DDC Summer Intern Presentation: Harlem Courthouse Energy Audit

On August 4th, 2022, DDC college intern Aaron Schmitz presented an energy audit of the Harlem Courthouse to DDC and DCAS professional staff. Aaron, a member of the class of 2023 at Cooper Union, is studying mechanical engineering and computer science. During his DDC internship he worked under the guidance of Public Buildings Courts Unit Deputy Program Director Adele Finer.

Aaron presented an overview of an energy audit for the Harlem Courthouse at 170 East 121st Street. The presentation included an analysis of existing building systems and energy usage as well as an analysis of energy conservation methods (EMC’s) to improve efficiency of the building and reduce carbon emissions. Aaron explained the sustainability goals set by the City of New York in One NYC 2050, which includes reducing greenhouse gas emissions 40% by 2025, 50% by 2030, and 80% by 2050. He noted that buildings account for two thirds of greenhouse gas emissions and that to meet those goals it is recommended that there be greater use of grid electricity instead of gas or other fuels that will eventually be completely generated from cleaner energy sources.

Aaron’s research entailed conducting a preliminary energy-use analysis of the building characteristics. The 25,700 square foot structure has 6 floors and a basement. On weekdays, it is occupied approximately 10 hours per day. Spaces of the building not currently in use include a jail, a 2nd floor courtroom, parts of the basement, an apartment, and an attic. Aaron explained that the building has an existing steam distribution heating system that consists of an operable gas-fired boiler that has been retrofitted to use #2 B-5 biofuel, and an inefficient hybrid one and two-pipe steam system, along with 41 Window AC units.

Aaron analyzed the structure’s existing use irregularities and identified low cost and capital improvements, estimated savings from capital improvements and provided recommendations and detailed cost estimates. The Courthouse was constructed in 1891 and was Landmarked. Any exterior changes require Landmark Preservation Commission approval. The structure has an interior wood frame, and the exterior is masonry. Current projects include façade and roof restoration, fire alarm and new sprinkler system. DCAS DEM has identified the courthouse as a prime opportunity to convert to an electrified HVAC system. After extensive research and examination of the problems facing the courthouse, Aaron proposed several energy conservation methods (ECM’s), including:

• Replacing existing old double pane windows with modern insulated glass units
• Replacing damaged roof and attic insulation and ensuring the attic space is air-sealed
• Replacing both the boiler and window air conditioning units with modern multi-split VRF system
• Replacing the existing steam system with hot water hydronic heating
• Using high efficiency geothermal energy as a complimentary system
• Implementing automated lighting control systems
• Replacing existing lights with modern LED’s
• Retrofitting the existing steam system to prolong lifespan

Deputy Commissioner for Community Partnerships and STEAM Initiatives Lee Llambelis stated, “Aaron’s impressive research identified the long-term conservation goals of the City, focusing on the critical importance of sustainability, and the need to convert to clean energy. Internships expose students to real-life situations and connect them to professionals who can mentor them and help to guide their future careers.”

Public Buildings Courts Unit Deputy Program Director Adele Finer stated, “Aaron’s Energy Audit presentation was the culmination of many weeks of hard work, not only collecting and analyzing data, but also coordinating with DCAS' Department of Energy Management and liaising with other key contacts within and outside of DDC. We've learned that it's critical to continue working across DDC, as well as with allied City agencies, to gain a comprehensive understanding of our public buildings’ existing conditions, available opportunities, and potential risks. This helps us achieve the best possible solutions for each project, every portfolio, and for the City's future needs. It was my great pleasure to act as Aaron Schmitz’s mentor during his 2022 summer internship. Aaron shows great promise as a future leader in the building and construction industry. I wish him and the rest of DDC’s summer interns the best of luck with all their educational and career pursuits.”

About the NYC Department of Design and Construction
The Department of Design and Construction is the City’s primary capital construction project manager. In supporting Mayor Adams’ long-term vision of growth, sustainability, resiliency, equity and healthy living, DDC provides communities with new or renovated public buildings such as firehouses, libraries, police precincts, and new or upgraded roads, sewers and water mains in all five boroughs. To manage this $15.5 billion portfolio, DDC partners with other City agencies, architects and consultants, whose experience bring efficient, innovative and environmentally conscious design and construction strategies to City projects. For more information, please visit nyc.gov/ddc.