> ^.^•^r^^^<r , "'^'-^**^'**^»*r~^"-'^^^ ,r ^^ T Tr«--*^:^ 



«*.^i.iX(;. J .>a.- ■■:. .. ;■■■ 



Contents (Continued) 



Page 



Appendix A - METAL HYDRIDE HEAT PUMP SYSTEM ANALYSIS .*...... 49 



1 

 Appendix B - HEATING-CGGU>:G SYSTEM ANALYSIS 52 * 



LIST OF ILLUSTRATIONS % \ 



Page 



Figure 1. Comparison of cost, weight, and volume of hydrogen 



containers holding 21 pounds of hydrogen 5 



Figure 2. Typical pressure-composition diagram for a csetal- 



hydrogen system • '2 



Figure 3. Dissociation pressures of metal hydrides 14 



Figure 4. Hysteresis in metal-hydrogen systems <5 



FIfure 5. Pressure-composition isotherms for the most 



promising metal-hydrogen systems 29 



Figure 6. Pressure-composition isotherms of various rare earth- 

 hydride systems. These curves are from Reference 28, 

 Hydrogen storage and purification systems, by J. J. 

 Reilly and R. H. Wisvall, Jr., Brookhaven National 

 Laboratory and are printed with its permission 30 



i 

 Figure 7. Pressure-composition isotherms for several metal- 

 hydride systems 31 



Figure 8. Metal-hydride/container concepts 36 



LIST OF TABLES 



Page 



Table 1. Comparison of Storage Properties of Various Fuels ... 2 



Table 2. Intermetallic Hydrides Included in the Literature 



Survey " 



Tahlf 3. Properties of Various Compounds That May be Used for 



Metal Hydride Storage 21 



