Multi-Stroke Variable Displacement Oscillating Pump for Hydrokinetic Energy

Over 1 billion people suffer from the effects of water scarcity. The vast majority of those affected live near a coastline in developing countries, on islands, and in remote communities. To satisfy the potable water needs of a growing world population, experts agree that seawater desalination on a large scale is required. Near-shore ocean waves provide an inexhaustible, consistent, and widely distributed energy resource accessible to a high percentage of the world population. An oscillating flap wave energy converter coupled with a novel seawater compatible pump has been proposed with power-take-off (PTO) for powering reverse osmosis seawater desalination systems, thereby eliminating the need for costly and environmentally damaging diesel generators and oil - based hydraulic fluids. Flow and pressure regimes in seawater PTO are highly variable due to the nature of wave energy resources. This project will develop a seawater compatible oscillating pump with variable displacement to stabilize the pressure and flow dynamics. Through collaborative research with University of Minnesota, Resolute Marine Energy proposes a novel, highly efficient radial piston pump with mechanism to vary the displacement of the pistons. Varying the flap-pump displacement proves a real-time means for flow control, stabilizing pressure and flow rates within the system. Proposed Phase 1 work will 1) develop conceptual design documents, 2) evaluate seal designs, 3) assess tribological wear, 4) model machines performance and 5) Conduct technoeconomic assessment to quantify the impact of this innovation on the levelized-cost of water production.In addition to solving water security issues, wave powered desalination plants may provide a quiet, low-cost water supply for resorts, marinas, and seaside communities interested in capitalizing on their renewable energy resources. Additionally, the technology may be configured to provide electric power exclusively, thus enhancing the portfolio of renewable energy options available to consumers and electric power providers.