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1111 3rd Ave ATS Project

1111 3rd Ave

Location: Seattle, WA

Diagram of energy savings for 1111 3rd AveWith 34 Stories and more than 580,000 square feet, 1111 Third Avenue is an icon of the Seattle Skyline. This high profile building also had a high energy profile. The building owner and property manager partnered with ATS as their energy services professional to increase building efficiency. ATS developed a three-year energy conservation plan inclusive of capital efficiency projects and operational optimization measures.

Seattle City Light Pay for Performance

ATS was one of three companies chosen to be part of Seattle City Light’s (SCL) Pay for Performance (PfP) program. PfP was a three-year pilot program designed to provide energy efficiency incentives while ensuring projects deliver energy savings year over year. PfP required monthly performance verification by comparing the building’s energy consumption on a 15 minute interval basis to a baseline energy model with adjustments for weather and other building variables. To manage the PfP program, 1111 Third Avenue turned to ATS’s Energy Group.

Energy Conservation Measures

Floor Isolation Dampers

Supply air isolation control dampers installed to eliminate conditioned air delivered to unoccupied floors.

High Efficiency Chiller

Aging 550 ton chiller replaced with new high efficiency chiller.  New high efficiency chiller used as first stage of chilled water cooling.

AHU VFDs

Variable frequency drives added to 12 AHU variable-pitch Joy axial fans—1,060 total HP.

Variable Flow Plant Mods

1,100 ton chilled water plant modified from a constant flow to a variable flow system.

Optimized Plant Sequences

Optimized CHW variable flow, CHW reset, CW reset, and cooling tower control sequences implemented.

Garage Lighting Upgrades

Garage lighting replaced with high efficiency lamps and occupancy sensors added to perimeter lights.

 

Savings Details

Since ATS began implementing energy conservation measures at 1111 Third Avenue the energy consumption has dropped considerably, despite a 26% occupancy increase. 1111 Third Avenue now enjoys a smaller ecological impact and greater ongoing financial savings.

Download Full Case Study

 

 

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