Central Plant Retro-Commissioning at Boston Logan International Airport IDEA 2015 Annual Conference Session 3C June 30, 2015

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1 Central Plant Retro-Commissioning at Boston Logan International Airport IDEA 2015 Annual Conference Session 3C June 30, 2015 Abbe E. Bjorklund, PE, CEM, LEED AP, CPMP

2 Boston Logan International Airport 20 th Busiest Airport in the US Over 30 Million Passengers/yr Over 361,000 Takeoffs and Landings/year 203 Gates/ Four Terminals

3 kbtu/sqft Case Study: Massport CHP Retro-Commissioning Massachusetts EO 484: Leading by Example Reduce energy intensity (Btu/sf) by 35% by 2020 Reduce greenhouse gases (GHG) by 40% by 2020 Goal #1 - EUI Scenarios LBE Target New Intensity Planned Intensity Underway Intensity 2010+ASHRAE EUI Historic EUI FY04-FY FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 FY15 FY16 FY17 FY18 FY19 FY20

4 Massport Central Heating Plant (CHP) Provides chilled water and steam to airport facilities 385,000 lb/hour heating capacity 15,850 tons cooling capacity Accounts for 50% of Massport s energy/ghgs

5 CHP Retro-Commissioning Investigation Systematic review of operations Identify opportunities to improve performance Field testing Data review and analysis Hydraulic Modeling Investigation Report

6 Efficiency of Consumption Condition Occupancy Energy Systems Efficiency GHG Distribution Efficiency of Delivered Service Efficiency of Production Age Condition Configuration Internal Loads Efficiency GHG Integrated Approach

7 CHP Retro-Commissioning Recommendations Operational Projects Decrease Delta P Setpoints Modify Controls on CHW Pump VFDs HVAC TAB HVAC Controls Testing/ Repair Reset Chilled Water Supply Temperature Operate Electric Chillers

8 Massport CHP Retro-Commissioning CHP Retro-Commissioning Recommendations Capital Projects Bypass Building Pumps Upgrade Plant Metering Address Steam System Losses Install VFDs on Cooling Tower Fans

9 Investigation Report Economics $0.8 million cost $1.1 million/year energy savings 0.8 year payback 30% reduction in CHP energy/ GHGs Projected CHP kbtu Savings 125,404,340 kbtu 1A Projected Savings Remaining CHP Non-CHP

10 Chilled Water System Hydraulic Modeling Convert 3-way valves Open balancing and deny valves Shut down and bypass tertiary pumps Eliminated future deny valve and tertiary pumps $1 million cost savings

11 Total Cost per Ton-Hr Case Study: Massport CHP Retro-Commissioning Chiller Performance $ $ $ $ $ $ $ % 40% 60% 80% 100% 120% Percent of Full Load Tons Ch 1 Ch 6 Ch 4 Ch 5 Operate Electric Chillers Operated steam chillers in summer to load boilers VFDs on FD/ ID fans Successful implementation Renegotiate gas supply contract Over $500,000/year energy cost savings

12 Metering Can t Control What You Can t Measure HTHW, Steam, CHW IT Network Communications Energy Dashboards

13 Reduce Steam System Losses Replaced 77 Steam Traps Standardized With Flanged Connections Maintenance Insulation Repairs

14 Implementation $3.8 million cost $1.2 million/year energy savings 3.3 year payback Removed Terminal E Meters: Steam Traps: Stringent Procurement Requirements 3 Years!

15 Retro-Commissioning Critical Success Factors Motivated Facilities Staff Consulting Team Experienced with Design and Operation Retain Through Implementation Procurement/ Budget Monitoring and Verification Training Ongoing Persistence

16 Questions?

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