Operating manual for the PSE and G hydrogen reservoir containing iron titanium hydride

the necessary thermal load. In this case the hydrogen is stored as iron titanium hydride in a pressure vessel; porous metal tubing is used for the barrier, and an internal heat exchanger is provided to handle the thermal load. The hydride may be cycled many times provided gaseous impurities that degrade its performance are excluded from the system. Water at readily available temperatures (approximately 60 and 120 deg F) is suitable for use as the heat exchange medium. Tests have shown that design specifications may be exceeded. It will take up H/sub 2/ at a rate >1.5 lb/hr, deliver it at a rate>1.0 lb/hr, and its working capacity is significantly more than the 10 lb of H/sub 2/ originally specified. A compressor (500-psig rating) is required to pressurize H/sub 2/ leaving the electrolyzer in order to obtain a practical sorption rate. The temperature and flow rate of the water in the heat exchanger tubes also are an important factor with respect to sorption and desorption rates. (MCW)