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Boiling Water Test Loop University of Idaho

Dakota Nickerson, Kyle Pflueger, Adam Leschber, Andrew Dahlke M.E. Undergrad. Boiling Water Test Loop University of Idaho . Mission Statement.

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Boiling Water Test Loop University of Idaho

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  1. Dakota Nickerson, Kyle Pflueger, Adam Leschber, Andrew Dahlke M.E. Undergrad Boiling Water Test LoopUniversity of Idaho

  2. Mission Statement The purpose of this project is to design and build a scaled boiling water test loop, serving as a test bench that can demonstrate the engineering design concepts of the BWTL as well as verify the boiling regime. Mission Agenda Background Concepts Components Project Learning

  3. What We Want to Accomplish Today • Present: • Background for BWTL Project • Schematic of BWTL • BWTL Test Apparatus • Apparatus Components Mission Agenda Background Concepts Components Project Learning 3

  4. Advanced Test Reactor • Allows Accelerated Testing • Recently Became National Scientific User Facility • Now Public and Private Researchers can use for Nuclear Experiments Mission Agenda Background Concepts Components Project Learning 4

  5. Boiling Water Reactor • Second Most Common Commercial Reactor in United States • Used for Electric Power Production Mission Agenda Background Concepts Components Project Learning 5

  6. Key Concepts of the BWTL • Entire Loop Operatesat the Vapor Pressure of Water • Pump is Used Only For Circulation not for Pressurization • Steady State Operation and Control System • Heat Transfer on Nuclear Fuel Rod Mission Agenda Background Concepts Components Project Learning 6

  7. BWTL Design Concept Heat Exchanger Line heater Line heater TE PE Temp – 320 ± 20 F Press – 90 psia Temp –320 ± 20 F Press – 90 psia Pressure Relief Valve ASME Expansion Tank TE PE TE Prop. Elect. Valve Heater Element 1 3 2 Process Controller TE Pump 4 Phase Angle Controller Temp – 320± 20 F Press – 90 psia Process Controller 4.5 kW Variable TE PE Mission Agenda Background Concepts Components Project Learning 7

  8. Vapor Pressure & Boiling • Vapor Pressure • The Pressure Created Above a Liquid at a Given Temperature – 14.7 psia at 212 °F • Pool Boiling • Liquid at Boiling Temperature • Film Boiling • Layer of Vapor Between Heating Element and Liquid Mission Agenda Background Concepts Components Project Learning 8

  9. Steady State Operation • Pressure/Temperature will be Controlled by Varying the Amount of Cooling Water Circulated Through the Heat Exchanger Mission Agenda Background Concepts Components Project Learning 9

  10. Major BWTL Components Clear Test Section Cartridge Heater Heat Exchanger Line Heaters Expansion Tank Gear Pump Mission Agenda Background Concepts Components Project Learning 10

  11. Major BWTL Components • Line Heaters • 4.5 kW Max Output Water Heaters • Power Output can be Varied between 0 – 100% by means of Phase Angle SCR Power Controllers. Mission Agenda Background Concepts Components Project Learning 11

  12. Major BWTL Components • Heat Exchanger • Shell and Tube • Oversized to Allow Use of Proportional Electrical Valve. • 14.7 ft2 Heat Transfer Area Mission Agenda Background Concepts Components Project Learning 12

  13. Major BWTL Components • Expansion Tank • 8.3 Gallons • Stainless Steel • Built-in Temperature and Pressure Fitting Mission Agenda Background Concepts Components Project Learning 13 13

  14. Major BWTL Components • Gear Pump • Positive Displacement • Variable Flow Rate through Variable RPM of Motor • .5 hp Motor Mission Agenda Background Concepts Components Project Learning 14

  15. Major BWTL Components • Sight Glass • Transparent • Plastic Shell over Glass • Rated to Withstand: • 150 psi • 400 °F Mission Agenda Background Concepts Components Project Learning 15

  16. Major BWTL Components • Cartridge Heater • 3.25 kW/ft Constant Output • 12 in Long x .5 in Diameter Mission Agenda Background Concepts Components Project Learning 16

  17. Final Product

  18. Project Learning • Purchasing From Vendors is Significantly More Difficult with Custom Built Parts • Everything Always Takes Longer than Planned • Communication Between Client and Team is Just as Important as Team Communication. • Having A Definitive Goal and Mission Statement is Key in the Success of a Project. Mission Agenda Background Concepts Components Project Learning 18

  19. Future Work • Installation of Test Section • Testing of System: • Verification of Pressurized Test • Confirmation of Design and Components under Vapor Pressure of Water • Delivery of Final Product Mission Agenda Background Concepts Components Project Learning 19

  20. Questions

  21. Total Cost

  22. Heat Transfer Coefficient • A & delta T can be Measured • Q will be Known From the Electrical Input • H can be Determined Using the Equation Above. Mission Agenda Background Concepts Components Questions 22

  23. Critical Heat Flux 23.6 kW/ft – well above heater output Linear Heat Rate From The Cartridge Heater: 3.25 kW/ft Required exit quality: 14.6% Assuming inlet quality: 7.5% Expected BWTL Flow Rate: 0.51 gallons per minute Thermodynamic Analysis

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