2019-10-16-PBC-min - Laserfiche WebLink

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S,77SR^�h0 TOWN OF LEXINGTON x ° Permanent Building Committee Q 'zv D Permanent Members APRIL 14'" 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