Project Overview
Location: washington, d.c.
client: georgetown day school
discipline summaries
general
construction
mechanical
lighting/electrical
structural
general
construction OVERVIEW
Duration: 28 Months
Budget: $63 Million
Phase 1: 03/01/21 - 05/31/21
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Document Collection and Long Lead Procurement
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Mobilization
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Site Prep
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Excavation and Install of Parking Structure's Slab
Phase 2: 05/31/21 - 06/27/22
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Excavation of Main Structure
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Structural System
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Envelope
Phase 3: 06/27/22 - 01/22/23
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Interior Construction
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Cranes Leave Site
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Construction Signoff for Elevator Use
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Parking Structure Finished
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Turf Field Install
Phase 4: 01/22/23 - 06/16/23
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Finishes
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Site Work
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Clean Up and Punchlist
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Turnover to GDS
Mechanical System Selection
When selecting an HVAC System for the Georgetown Day School, the team determined that to fully understand the system that could be implemented, all possible system types had to be considered. This meant analyzing system families through multiple objectives to obtain project goals. To do this, a design space in Grasshopper was created to implement necessary initial conditions to alter and conclude an ideal design. From the data-informed process, a system combination of 4-Pipe Fan Coil with DOAS and Air-Cooled Chiller with Natural Gas Condensing Boiler was selected.
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4-Pipe FCU with DOAS
The main system used to condition the spaces was a 4-Pipe Fan Coil DOAS system. This was supplied by two 170-ton rotary chillers and two 3,000,000 Btu condensing hydronic boilers. Each fan coil is located in a closet off the corridor to mitigate noise and can be equipped with MERV-13 filters to help combat infectious disease particles.
Energy Consumption
Throughout the design process, Celsius was able to monitor the energy consumption of the Georgetown Day School through Energy Plus on a Grasshopper Interface. This made it possible for the team to add designed systems in like puzzle pieces. At the end of building design, the total site EUI was 34 kBTU/SF/yr. With the 409 MWh/yr PV Generation, the Gross Site EUI was 25 kBTU/SF/yr.
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Lighting Design Scheme
The lighting design scheme for the Georgetown Day School embodies a focus on functionality and learning. Lighting moves are strategically placed to enhance and highlight key building systems, turning the building into a teaching tool for students. In the theatre for example, wall concealed lighting details highlight acoustic panels while an RGB uplight accents the theatre rig.
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Daylighting Design Scheme
The daylighting design scheme was pivotal to the integration with other disciplines across the project. Data-informed and computationally supported decisions combine to deliver a thoughtful and sustainable daylighting delivery system. As seen on the left, translucent toplighting in the Flexible Athletic Space allows for ample lighting, while minimizing glare.
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Electrical Design Scheme
The electrical design for the Georgetown Day School focuses on safety, resiliency and ease of maintenance. A switchboard located adjacent to the parking structure for easy maintainability feeds the power needs across the school. A natural gas generator supports emergency power generation in times of need, creating spaces like the Flexible Athletic Space, which can serve as a refuge during natural disasters.
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structural OVERVIEW
Concrete Design
The primary structural system for the Georgetown Day School is a post-tension one-way slab and beam system. Selected as a result of an in-depth building system study, the one-way system minimizes the number of columns needed while achieving long spans. Concrete shear walls around vertical circulation provide ample lateral resistance and allow for an adaptable floor plate.
Steel Design
To achieve long spans in the flexible athletic space, a steel truss system was selected. An in-depth computationally designed truss system drove the architecture in the space and allowed for integrated improvements in design. Shown is a visualization of the data-informed process, with multiple geometric parameters adjusted to analyze lighting and mechanical metrics, while minimizing structural weight. Braced frames provide lateral resistance and engage students with open structural design. The result is an arched roof on tapered columns that integrates all disciplines.
