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1. (WO2018002182) SMA BUNDLE PISTON CUSHIONING SYSTEM FOR USE IN AN ENERGY RECOVERY DEVICE

Pub. No.:    WO/2018/002182    International Application No.:    PCT/EP2017/066064
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Thu Jun 29 01:59:59 CEST 2017
IPC: F03G 7/06
Applicants: EXERGYN LIMITED
Inventors: O'TOOLE, Kevin
Title: SMA BUNDLE PISTON CUSHIONING SYSTEM FOR USE IN AN ENERGY RECOVERY DEVICE
Abstract:
The invention provides an energy recovery system comprising a plurality of Shape-Memory Alloy (SMA) or Negative Thermal Expansion (NTE) elements arranged as a plurality of wires positioned substantially parallel with each other to define a core; a hydraulic chamber in communication with one end of the core and adapted to convert movement of the core into energy; and an energy storage device adapted to provide a lower pressure relative to the pressure in the hydraulic chamber. The invention addresses an unbalance in stress distribution across the SMA bundle that occurs as a result of the mechanism of fluid input into the SMA core. The net effect of the fluid dynamics at the entrance to the core is that SMA wires at the exterior of the bundle activate before wires on the interior of the bundle.