A heat exchange unit 3 wherein {HEAD ~ said closed end hydride container} contains {TAIL ~ an essentially coaxial spring} defining a central hydrogen gas space and confining metallic hydride former against the tube wall 
A heat exchange unit 3 wherein { HEAD ~ said closed end hydride container } contains { TAIL ~ an essentially coaxial spring } defining a central hydrogen gas space and confining metallic hydride former against the tube wall
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH