2019-06-05-PBC-min - Laserfiche WebLink

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LEED EAp2 and EAc2 Minimum/Optimize Energy Performance The project team has set an energy performance target to reduce energy consumption by at least 30%when compared to the ASHRAE baseline. The ASHRAE version will remain TBD. The new Massachusetts energy code specifies ASHRAE 2016. CES presented their findings in the Mechanical System Options report to the team. Three different options for mechanical systems were analyzed; Option 1 includes geothermal heating, a water source VRF system for heating and cooling, and a DOAS system for ventilation. Option 2 includes air source VRF's, and Option 3 includes a conventional fossil fuel boiler heated system and cooling from a chiller [this is only being studied for baseline information]. CES is working on a Life Cycle Costing Analysis (LCCA)of each option and will provide an update once complete. The team discussed the possibility of mechanical system Option 1. This system, in conjunction with onsite renewable energy production, may make zero net energy possible. A geothermal bore field would need to be installed. Conductance Testing must be done early to determine the size of the bore field. Once the bore field have been burried they require little to no maintenance. o Action item: Town to draft proposal for Conductance Testing. It cannot be scheduled on a Tuesday due to weekly farmers market in the lawn where geothermal bore field would be located. o Action item: CES to continue working on the LCCA of the different systems options. LEED EAp3 and EAc3 Building Level and Advanced Energy Metering The project team intends to explore the LEED v4 criteria for installing whole building energy meters as well as advanced energy meters in order to track energy performance through a building automation system. If done early, the electrical panels can be configured to be in line with the energy end uses that need sub meters. This will allow the project team to purchase fewer sub meters. LEED EAc4: Demand Response The project will explore designing the systems to accommodate a future utility demand response program, as one does not exist yet. The team understands that this credit may not be a good fit for an emergency facility, but the design will still have the ability to reduce demand during peak demand periods. LEED EAc5: Renewable Energy Production The project is exploring an onsite renewable energy system to offset operating energy use by 20%. This may be supplemented with offsite renewable energy production. Renewable energy system may be a solar canopy in the parking area. L Lex 1: Utilize Energy Storage Further discussions on this required. Battery back-up may be used to manage demand but may not meet back-up and emergency power requirements of a public safety facility which is required to be fully operational 24/7. L Lex 2: Net Zero Energy The team discussed net zero energy throughout the meeting and continuously discussed ways to approach this goal. Some sort of fossil fuel use is likely for back-up power, but an all-electric HVAC option is on the table. Project may consider a mix of on-site and off-site options to meet net zero. There needs to be more information here;perhaps in the form f a INDOOR ENVIRONMENTAL QUALITY /Mprehetnsiive lengthy footnote. What is the status of the TGE 8/7/19 product? Wi be mature enough for the Police Station project?" L Lex 6: Toxics The Town of Lexington's goals include selethat protect the health and wellbeing of the building occupants. The Town wants to develop a cpolicy that addresses all chemicals of concern and integrates both the LEED requirements for Low Emitting Materials as well as the Town of Lexington's Red List of materials to avoid. The team understands that following the new policy will be challenging but an important effort for establishing safe building standards. The team also understands that once the work is done to develop an approved list of materials for the police station, future projects may refer to this list. o Action item: TGE to develop a draft Chemicals of Concern and Avoidance Policy(provided on 8/7/19). PBC Meeting 06.05.19 3