Implementation of an Energy Harvesting System for Powering Thermal Gliders for Long Duration Ocean Research
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1 Implementation of an Energy Harvesting System for Powering Thermal Gliders for Long Duration Ocean Research Clinton D. Haldeman III, Oscar Schofield Center for Ocean Observing Leadership Rutgers, The State University of New Jersey New Brunswick, NJ Douglas C. Webb Teledyne Webb Research Corporation North Falmouth, MA Thomas I. Valdez, Jack A. Jones Jet Propulsion Laboratory California Institute of Technology Pasadena, CA 91109
2 I. Background Slocum Thermal glider to Slocum-TREC Building on success of previous ONR funded project that resulted in 2 thermally propelled gliders Joint project; NASA s JPL & TWRC integrate SOLO-TREC (Sounding Oceanographic Lagrangrian Observer, 2009) and Slocum glider. Rutgers year 2, operational expertise. Testing 15 miles offshore (trim, ballast, etc.) Thomas I. Valdez Power Subsystem Analyst ROCKET SCIENCE!!!
3 Autonomous Platforms buoyancy driven APEX Floats 4 year life Seaglider up to 10 months duration Spray Glider - ~6 months duration Slocum electric glider ~1 year w/ extended energy bay
4 Slocum Thermal glider Slocum electric glider single engine; stepping stone to the thermal Projected endurance 4 years or more Uses Phase Change Material (PCM) to drive oil used for buoyancy control. Duration is limited to ability of primary battery to power hotel load
5 II. Slocum-TREC design difference Solo-TREC Slocum-TREC 2 thermal engines, so more oil available. PCM uses aluminum metal foam to enhance thermal conductivity - thermal response by factor of 50.
6 What can we do with that extra oil?
7 Slocum-TREC Energy Storage Functional System Schematic P HP Control Electronics SW0 BV Hydraulic Motor AXI- SW3 Rectifier SW2 Charge Battery (14.4 to 12.5V) Nominal: 13.2 V Discharge Battery (14.4 to 12.5V) Nominal: 13.2 V + Power Out - LP Motor Driver Speed Control SW4 Electronic Load SW1 Back-up Primary Nominal: 12 V Control DAQ Sense Power Hydrauli c Switch Pressure 2 battery packs; 1 being charged, 1 being discharged (used) Ball Valve Current 7 7
8 Electronics Delivery: Electronics Integration Control Electronics Batteries Slocum Controller (TWR) Energy Storage System Control Electronics (JPL) 8
9 Energy Harvesting Specifics Typical generation cycle seconds Generates 1.8 Wh/Dive, stores 1.7 Wh/Dive; delivers 70 Wh every 80 generation cycles Battery voltage V, an optimal operating range for a variety of scientific sensors Energy can be delivered at power levels as high as 800 W, opening the door to a wide array of other sensors where power levels are a concern Voltage levels correspond to 40-75% state-of-charge (SOC) - optimized to maximize battery cycle life, allowing 10+ years of operation! 90 generation cycles * ~4 hours/dive = ~15 days, Voltages steady
10 III. Testing Tropical Waters Goals Endurance Tests A) Hawaii 2 Slocum-TREC gliders deployed (Lewis and Clark) Lewis never resurfaced (possible large animal interaction?) Clark suffered issue w/ trim mechanism; recovered after 45 days ½ of planned initial endurance test B) St. Thomas, USVI Clark repaired; redeployed Jan 2015 Oil volume issue; necessitated recovery Recovered after 27 days; adjustments made Redeployed for another 68 days; accumulator leak Total of 95 days; but non-consecutive
11 Results What did we learn? A) Energy harvesting/generation/storage system worked incredibly well. Shunting energy, so increased CTD resolution while remnants of Hurricane Danny and then Tropical Storm Erika passed by. Energy budget issue is solved; perhaps bringing biofouling to the forefront B) Differing ballast & flight mechanics/nuances, such as twist C) Latitudinal range of operation still TBD. Or, how much energy can we generate? Electric pump? D) Environmental interaction how to pilot this glider. Buoyancy drive vs. power generation, etc. E) Water Mass Layering / CTD issues
12
13 summed up in 7 lines of text on a website
14 Area of Rapid Intensification (RI) Increase of sustained winds of at least 30 kts in a 24 hour period
15 What We Know High intensity storms destructive; loss of life and property, cause economic damage National Centers for Environmental Prediction (NCEP) mission statement includes delivering climate products protecting life, property, and economic well-being. Real-Time Ocean Forecasting System (RTOFS) to input into hurricane and climate forecast systems It s a data issue or the lack thereof What Can We Do? Working on pushing all Rutgers glider data to Global Telecommunications System (GTS) for model ingestion Provide continual high resolution data needed for assimilation to correct errors in model
16 Subtropical underwater (SUW) significantly deeper than shown in RTOFS
17 What Can We Do? Working on pushing all Rutgers glider data to Global Telecommunications System (GTS) for model ingestion Continual high resolution data needed for assimilation, else errors in model occur What Have We Done? Lagrangian drifters, but only yield a profile every 10 days Buoys, but don t provide profiles
18
19 When zoomed in to surface of temperature profiles, cooling visible as storm passes
20 Strengths of Slocum-TREC become apparent Continual data collection, with a cost that diminishes over lifetime of glider; Iridium satellite communications become primary expense Providing high resolution data in sparsely sampled areas can correct errors in models, leading to better track and intensity forecasts. Examples include Hurricane Irene in NJ, where glider data resulted in a reduced intensity forecast due to bottom boundary layer mixing and surface layer cooling
21 Summary Slocum-TREC next generation of ocean gliders Harvesting thermal energy from the ocean has solved the issue of a limited power budget now on to the next A few minor mechanical issues need addressed, but piloting will still contain a learning curve. Nuances particular to the thermal design and latitudinal limits may pose challenges Providing continual data over an extremely long duration can increase the accuracy of models, ultimately resulting in the preservation of life and property. As Henry Stommel suggests, we need a fleet of about 1,000.
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