In the present invention, the regenerator and the acceptor and rejector heat exchangers are reconfigured so that the gas flows through the regenerator in the radial direction. As a consequence, the regenerator isotherms are ideally in the form of concentric cylinders rather than axially spaced disks; and the temperature gradient is across the regenerator radially rather than axially. NASA Tech Brief. Stapled pamphlet. 8.5" X 11"