Abstract: A weight management system comprised of a body worn device which interfaces periodically with a computer. The established weight goals of the user are translated by the computer into daily activity targets and downloaded into the device. The device monitors the user's activity, offering progress status toward the daily activity target. Further, the device alerts the user of excessive sedentary periods which depress metabolic indicators. The activity targets, allowed length of sedentary periods and suggested activities to reach goal are specific to the individual based on their biometrics and living environment. The computer provides historical tracking of activity for motivational and coaching purposes.

Abstract: A primary surface recuperator is made from a plurality of components, one of such components being a primary surface sheets. The primary surface sheet is used to transfers heat from a donor fluid to a recipient fluid. A first sheet portion of the primary surface sheet has a pair of sides and has a preestablished thermal deformation characteristic including a resistance to high temperature deformation and a high temperature resistance to corrosion. A second sheet portion has a pair of sides and has a preestablished thermal deformation characteristic being less than the resistance to high temperature deformation and the high temperature resistance to corrosion of the first sheet portion. The first sheet and the second sheet are attached at a respective one of the pair of sides of the first sheet portion and the second sheet portion forming an axis. The axis is positioned at an angle to the pair of sides.

Abstract: A primary surface recuperator is made from a plurality of components, one of such components being a primary surface sheets. The primary surface sheet is used to transfers heat from a donor fluid on a donor side to a recipient fluid on a recipient side. And to increase the efficiency of this transfer, the primary surface sheet is made from a very thin material. Thus, as the primary surface recuperator cycles, the temperature of the primary surface sheet increases in temperature and decreases in temperature during the cycling. This results in the primary surface sheet experiencing a high degree of thermal deformation.

Abstract: Primary surface recuperators generally undergo severe thermal and pressure cycles. Thermal cycling tends to cause the primary surface recuperator to expand along a central axis. However ducting connected with the primary surface recuperator tends to limit its expansion. Constructing bars in cells of the primary surface recuperator from the same material as the ducting tends to reduce thermal stresses that may otherwise result from difference in thermal expansion.