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 l.jpg

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 l.jpg
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


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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.


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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.


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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.




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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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