Скачать или смотреть A residential solid-oxide fuel cell is operated on methane (CH4) and is designed toprov

chapter 2 problem 2.18.A residential solid-oxide fuel cell is operated on methane (CH4) and is designed to
provide the household with both heat and electricity.
(a) Assuming that the fuel cell is operated at j = 1 A∕cm2 and V = 0.6 V, how much
fuel cell active area (in cm2) would be required to deliver 3 kW of electrical
power? (This is approximately enough to provide power to the average American
home.)
(b) At the fuel cell’s standard operating condition (750∘C, 1 atm), Δh and Δg for
methane combustion are –802 and –801 kJ/mol, respectively. (Note: This is not
a typo; Δh and Δg are almost equal for this reaction.) Assuming 100% fuel utilization, what is the rate of heat generation by the fuel cell (Pheat, in kW) when
operated at j = 1 A∕cm2 and V = 0.6 V?
(c) Assuming 100% fuel utilization, how much water (in liters) would be produced
during 24 hours of operation at Pelec = 3 kW? (Recall: molar mass of water = 18
g/mol, density of water = 1 g/cm3.)
(d) Given that the average American household water consumption is ∼200 gal/day
(∼ 750 L∕day), would this fuel cell be able to supply the average American
household’s entire daily water requirements in addition to its electrical power
requirements? (Provide support for your answer.)