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ARPA-E Projects

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Displaying 1 - 3 of 3
Program: 
Project Term: 
05/10/2018 to 04/15/2020
Project Status: 
ACTIVE
Project State: 
Hawaii
Technical Categories: 

The Kampachi Farms team will lead a MARINER Category 1 project to design and develop technologies to deliver deep seawater nutrients to a novel macroalgae production farm concept suitable for deployment in tropical and subtropical deep ocean environments. The superstructure of macroalgae farms typically consists of an anchor grid that tethers the farm in a fixed location and orientation. The Kampachi Farms team aims to disrupt this model by designing a macroalgae array anchored by a single-point mooring, or anchor point. Single-point mooring will allow the farm to align itself with the current, drastically reducing stress loads and improving the efficiency of nutrient dispersal. Additionally, the team has proposed a low-cost upwelling system to deliver nutrients from deeper waters to the macroalgae farm above to solve the issue of low nutrient content surface waters that would slow macroalgae growth. Since the nutrients will always flow downcurrent, and the farm self-aligns itself in that direction, the upwelled nutrients will be more efficiently dispersed across the array. The team believes that these elements, when tested and refined together, can reduce the capital and operating cost of macroalgae cultivation, while increasing the range of deployment into a large swath of the U.S. Exclusive Economic Zone that is currently inhospitable to commercial macroalgae cultivation because of the high costs to moor arrays and the lack of nutrients in surface waters.

Program: 
Project Term: 
08/07/2019 to 08/06/2022
Project Status: 
ACTIVE
Project State: 
Hawaii
Technical Categories: 
Program: 
Project Term: 
05/21/2018 to 11/20/2019
Project Status: 
ACTIVE
Project State: 
Hawaii
Technical Categories: 

Makai Ocean Engineering will lead a MARINER Category 3 project to develop tools to simulate the biological and structural performance of offshore macroalgae systems. Macroalgae farming systems will require significant capital and operating costs. Investment and management decisions can be guided by the development of advanced modeling tools to help better understand the nature of macroalgae production for profitable operation. Makai's project will result in a hydrodynamic-mechanical model which simulates forces on offshore algae structures from to waves and currents. Output from the model will be used to size primary components of the offshore systems, and to create cost estimates based on these components. Several scenarios will be modeled for varying wave sizes, water depths, and currents, and thus the results will inform trends in system cost versus oceanographic conditions. These trends will be used to determine the capital cost required per hectare of farm. Additionally, a three-dimensional and time-varying ocean circulation and biological algae model will be developed to simulate the transport, mixing, and consumption of nutrients and resulting algae growth rates. Multiple algae farm configurations will be modeled to gain an understanding of the tradeoffs between system size and nutrient supply requirements. Modeling tools like Makai's system will be critical for designing macroalgae farm components and systems which meet target costs and harvest yields to make them commercial viable and scalable.