Mechanical Energy Conservation
Stage 3
C800658
Seattle-Tacoma
International Airport
1
Item No. ____4e_supp_____
Meeting Date: July 25, 2017
Port Legacy of
Energy Conservation
• Airport completed over 50 conservation
projects since 2001
• Cumulatively, projects reduce
– ~20% energy
– ~3,000 metric tons/year GHG
– Annual energy bill by $1.9M (21%)
• Stage 1 Mechanical (2008)
• Stage 2 Mechanical (2014)
Long-term savings from early conservation projects
Stage 3: Conservation Measures
1. Improve chilled water production and distribution
network
2. Demand based ventilation
3. Air curtains
4. HVAC constant volume (CV) to variable air (VAV) box in
Main Terminal
5. Insulation
6. Metering
Conservation measures reduce both electricity and natural gas
3
Stage 3: Main Terminal Door Air Curtains
• Install at 27 doors to Main Terminal
• Reduces conditioned air loss to outdoors with High Velocity Air
Curtains
4
Example Unit – Sky Bridge 6
Infrared Heat Loss Image Normal Color Image
Stage 3: Sustainability Benefits
• Contributes to two Century Agenda
objectives
– Reduces energy
• 0.4% reduction in total electricity use
• 6.1% reduction in natural gas needed to heat
Airport terminal
– Reduces 839 metric tons of carbon/year
• Reduces reliance on hydropower
• Increases energy resiliency
Stage 3 advances our Century Agenda objectives
5
Financial Return
Project justification based on sustainability benefits, not financial return
6
Energy
Rate
Assumptions
Internal Rate
of Return
(IRR)
Net Present Value
(NPV)
Renewable Energy
Rates
-0.3% -$3.7M
Current/Historical
Energy Rates
-6% to -7% -$5.2 to -$5.5M
Budget and Schedule
Request is $6.8M
7
Request Total
Project
Design
$1.5M $1.8M
Construction
$5.3M $5.3M
Total
$6.8M $7.1M
Schedule
• 2018 Q3 - Complete Design
• 2018 Q3 – Start Construction
• 2019 Q3 – In use
Questions?
8
