What's mean Types of fuel cells -PEMFC system (1)? by mary lv

What's mean Types of fuel cells -PEMFC system (1)? What's mean Types of batteryfuel cells -PEMFC system (1)?The limitations of the

PEMFC system are high manufacturing costs and complex water management

issues. The stack contains hydrogen, oxygen and water. If dry, the input

resistance is high and water must be added to get the system going. Too much

water causes flooding. The PEMFC has a limited temperature range. Freezing water can damage the

stack. Heating elements are needed to keep the fuel cell within an acceptable

temperature range. The warm-up is slow and the performance is poor when cold.

Heat is also a concern if the temperature rises too high. The PEMFC requires heavy accessories. Operating compressors, pumps and other

apparatus consumes 30 percent of the energy generated. The PEMFC stack has an

estimated service life of 4000 hours if operated in a vehicle. The relatively

short life span is caused by intermittent operation. Start and stop

conditions induce drying and wetting, which contribute to membrane stress. If

run continuously, the stationary stack is good for about 40,000 hours. The

replacement of the stack is a major expense. more info:www.good-battery.com

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