OVERVIEW
THE CHALLENGE
THE SOLUTION
PROJECT PARTNERS
HUDSON SQUARE PROPERTIES
345 HUDSON
345 Hudson, developed by Hudson Square Properties (HSP), serves as a model for sustainable practices by incorporating Nordic design principles of holistic energy recycling and electrification. The 1931, 17-story commercial building currently has a mid-tier energy rating and an aging heating system that runs on fossil fuels.
The Challenge
Almost all older buildings in NYC have their HVAC systems designed that are similar to 345 Hudson or have steam from Con Edison.
Because of its natural gas systems and carbon emissions, 345 Hudson was destined to face recurring Local Law 97 carbon emissions fines starting in 2035.
BUILDING ENERGY GRADE
B
ENERGY USE INTENSITY (EUI)
77.6
YEARLY CARBON EMISSIONS
4,999
TON Co2e / YEAR
Running on two separate systems for heating and cooling, 345 Hudson had steam and cast-iron radiators wrapped around each floor.
Ambient heat was absorbed and released via the rooftop cooling tower, a typical sight in New York City.
Cooling Towers
Condensed Water Loop
Water source tenant DX Cooling Units
The building’s existing linear supply and exhaust infrastructure released ambient heat with potential for re-use to the atmosphere, increasing 345 Hudson’s emissions. This is typical for any high rise in NYC.
HUDSON SQUARE PROPERTIES
345 HUDSON
345 Hudson, owned and currently being repositioned by Hudson Square Properties (HSP), is a model for sustainable practices, incorporating Nordic design principles of holistic energy recycling and electrification and serving as a scalable solution for Local Law 97 compliance.
BEFORE
AFTER
THE SOLUTION
THE CHALLENGE
2022
2023
2024
2025
2026-2029
HSP turned to Arch Energy, Consigli’s energy division, to help develop their decarbonization plan. Consigli is now implementing extensive infrastructure changes that will make 345 Hudson’s decarbonization a reality. And, because HSP is preserving the 100-year-old building, the renovation saves significantly on embodied carbon compared to new construction by reducing the need for new materials and minimizing demolition waste.
Like most older NYC commercial buildings, the 1931, 990,000 sq. ft. 17-story 345 Hudson operated using a more traditional, fossil-fuel-based heating system and condenser water-based cooling system which operated independently from one another. 345 Hudson was projected to face recurring Local Law 97 carbon emissions fines starting in 2035.
$204K
BUILDING ENERGY GRADE
B
ENERGY USE INTENSITY (EUI)
83
YEARLY CARBON EMISSIONS
4,999
TON CO2e PER YEAR
REDUCTION IN ANNUAL EMISSIONS
MINIMUM EUI REDUCTION BY 2035 FROM A 2019 BASELINE
avoided in ANNUAL LL97 fines starting
in 2030
The building’s outside and exhaust air supply is not recovered, increasing 345 Hudson’s emissions. This is typical of most NYC high rises.
Running on two separate systems for heating and cooling, 345 Hudson had steam and cast-iron radiators wrapped around each floor.
A central plant consisting of an air-source heat pumps and adiabatic fluid coolers is installed to supply and reject heat and maintain design temperatures for the ambient loop. 345 Hudson is thermally connected to the neighboring building to leverage its geothermal piles and support shared heating.
Water source heat pumps were installed on four of the tenant floors to convert to hydronic low temperature heating and high temperature cooling.
Mirroring the 2023 tenant floor improvements, the remaining tenant floors are converted from existing systems to water source heat pumps. Instead of retrofitting the entire building at once, the work can be carried out floor-by-floor. This approach is more budget-friendly, offers greater flexibility and minimizes disruption to current tenants. Potential envelope improvements will further increase energy efficiency and reduce emissions.
The central plant is further enhanced with the installation of a dedicated outdoor air system with 90%+ energy recovery. The system also improves fresh air delivery. The central plant is completed and commissioned in 2025.
The installation of an ambient loop hydronic spine allows the building to share and reuse heat between floors. An ambient loop is a high efficiency water-based distribution system with lower supply temperature that shares heat between floors.
PLAN FOR YOUR LEGACY BUILDING
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2
3
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5
Benchmark Your Emissions
Engage Collaborative Partners
Analyze Emissions Data
Reduce, Recover, Electrify
Leverage Available Incentives
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