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Plaza at the Park Phase II

Project:

  • 17,844 ft2 Shell Building

Site Location:

  • Bothell, WA

Team:

  • Owner - Business Property Development
  • Architect - Anderson Architects
  • GC - Foushee & Associates
  • HVAC - PSF Mechanical, Inc.
  • Electrical - Valley Electric

HVAC Systems:

  • Variable Air Volume (VAV) systems utilizing one (1) Aaon rooftop packaged unit with 100% outside air economizer
  • Series fan powered VAV boxes with silent mercury contactors
  • Terminal boxes use electric heat at all perimeter and at remaining areas for tempering ventilation air
  • Communicating electronic direct digital controls system with modem remote access
  • Central toilet exhaust system utilizing an in-line ventilator to a roof hood

Energy Saving Strategies:

  • Variable speed (inverter) driven supply fan for Aaon unit results in both energy savings and very accurate control of duct static pressure
  • Direct digital controls provide accurate temperature control, minimizing drift and overshoot: heating signals are ‘pulsed’ to exactly match load requirements

System Benefits/Goals:

  • Series type VAV terminal boxes are utilized throughout the office buildings (both interior and perimeter zones)
  • Benefits include:
    • Constant volume air distribution to the occupied space
    • More accurate temperature control
    • Elimination of stratification in the heating mode
    • Guaranteed delivery of ventilation air to all areas of the building
    • Ideal diffuser selections both for airflow and acoustic performance
    • Constant terminal box fan operation and use of silent mercury contactors eliminates start/stop and contactor noise complaints