Central Utility Plant Automation

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Central Utility Plant Automation

• Presented by Mike Conway
• Utility Plant Manager

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Central Utility Plant
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CUP Layout
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Original Automation System

• Original automation system was part of the site
  JCI BAS
• This system provided limited control of equipment
• Opened chiller valves
• Controlled the cooling tower
• Alarmed on various conditions
• Major equipment started/stopped from the field
• Operators had no visual information other than
  text data

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Why Install a New Control System?

• Reduce energy costs
• Connect to recently installed systems
• Increase reliability
• Maintain staffing levels in a more complex
  environment
• Automate reporting and archiving

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Original Project Concept

• The original project appropriation was approved
  as a replacement type project with some
  upgrades

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Final Project Concept

• The project scope evolved as the design of the
  automation system progressed. The project team
  realized that what we put in place would be here
  for approximately 20 years.

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The final project was supported by additional
capital dollars to

• Increase boiler house instrumentation
• Increase chiller plant instrumentation
• Increase cooling tower instrumentation
• Increase electrical instrumentation
• Install new valve actuators
• Install VFDs on all major systems
• Reconfigure the emergency power system

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Accomplishments

• Creation of Energy Central
• Operators can see all critical data real time
• Steam load
• Electrical load
• Electrical production
• Chiller load

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Accomplishments

• Revised Chiller Sequences
• Chiller plant operation revolves around the
  cogeneration system
• During the winter months cogen steam is used for
  heating
• During the shoulder months cogen steam is used
  for process and in absorption chilling
• Summer operational base is one 1500 ton steam and
  one 1500 ton electric chiller

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Accomplishments

• Automatic Peak Shaving
• This site uses its diesel generators to limit
  electrical peak demand
• Concept ties directly to chiller plant operation
• On peak demand days all absorption chillers are
  already running and additional electric chillers
  are staged in
• The diesel generators are used to clip this
  peak demand for approximately 300 hours per year

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Accomplishments

• Increased plant performance through
  instrumentation
• Knowing where the water is
• Troubleshooting of equipment

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