HomeMy WebLinkAbout2019-10-16-PBC-min S,77SR^�h0 TOWN OF LEXINGTON
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Permanent Members
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Co-Chairman: Jon Himmel & Co-Chairman Dick Perry
fix'"6`� Philip Coleman, Charles Favazzo, Carl Oldenburg,Peter Johnson, Howard Hobbs
Project Specific Members
Hastings Elementary Fire Station Visitors Center LCP
Curt Barrentine Robert Cunha Joel Berman Hank Manz
Andrew Clarke Joseph Sirkovich Peter Kelly Teresa Wilson
October 16,2019
Members Present:Jon Himmel, Dick Perry, Philip Coleman, Charles Favazzo
DPF Staff: Mike Cronin/Director of Public Facilities, Mark Barrett
Others Present: Deepika Sawhney, SC; Chris Schaffner, Green Engineer; Celis Brisbin, Sust. Lex.;
6:00 PM-Meeting was called to order-201 Bedford Street,Room 221
1. Police Proiect Integrated Design Schematic Design Phase meeting with representatives of Sustainable
Lexington
Minutes submitted by Chris Schaffner- The Green Engineer
These meeting notes are from the October 16, 2019 PBC meeting at the Lexington Department of Public
Works in Lexington, MA. The meeting was conducted with respect to the Town of Lexington's sustainability
goals for the new Lexington Police Station.
Overview to Date
A recap of project progress was provided. The project is reaching the end of the SD Phase. Construction is
still scheduled to commence in summer of 2020.
Energy Analysis
The Preliminary Energy Analysis was reviewed, and an updated version was distributed. The report
compares four options. Of these, Option Number 1—Geothermal and Option Number 2 -Air Source VRF
were seen as most desirable. Both show significant energy savings against the ASHRAE Baseline system and a
gas heating option. The report is meant to compare HVAC alternatives and does not include other efficiency
measures such as building envelope improvements or lighting power reductions. The analysis is based on
conceptual design, and will be updated as the project progresses.
Life Cycle Cost Analysis
The Lifecycle Cost Analysis Report was reviewed, and an updated version was distributed. The report
compares three options for HVAC systems. For comparison purposes, the Baseline System uses a gas boiler
and air-cooled chiller. It was compared against two all-electric options. The report showed that the all-
electric options have a lower life-cycle cost than the baseline option, despite a higher first cost.
Several questions were raised about the report, including:
1) Do the carbon emission factors used represent the current mix of electricity in Lexington?
Answer—No, based on eGrid emission factors. Lexington to provide additional information on
energy costs and emission factors to be used in further studies.
2) Would the results change if the costs of renewables are included?
Lexington to provide direction as to how renewables should be figured into life-cycle costing.
201 BEDFORD STREET• LEXINGTON, MASSACHUSETTS 02420
Sustainability Report
The Sustainability Report was reviewed, and an updated version was distributed. The report included a LEED
scorecard showing 61 points; enough for Silver.
The report also included a Net Zero Energy Study, which was discussed further. Either of the all-electric
schemes can be combined with reasonable amounts of solar capacity to achieve Net Zero site energy. It was
noted that the extra solar required to bring the VRF scheme to net zero, compared to the geothermal
scheme, and would cost about$66,000. The additional first cost for the geothermal scheme, (from the
Lifecycle Cost report), would be about$525,000; making VRF the lowest first cost path to Net Zero.
The material Red List was also discussed.The need for an implementation strategy, not just a policy, was
identified. Discussion included how we can document without tying the hands of the project team.The
Town wants to focus on materials that have a direct effect on the building occupants first. An updated
strategy was distributed by TGE. Design team proposed simplifying the process by perhaps focusing on only
CSI Divisions 07, (Thermal and Moisture Protection), and 09 (Finishes). Further discussion is required.
Motion to adjourn was made and seconded: Meeting adjourned at 8:45pm.
PBC Meeting 10.16.19 2