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3 PS62R NYC s First Net Zero Energy School (and one of the first in the World)
4 What is Net Zero? Our Definition : The building will produce (on site) as much energy (kwh) as it consumes. On an annual basis Still connected to the Grid (Electric and Gas) NREL Definition of Net Zero
5 MEP Summary Generation PV and Wind Turbine (Electricity) Geo-exchange (Well System HVAC, CHW & HW) Solar Thermal (Hot Water) Distribution (HVAC) HW (Interaction with Domestic) Non Assembly Space Assembly Space Controls / Metering Water What we did What did NOT do
6 Photovoltaic Electric Generation PV cells located on roof, façade and canopy Array Size: KW Total Number of Panels: 1941 Panel Used: Sun Power E20 20% efficient 96 cell and 72 cell panels. Inverters: 10 kw and 12 kw inverters mounted near the panels to minimize DC system losses. Predicted Annual Production: 667,308 kwh Predicted Annual Building Consumption: 655,885 kwh
7 HVAC Generation Geothermal: Closed Loop Geoexchange Well System Modular Water-to-Water Heat Pumps Two Pipe Glycol Loop for rooftop units Four Pipe Water Loop for Building terminal units (Displacement Induction Units, FCUs, UH) Braised Plate Heat Exchanger
8 Geothermal System 80 Vertical Wells (420 deep, to bedrock) Spaced 15 on center Variable flow Well Water Pumps 20% Glycol Well Water Loop
9 Solar Thermal HW Generation Flat Plate Solar Thermal Collectors Collector Area ~ 1,100 SF Dual Storage Tanks, 650 gal each (Solar (pre-heat) + DHW (primary)) Condensing Water Heater Back-up Solar fraction ~ 86% of total DHW production
10 Service HW and Heating HW
11 Service HW and Heating HW Solar Tank tied to Building Heating System (heat building with solar energy when not needed for Domestic) Boiler can back up Building Heating system Domestic / Service HW Building Heating HW
12 HVAC Systems Overview: Distribution DOAS System Gymatorium Unit Cafeteria Unit
13 HVAC Systems Overview Distribution: Non-Assembly Spaces Variable Volume - Dedicated Outdoor Air System (DOAS) for non assembly areas ventilation air; includes energy recovery wheel, HW/CHW coil, and Desiccant Wheel CO2/Aircuity system varies OA flow to space Perimeter Displacemennt Induction Units in all classroom and non-assembly perimeter areas (with HW and CHW coil), air is delivered through perimeter unit, HW/CHW coil adds supplemental heating or cooling dependant on season and load (similar to chilled beams) FCUs for non-assembly spaces, without perimeter glass. DOAS provides OA, FCU cycles to provide supplemental heating/cooling
14 Classroom Conditioning Occupied Supply Code Required Ventilation Air Unoccupied Supply MinimalVentilation Air (ASHRAE cfm/sf)
15 Classroom Conditioning Basics: 64 F DB / 43 F DB SAT Latent Load is met with Dry Air from Semco Pinnacle Provide only Ventilation Air that is required Minimize any Over Cooling / Over Heating Minimize Energy Needed for Classroom HVAC
16 HVAC Systems Overview Distribution: Assembly Spaces Gymatorium: One VAV Rooftop unit for Gymnatorium; includes energy recovery wheel and HW/CHW coil CO2/Aircuity control quantity of OA Cafeteria: One VAV Rooftop unit for Cafeteria; includes energy recovery wheel and HW/CHW coil CO2/Aircuity control quantity of OA
17 Controls: LonWorks BMS for entire building (all MEP) Detailed sub-metering on major building end uses (lighting, HVAC, Domestic HW, etc.); through BMS and/or Dashboard system Detailed sub-metering on sub sets of energy usage in building (classroom light, plug loads, etc.), reporting back to a building dashboard system
18 Water (what we did do) Water Efficient Landscaping (GSG credit W1.1): No permanent irrigation (hand watering, etc.) Native/Adaptive plants 51% reduction in water use for irrigation NOTE: GSG = SCA Green School Guide = LEED equivalent
19 Water (what we did do) Water Use Reduction (GSG credit W2.1, 2.2, 2.3): Achieve 34% Reduction in Potable Water use (LEEDv3 requirements).
20 Water (what we did NOT do) Storm Water Reuse Grey Water / Black Water Treatment Why? = ENERGY Pumps, treatment systems, etc Require Energy Focus of the project was Net Zero Energy, so Water saving measures that negatively impacted energy use took a back seat.
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