15 Nm3/h hydrogen is produced from an alkaline electrolyzer at 10 bar pressure and 75oC.

a) If the hydrogen produced is stored as a liquid at 1 bar pressure at 33K, how many m3 will the required storage volume be? Calculate the approximate amount of heat that must be withdrawn from the hydrogen for the hydrogen to be stored in liquid form under these conditions.

b) Approximately how many m3 should the tank volume be required for an automobile to store 5.6 kg of hydrogen at 700 bar pressure at 25oC?