Describe why water management is a critical issue facing fuel cells.
What will be an ideal response?
Water management is one of the most important issues facing fuel cells because water is critical to fuel cells. In some systems like SPFC (PEM), the cells will not operate without water nor will they operate with too much water. Water must be available in the correct amount, not only as liquid, but also in the gases present within the cell. Water is needed in reforming the input fuels. Water is used to cool cells. Water holds the protons in PAFC cells and the hydroxide ions in AFC cells. The operations of fuel cells depend to a great extent on the systems that ensure the timely and correct availability of water.
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PROBLEM 3.9 The torques shown are exerted on pulleys A, B, and C. Knowing that both shafts are solid, determine the maximum shearing stress in (a) shaft AB, (b) shaft BC. The diameter of shaft AB is 1.3 in. and that of BC is 1.8 in.
Find the F, P, and A values for the negative cash flows shown in the diagram.
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A cable modem broad band pipe is an ________ path , one direction carries higher bit per seconds than the opposite path
Fill in the blank(s) with correct word
?How does the body respond to a decrease in convection heat loss?
A. ?lowering internal body temperature B. ?increasing perspiration C. ?reducing skin temperature D. ?it does not respond