12 Questions
What is the purpose of humidifiers in PEM fuel cells?
To balance moisture levels
Which type of batteries are used to store electrical energy in fuel cell hybrid vehicles?
NiMH
What is the main technical issue that must be solved for fuel cells to be adopted for vehicle applications?
Hydrogen storage
What is the function of heat exchangers in fuel cells?
To remove waste heat
What is the benefit of using ultracapacitors in fuel-cell hybrid vehicles?
Wide temperature range
What is the downside of using ultracapacitors in fuel-cell hybrid vehicles?
Lack of specific energy
What type of energy storage can store hydrogen in solid form?
Metal hydrides
What is the function of the power control unit (PCU) in fuel-cell hybrid vehicles?
To direct the flow of electricity between components
What type of combustion process can deliver gasoline-like emissions?
Homogeneous Charge Compression Ignition (HCCI
What is the function of fuel cell cooling systems?
To remove waste heat
What type of motors are used in fuel-cell hybrid vehicles?
Electric traction motors
What is the purpose of fuel cell hybrid vehicles using both a fuel cell and an electrical storage device for power?
To increase fuel efficiency
Study Notes
- Water management is critical in PEM fuel cells to prevent oxygen blockage and electrolyte dry out.
- Humidifiers balance moisture levels in the fuel cell.
- Fuel cell cooling systems are necessary to remove waste heat.
- Heat exchangers with a larger surface area are needed due to low-grade heat generated by the fuel cell.
- Fuel cell hybrid vehicles rely on both the fuel cell and an electrical storage device for power.
- Secondary batteries, such as NiMH, are used to store electrical energy.
- Hydrogen storage is a technical issue that must be solved for fuel cells to be adopted for vehicle applications.
- High-pressure compressed gas and liquefied hydrogen are storage options for hydrogen.
- Metal hydrides can also store hydrogen in solid form.
- Ultracapacitors can store electrical energy without a chemical reaction.
- Ultracapacitors are efficient for electric-assist applications in fuel-cell hybrid vehicles.
- They are made up of multiple cylindrical cells connected in parallel.
- Ultracapacitors have excellent cycle life and can operate over a wide temperature range.
- The downside is a lack of specific energy, making them suited for sudden bursts of energy.
- Fuel-cell hybrid vehicles use electric drive motors that require only a simple reduction in their final drive and a differential to send power to the drive wheels.
- The electric traction motors used in fuel-cell hybrid vehicles are similar to those in current hybrid electric vehicles.
- The drivetrain of a fuel-cell hybrid vehicle is controlled by a power control unit (PCU).
- The PCU controls fuel-cell output and directs the flow of electricity between the various components.
- Homogeneous Charge Compression Ignition (HCCI) is a low-temperature combustion process that can deliver gasoline-like emissions.
- Ongoing research is focusing on improving fuel economy under real-world operating conditions and controlling costs.
Take this quiz to test your knowledge on various technical aspects of fuel cell technology. From water management to hydrogen storage, and from ultracapacitors to fuel cell hybrid vehicles, this quiz covers it all. Sharpen your understanding of fuel cell systems and their components with this informative quiz.
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