For Stationary Applications, Mass and Volume Considerations for a Fuel $60 \%$

For stationary applications, mass and volume considerations for a fuel source are much less important than they are for use in transportation. It therefore may be the most reasonable to sacrifice compactness to minimize requirements for expensive advanced technologies. Consider a plan to provide power to a small city with a population of 100,000 , using hydrogen fuel cells with an efficiency of $60 \%$ . The average net percapita power consumption is $6 \mathrm {~kW}$ for electricity, heat, and power for an electric vehicle.
(a) Calculate the volume of hydrogen needed to provide the city's energy for one month if the hydrogen is stored at a (relatively low) pressure of $1 \mathrm { MPa }$ .
(b) If the city has a land area of $100 \mathrm {~km} ^ { 2 }$ , what fraction of this area would need to be devoted to hydrogen storage if the storage tanks were vertical cylinders $3 \mathrm {~m}$ in diameter and $5 \mathrm {~m}$ high and were packed tightly together in a square array?