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Modeling Ocean Thermal Energy Conversion Plant Discharges

This project aims to design and simulate the discharge component of an OTEC plant to effectively process and sustainably release massive seawater flows. The numerical model will assess the OTEC performance, discharge component design, and potential environmental changes. The research supports OTEC development efforts funded by NavFac, Lockheed, ONR, and the State of Hawaii.

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Modeling Ocean Thermal Energy Conversion Plant Discharges

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  1. Water Power Peer Review Patrick Grandelli, P.E. Makai Ocean Engineering, Inc. Pat.Grandelli@Makai.com, 540-439-8971 27 Sep 2011 Modeling the Physical and Biochemical Influence of Ocean Thermal Energy Conversion Plant Discharges into their Adjacent Waters

  2. Purpose, Objectives, & Integration For 100 MW: 420 m3/s WW (7 M gpm) 320 m3/s CW (5 M gpm) How do we design an OTEC plant to sustainably and economically process and discharge the massive seawater flows associated with OTEC? Use a numerical model to quantify OTEC discharge component design, OTEC performance, and environmental changes that may result from OTEC flows. This bio-plume modeling supports other OTEC development efforts funded by NavFac, Lockheed, ONR and the State of Hawaii

  3. Technical Approach Numerical ocean circulation model of Hawaii. (HIROM) Numerical simulation of plankton growth caused by nitrate enrichment. (in EFDC) Validate the circulation model with new (2010) current and density data. (e.g., temperatures at right indicate vertical nutrient oscillation.) 80m, 20m wave 130m, 25m wave 230m, 30m wave 500m, 30m wave 850m, 40m wave 1000m, 50m wave

  4. Plan, Schedule, & Budget Schedule • Initiation date: 16 Sep 2010, (Final contract during Jan 2011) • Planned completion date: 29 Feb 2012 FY 11 Milestones: • Dec 2010 - Retrieval of oceanographic mooring with 7 months of CTD and ADCP data • April 2011 - Delivered oceanographic data to NOAA Liaison at the University of Hawaii • May 2011 - Gave briefing to David Kennedy, Assistant Administrator for National Ocean Service • Aug 2011 – Larger domain on Linux running successfully • Sep 2011 – Biological module running successfully • Sep 2011 –Presented paper at Marine Technology Society Oceans’11 conference Budget: $240 K DoE, $161 K Lockheed & Makai • No significant budget variances. Subconsultants labor has been less than budgeted • Expenditures as of 15 Sep 2011: $ 220,091

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