quarter ending 11 31 01 task 4 3 1 3 integrated control strategies stone spitler elliott
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Oklahoma State University Geothermal Smart Bridge. Quarterly Progress Report. Quarter ending 11/31/01 Task 4.3.1.3 - Integrated Control Strategies Stone/Spitler/Elliott. Accomplishments. Alternative controller (SC2) developed for the model bridge Bridge deck wetness sensor developed

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quarter ending 11 31 01 task 4 3 1 3 integrated control strategies stone spitler elliott
Oklahoma State University Geothermal Smart Bridge

Quarterly Progress Report

Quarter ending 11/31/01

Task 4.3.1.3 - Integrated Control Strategies

Stone/Spitler/Elliott

accomplishments
Accomplishments
  • Alternative controller (SC2) developed for the model bridge
  • Bridge deck wetness sensor developed
  • Preliminary communications infra-structure plan for Smart Bridge control systems developed
issues driving development of alternative controller
Issues driving development of alternative controller
  • The model bridge heating system uses a single heat-pump and is configured for an ON/OFF controller.
  • The minimum OFF time after the model bridge heat-pump has been engaged is 5 to 20 minutes. This severely limits modulation of heat into the bridge by controlling length of ON cycles.
  • The existing simulated MPC controller optimizes heating time by manipulating loop temperature into the deck and is not easily modified to control the model bridge.
  • Typical warm-up time to 0 0C for the bridge deck is 6-12 hours which is approximately best forecast lead time.
  • The existing MPC controller does not handle the situation where there is no precipitation, the deck is wet, and the deck surface cools below freezing.
  • A controller that implements ON/OFF action with dead-band has been implemented successfully (Smith et. al.) on the model bridge.
sc2 concept
SC2 Concept
  • Based on icing prevention through:
    • Bridge deck wetness prediction
    • Bridge deck wetness sensing
    • Bridge deck temperature control.
  • Uses NWS RUC product
    • Detect threat of a wet bridge surface
      • Precipitation
      • Dew events
      • Up to 12 hours lead-time.
  • Existing ON/OFF controller for temperature control.
  • “leaf wetness” type sensors for deck wetness sensing.
sc2 algorithm
SC2 Algorithm
  • The ON/OFF controller is engaged during the threat of a wet bridge deck surface.
  • Once the threat of a wet bridge deck surface has passed, the ON/OFF controller is allowed to disengage.
  • The ON/OFF controller does not disengage until the bridge deck surface is dry.
  • If the bridge deck surface is wet and the deck temperature falls near freezing, the ON/OFF controller is engaged.
plans for next quarter
Plans for Next Quarter:
  • SC2 will be implemented on the model bridge and monitored during the following quarter.
  • Bridge deck wetness sensor will be tested and performance validated.
  • A strategy will be identified for implementing adaptivity for the Smart Bridge controller.
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