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Home My WebLink About2024-02-12-SBC-min (MEP & Sustainability Focus Group) MEETING NOTES d �Illv Meeting Date: February 12, 2024 Project Name: Lexington High School Project Number: Click or tap here to enter text. Subject: MEP and Sustainability Focus Group Meeting Attendees: Present Name Affiliation Present Name Affiliation ✓ Cynthia Arens Sustainable Lexington Committee Chair ✓ David Pinnsonnault Director of Public Works .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... J Susan Barrett Town Transportation Manager Todd Rhodes Sustainable Lexington Vice Chair .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Chris Bouchard Project Engineer ✓ Mark Sandeen Select Board .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Phil Coleman Permanent Building Committee Sophie Shaw Student .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Julie Hackett Superintendent of Schools Nancy Safen Tree Committee .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Wendy Heiger-Bernays Board of Health Bernardo Streithorst Student .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Jan Himmel Permanent Building Committee Chair ✓ Jillian Tung Board of Health .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... J ✓ Lin Jensen Support/Resident Dan Vass Sustainable Lexington Committee .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Vincent Lerow AV Technician Dave WiningerDigital Learning Coach '.. .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... J Tina McBride Support/Resident Lorraine FinneganSMMA-Project Manager .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Asa Mole StudentMatt Rice SMMA-Project Architect ''..... ''.... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ '.. Shawn Newell '.. Assistant Director of Facilities ✓ Martine Dion SMMA-Director of Sustainability .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Glenn Parker Appropriation Committee Chair Andy Oldeman SMMA-Director of Engineering .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Town of Sustainability and Resilience ✓ Anthonyjimenez SMMA-Electrical Engineer Maggie Pcard Officer .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Rachel Rahmlow SMMA-Project Manager for ✓ BriurBlack SMMA-Design Architect Sustainabilit J Vamshi Gooje SMMA-Principal in Charge for Chris Shaffner '.. The Green Engineer Sustainability .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ,/ ✓ Mike Burton Dore+Whittier The Green Engineer .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Christina Dell Angelo Dore+Whittier .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ✓ Rachel Rincon Dore+Whittier Elias Grijalva Dore+Whittier Agenda Description Item 1. Introduction: Refer to attendees list. 2. Please refer to attached presentation for meeting materials. SMMA reviews theirpresentation: Verirneaint I Massachusetts �AIVw M(.da)reandW/atl iit....ierr„rrsm�n Givens&Proposed Additional Goals Givens •MA Specialized Energy Stretch Code •Lexington IDP •LEEDv4 Gold Certification •Net Zero Energy(NZE) and EUI 25 • Solar PV Systems/Battery Storage • SITES Certification-Gold Proposed Additional Goal •Net Positive Energy •Microgrid •EV Charging for Buses and electric bicycles •LEED Platinum Certification •Enhanced Ventilation/Air Quality: • 600 PPM(CO2 monitoring) • Aircuity(VOC monitoring) Specialized Energy Stretch Code •Robust Building Enclosure •Efficient MEP Systems LEEDv4 Gold Certification and Lexington IDP(Integrated Design Policy) • Sustainable Sites •Water Efficiency •Energy and Renewables •Healthy/Low Carbon Materials •Indoor Environmental Quality •Resiliency/Healthfulness Topics of Discussion 1.Net Zero Energy and Renewable Energy 2. Climate Preparedness and Adaptability 3.MEP Systems 4. Sustainable Transportation and Electrification of Transportation 5. General sustainability and MEP design planning 6. Sustainable Materials and Healthfulness [IAQ/IEQ] 7. Sustainable Sites 8.Environmental Literacy Energy •High-level context about net zero energy implications •—70%reduction in EUI from existing facility to proposed facility o 104 EUI-->25 EUI •Can be cost-neutral if not better than existing • Solar PV System Preliminary Assessment—3.4 MW o Based on estimated design roof and parking area o Gives us a sense of what's feasible C. Shaffner: has any contact been made with Mass save yet?The earlier we contact,the more money we are likely to get.Yes C.Arens:It's not net metering,we're offsetting the full cost of electricity.Are you still assuming net metering credits?It's still very high level,we'll dive in more in the next phases Page 2 of 7 Would you be willing to share the assumptions to get that? M. Sandeen:As we start to build,plug loads start to be a higher percentage of building loads. Can you elaborate on what we can do to manage plug loads? •We want to discuss with community •Try to push to 70% •Monitoring is also something we want to discuss o Need data from the curriculum •Occupant education/behavior modification to try to get everyone to understand the importance of plug load consumption •Can gamify it,put in metering for competition although it's very expensive Energy cost per square foot are low,Eversource has raised peak demand/delivery charges •Going to be closer to. 1.2M for facility Personal feedback is we should do an all-electric kitchen 2%EV charging is LEED standard,Lexington bylaw is higher than that •Code requires more anyway,Lexington zoning policy will dictate Looking forward to hearing how we address embodied carbon ??: Do you use a software as part of standard practice to assess the tradeoffs-we use Equest Would that incorporate incentives?- software mostly looks at energy savings Lifecycle costing-use output of software D.Voss: in terms of energy use estimate,doesn't include EV charging? •EV buses are an additional goal but not given,did not include in the analysis EV charging for cars will be part of bylaw Do you have any examples or case studies to help estimate load?For the vehicles,we've done it for other projects,not for buses •Would suggest acknowledging buses as an add on and vehicles need to be included Can you describe how you take this 3.4 MW and represent that on the plan from a siding standpoint? M.Dione:Right now we don't have a design yet,we looked at concepts that we had presented at the interview(3-stoiy and 4-story)and looked at what that meant in terms of roof area. •225,000 SF roof, 167,500 SF Parking area •We stayed conservative with numbers because we don't have siteibuilding design yet •To get to Net Zero energy we're going to need a combination of roof and parking canopies C. Shaffner: •Code requirement is 10%is EV ready • Building energy consumption separate from EV • What are you going to be charging for electricity is important D.Voss: The moment we start making drawings we should show the equivalent of 3.4 MW of solar •The expectation of the community is that we have 3.4 MW of solar, so it needs to be incorporated into the site plan We have to have a degree of charging behind the meter and behind the solar There is a capacity to charge vehicles ***Need to have EV bundled into overall load Mechanical,Electrical,Plumbing Page 3 of 7 System Design Considerations •All electric •Best system for intended building use Load Calculations •Critical for understanding what incentives we can receive Life Cycle Cost Analysis Systems that will last the life of the building •Typically,doesn't last the full 50 years Desire for 24/7 HVAC and Humidity Control Leak detection and valve shutoff to mitigate loss •Use flow meters •Automatic control valves Supplemental backup for HVAC Lessons learned from 2-pipe system • We typically don't like to implement,we go for 4 pipe systems Implementing simultaneous heating and cooling •Each zone will provide either heating or cooling Higher electrical load in theatre spaces •We will look into this Ventilation Goals • 600 PPM c Carbon dioxide in the air •Minimum air change rate of 3ACH(air changes per hour) Geothermal Overview •Open loop vs closed loop o Open loop: deeper wells,less wells,can have lower reliability o Closed loop: shallower boreholes,more wells, less maintenance risk •Incentives available for both •Great to serve internal systems withing school How many wells will be required? •Open loop—I Os •Closed loop—100s Heat Pumps Overview Metering of Services • Utility metered • Water metered •Battery storage is separately metered • Submetering throughout school ***We will meter as much as we possibly can to track for incentives Integrations of Automation systems • Security •HVAC Page 4 of 7 •Lighting •Fire Alarm •Other c Any big load for the building will integrate back into the building Electric Vehicle Charging Stations Level 3 • Space required to have infrastructure for level 3 charging is a trade off •We haven't calculated buses into Net Zero goals • 300 KW bus would take—2 hours to charge o A lot of solar panels to offset that o Could require a separate utility line Level 2 •LEED requires 2% • Infrastructure for future installations Level 1 •Flexible charging options Questions: What is fleet charging at the school and what is community charging at the school Currently there could easily be 15-17 fleet EV on top of faculty and student charging Comment about submetering,we have to understand water metering systems in the town,how do we incorporate towns systems 600 PPM,what's the design criteria during winter vs summer •We are designing to ASHRAE code C. Shaffner: I hope you not seriously considering open loop,we don't want it •Its not preferred What is demolition doing to reaching 25 EUI? •We would take all into consideration when doing lifecycle calculations •Health of the building takes priority over efficiency •750 is most stringent as a benchmark •This is a recommendation that we will need to make in meeting#3 C.Arens: •Mention about ventilation and air quality,heat recovery,energy recovery,ventilation helps quite a lot with a lot of things we're talking about here. •Lexington IDP says it's an all-electric building,generators aside,including kitchen Pricing Chart feedback •Pricing should include considerations of battery storage paired with solar behind meter to lower costs • Renewable energy credits that will lower ongoing cost of energy •Be clear about incentives and rebates • What do you expect o Number would be much higher if building would be fully Aced •Make it clear that we're paying very little for a very uncomfortable/unhealthy building right now c There's may other factors that come into the cost Do you have a sense of the 25 EUI target what is the relative proportion of heating load vs cooling load? We will know that better once we start energy model M. Sandeen: Load analysis in future PSR what is the time frame for PSR?June of this year Page 5 of 7 The earlier we can get to its similarity to hastings the better SACH is absolute minimum,hope to put up a larger number If we're monitoring everything were going to be swamped with data • Should give them smart monitoring •Is it possible that smart monitoring data show trends T.McBride In terins of maximizing solar,hoping that when we consider adding solar we should also consider wall-mounted solar panels similar to alewife J.Himmel: 2 reports that SMMA has in draft •Existing conditions talks about how poor existing systems are •Integration of rebates and incentives and a design o OPM has created a draft schedule and there happens to be a 45 day activity at beginning of PSR o Seems like first time we're actually beginning to look at options o June is the appropriate time to start talking about the complexity of what is normally planned and incentives •An opportune time to start getting involved in conversations Healthfulness embodied Carbon • Majority of embodied carbon lives in the building structure •How does this impact decisions were making when designing a building o Mass timber over concrete/steal • Opportunity to reduce embodied carbon in structure • Construction efficiency, prefabricated •Reduce construction waste •Deconstruct ability •Improving the experience of occupants Healthy material decisions •Minimizing exposure to hazards •Light and quality views • Air quality •Thermal health •Acoustics SMMA Red List Analysis Precedent Material Assessment tiers 1.LEED 2. Targeted Products 3.Division 9 Focus 4.Division 9&beyond Biophilia •Access to natural materials/nature •How do you create connection to place •Transitional spaces Page 6 of 7 Questions: N. Sofen: as you mentioned what materials students will be in contact with, staff are also exposed to materials and there exposure is much higher C.Arens Cost will become a factor when considering materials • Smaller it is the less environmental impact it will have •We need to always look at optimizing space so we are meeting the needs we have an not overbuilding M. Sandeen: Red List •Focus on how red list products might affect the health of people not in building • Severe health problems for manufacturers and downstream of disposal Refrigerants •new equipment have global warming potential S.Barret: •Regarding electric school buses, it's important to keep in mind the right balance of school buses vs public buses,vs walking/biking o Start taking a deep look at recommendations and planning for that o Number of buses right now is not the right number,there is a better way to balance things Next Steps SMMA will formulate draft recommendations to review and discuss at meeting#3 •We will send out a spreadsheet in advance L.Jensen: hoping for Net Positive,room for adding more solar panels.How much flexibility could there be?We can look at 10-20%will be related to bus charging decisions. 3. Close The next site, safety and security focus group meeting will be held on April 3,2024 3:30-5:30pm.Estabrook Hall,Cary Memorial Building. Sincerely, IG) IRIIE °u..WI1III III"'1"Tlllllfiillf Christina Dell Angelo Project Manager Cc:Attendees, File The above is my summation of our meeting. If you have any additions and/or corrections, please contact me for incorporation into these minutes. Page 7 of 7