•ettmwraseaw^oiaesaiEasss-^.aa^. 



UCgftTt CL 



Block 20. Cominv.t<i. 



was found to be able to store hydrogen uadcr different experimental coalitions, and each 

 has its unique properties and h^mSling characteristics. 



The survey was followed by a conssderauori of aress of possible u.rful applications. 

 Several areas where metal hydrides can be cf use are Jtscusse i in detail, including energy 

 storage at remote bases and combat zones, uedcrwatcr fuel storage, fuel and heat storage in 

 dosed system opera nor*, and their use in heat pumps and automotive amplications. 

 Because of the ability of metal hydrides i> *»ppl> hydrogen and absorb exhaust heat at 

 the same time, and to deinrer this absorbed heat during rev-hargiEj where a can be used, 

 they are useful in achieving better utilization of available energy. 



l-ibrtrv Card 



CvD Engineering Labctrarory 



METAL HYDRIDES FOR ENERGY STORAGE APPLICATIONS. 



by S. C Garg and A. S. McCUine 



TN-U9J S6p. ilhs June 1975 Classified 



1 . Thermal aisulatioa 2. Heat transfer i. Heat sinks I. Z-RflOO-01-1 39 



A survey was nude of metal hydrides iot energy storage in tiie form of hydrogen, heat, 

 and a combination of bora, rive intermct«u>c compounds were found to be premising energy 

 storage vehides. They we—- MgS'i. FeTi, LaNi5. Lao 7CeojtNi5. and Mrtchrneal NJ5 # The most 

 important property common to all these by indes is their ability to store large quantities of 

 hydrogen per cubic foot of the hydnde: berween 5 and 7 pounds per cubic foot compared to a 

 liquid hydrogen density of about 4.4 pounds per cubic foot. Each of rinse cotrpounus was found 

 to be able to store iivdrogen under different experimental conditions, and each has its unique 

 properties and handling characterises. The lorvcy was followed by a consideration of areas of 

 possible useful applications. Several areas whrre metal hydrides can be of use are discussed in 

 detail, including energy stoe>" e it remote bases and combat rones, underwater fuel storage, fuel 

 and heat siorage in dosed system operations, and tneir use in heat pumps and xutomotive appli- 

 cations. Because of the aV. .- v of metal hydr>ies to supply hydrogen and absorb exhaust heat at 

 the same tune, and to dclner this absorbed beat during recharging where it can be used, they are 

 useful in achieving better utilization of available energy. 



