19/2005 Radiator Fan Circuit s The radiator fan circuit draws hydraulic fluid from a tank using a variable speed pump s The fluid then splits into three streams s Two of the streams pass directly through respective radiator fan motors s The third stream flows to a pressure relief valve s The pump speed, and therefore fan speeds, varies according to heat rejection requirements s Each of the two radiator fan motors is connected to a fan that draws air through the radiator in order to expel heat from the bus cooling system to atmosphere Hydraulic System Fuel Cells Systems 8 8/19/2005 Figure: Hydraulic System Flow Diagram Hydraulic System Source: http://www.eere.energy.gov/hydrogenandfuelcells Fuel Cells Systems 9 8/19/2005 Power Steering Circuit s The power steering circuit draws hydraulic fluid from a tank using a pump s In some systems this tank is the same as that used in the radiator fan circuit; in others, a separate tank is used s The fluid leaving the pump enters the vehicles power steering system where it drives standard bus manufacturers components s The fluid returns to the tank Hydraulic System Fuel Cells Systems 10 8/19/2005 Figure: Power Steering Pump Hydraulic System Source: http://www.eere.energy.gov/hydrogenandfuelcells http://www....
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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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L20-fuelcell4-2 - Fuel Cells Systems 1 8/19/2005 LECTURE...

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