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Oceanic Thermal Energy Conversions

Oceanic Thermal Energy Conversions. Group Members: Brooks Collins Kirby Little Chris Petys Craig Testa. Problem Statement of Project.

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Oceanic Thermal Energy Conversions

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  1. Oceanic Thermal Energy Conversions Group Members: Brooks Collins Kirby Little Chris Petys Craig Testa

  2. Problem Statement of Project • To create and design an operating Oceanic Thermal Energy Conversion model that employs a closed Rankine Cycle that utilizes ammonia or a comparable refrigerant as the working fluid to illustrate the viability of OTEC power production.

  3. Working Fluid Difficulties • Our previous working fluid, ammonia (NH3) is poisonous at high concentrations and is an irritant to the eyes, nose, and lungs. • Possible replacements for ammonia include Propane (C3H8), Butane (C4H10), or R-22. • When compared to the possible replacements, ammonia is the most thermally efficient.

  4. Turbine Difficulties • Sourcing a turbine • Finding a reasonably sized turbine is difficult due to the fact that many industrial turbines are for extremely large applications. • Limited manufacturers • We could possibly use a reverse driven centrifugal pump as a turbine • Using the turbine side of a small turbocharger is also a possibility

  5. Budget Difficulties • Expensive design with many specialized components and a very limited budget. • Our contacts at Lockheed Martin have expressed their willingness to extend our budget to meet the system requirements. • Due to this budget extension we have modified our design to a more robust and effective design.

  6. Previous Design New Design • Requires • 3 pumps • 2 plate heat exchangers • 2 water tanks cold/hot • 1 turbine • 1 generator • Benefits • much more advanced heat exchangers • will provide forced conduction • will provide more constant temperatures • Requires • 1 pump • 2 heat exchangers • 2 water tanks cold/hot • 1 turbine • 1 generator • Benefits • less pumps • less tubing • cheaper

  7. Previous Design Condenser is placed in a cold tank to cool vapor back into liquid Vapor turns turbine and power is produced with a generator Cycle begins again Working fluid is pumped into evaporator Evaporator is placed in a heated tank to vaporize the working fluid

  8. New Design Condenser cools vapor into liquid using water from a cold tank pumped through it (forced conduction) Vapor turns turbine and power is produced with a generator Cycle begins again Working fluid is pumped into evaporator Evaporator turns the working fluid into vapor using water from a heated tank that is pumped through it (forced conduction)

  9. New Design Schematic

  10. Plate Heat Exchangers • Alfa Laval M6 Plated Heat Exchanger • We must work with Alfa Laval to create a heat exchanger that fits our specific needs. • We can custom order number of plates and heat exchanger size to our heat requirements

  11. Plate Heat Exchanger Fluid Flow

  12. Calculations: Ammonia (R-717)

  13. Future Fall & Spring Schedule DEC M|TU|W|TH|F JAN M|TU|W|TH|F FEB M|TU|W|TH|F MAR M|TU|W|TH|F APR M|TU|W|TH|F NOV M|TU|W|TH|F ORDER PARTS, FINAL DESIGN PACKAGE, SPRING PROPOSALS FINAL DESIGN REVIEW ASSEMBLE AND TEST EACH COMPONENT PROGRESS REPORT MIDPOINT REPORT DIAGNOSE AND CORRECT PROBLEMS BEGIN OPERATIONS MANUALS BEGIN FINAL REPORT OPEN HOUSE ON TIME!

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