



,.;:• qj&zi 

























Tabic 1 





liquid Hj 



Presssrizcd H* 























2.000 psia 



7,600 psia 



Mg ♦ 6% Ni 



Mg + 9%Cu 



Fell 





Density (lb/ft 3 ) 



4.42 (631 



0.76 [63i' f 



2.6 I63l rf 



100 



100 



362 



240 



(gm/cm 3 ) 



010700 



0.12 163]'' 



- 



1.6* 



5.8 1571 



3.E5 U 



H 2 density (lb Hj/ft 3 ) 



4.42 



0.764 



2.6 



6.7 



5.9 



6.9 



3-6 



<void fraction = 0) 

















Weight fraction (lb H./lb compound) 



IjOO 



1.00 



1.00 



0.067 



0059 



0019 





Atom ratio (atoms H/forrnula unit) 



- 



- 



- 



2.0 1321 



1.K8 |56l 



1.9 





AHjog (Btu/lb mole H 2 ) 



-30,600 



-8.800 



-13.000 



-33.000 



-33.660 



-14.50O 



-13, 



(Kcal/gm mole H 2 ) 



W 



-4.9* 



-7.3* 



!8.5 (32! 



-18.7 1561 



-8.06- |S7l 



-7X 



Working temperatute °F 



-423 [631 



70 



70 



620 



620 



104 





°C 



-253 



21 



21 



320 (32) 



320 [56| 



40 1571 





Plateau pressure (psu) 



14.7 1631 



2,000 



7.500 



44-147 



44-147 



118-221 





at working temp (Atm) 



1.0 



136 



510.2 



3-10 1321 



3-10 1561 



8-15 1571 





For Energy Equivalent to 10 

















Gallons of Gasoline* 

















Weight of hydride (lb) 



21.2 



21.2 



21.2 



317 



360 



1.061 





(Kj* 



9.6 



9.6 



9.6 



144 



163 



481 





Volume of hydride (ft 3 ) 



4.8 



27V 



8.1' 



3.2 



3-6 



3.1 



5.5 



(void fraction = 0) (m 3 ) 



1.5 



8.5 



2.5 



10 



1.1 



0.9 



li 



Cost estimate* (S/lb) 



- 



- 



- 



1.1 



LZ 



23 





Stability at 70°r" 



boils 



high pressure 



stable 



stxbte 



sable 





Problems 



needs 



requires heavy tanks 



high temp 



high temp 



low V.I S 







nsulation 



for storage 



high AH 2 9g 



high LS\-y<\a 



H 2 





Constants used in calculations. 



Gasoline 

 Hydrogen gas 

 fdrogen liquid 



Lower Heating Value 1651 

 tBlu/lb) 



19.500 

 51.600 

 51.600 



Density 

 (lh/ft 3 l 



42= 5.6 lb/gal |65l 

 0.0056 at 70°F. 1 atm 1631 

 4.42 at -423°F. I aim 1631 



Reference 35 reports that La Nij H 6 7 has ax apparent density of 3. 8S gm/cm 3 but could possiWy be compressed to 6.74 gm/cm J . 



Mm refers to mischmetal. 



Calculated from data provided in the reference indicated by the number in the brackets. 



Estimate of density based on densities of Mg H 2 at 1.4 gm/cm 3 111) and of Mg 2 Ni H^ at 2.54gjJi/cm 3 1321 . 



Assumed to be similar to Mg * 6% Ni. 



Liquefaction of hydrogen quantity of energy equal to 30 to 49% of energy stored in L rU I7|. 



Assumes that electrolytic hydrogen produced at 300 psig and 250°F |5I is compressed by a corrpressor with an isentropic efficiency of 0.9 164 1 to the i 



1 gallon gasoline = 109, 200 Btu = 2.1 2 lb Kj 1651 . 



From Perfect Gas Ijw. 



Based on data from Reference 66. 



