A new way to retrofit old buildings ... from the outside

The discussion focuses on a new approach to retrofitting older multi-family residential buildings to address energy efficiency and emissions reduction. The technology, developed by Hydronic Shell Technologies, involves applying a new insulated facade to the exterior of buildings and embedding HVAC components within these panels. This innovative system, known as Facade Integrated Mechanical Systems (FEMS), aims to retrofit buildings without invasive interior work, making it more appealing for occupants and cost-effective for owners.

David Goldstein, the engineer and co-founder of the startup, highlights the significant challenges existing buildings pose for decarbonization, particularly older, poorly insulated multi-family residences. These structures often lack modern heating systems and insulation, leading to high energy consumption and emissions. Previous retrofit options can be invasive, expensive, and time-consuming, especially in occupied spaces.

The new facade panels act like building blocks, creating an airtight seal while replacing inefficient windows. The central HVAC machinery, generally a heat pump, can be placed away from the living spaces, significantly reducing noise and structural load. The system's four components include the central equipment (heat pump or boiler), ductwork and piping for water distribution, the façade panels (which house the ducts and pipes), and terminal units installed by the windows to provide heating, cooling, and ventilation.

Goldstein explains that these terminal units are fan coil units that circulate either heated or chilled water to regulate indoor temperatures while also filtering and conditioning the air for ventilation. This design addresses indoor air quality issues, particularly critical when sealing a building for thermal efficiency.

A significant benefit of this approach is its flexibility regarding existing heating systems. Building owners can connect the new system to existing boilers or utilize ground-source heat pumps, allowing a phased approach to upgrading building infrastructure. The discussion also emphasizes the importance of ventilation in modernized buildings, ensuring that as structures become more airtight, they still maintain good air quality.

Cost is a central concern with any retrofit project. Goldstein discusses balancing upfront installation costs against long-term savings from reduced energy consumption and lower maintenance costs on facades and HVAC systems. He suggests financing models that could make these projects more feasible for building owners, particularly in light of various regulations and funding opportunities in places like New York City, which focus on aggressive decarbonization goals.

The conversation further explores potential market adoption, indicating that new construction might also benefit from this technology. Integrating HVAC systems into building facades during initial construction could streamline processes and reduce labor costs, creating a more efficient construction model.

Overall, Goldstein expresses optimism about the potential impact of this system on retrofitting strategies for aging facilities, particularly in urban environments. The application promises both ecological benefits and improved living conditions for residents.

In this episode, I geek out with David Goldstein, founder of Hydronic Shell Technologies, about a novel building retrofit technology that wraps old multifamily structures in insulated panels with built-in HVAC systems. Goldstein's approach allows for energy-efficient upgrades without interior disruption, potentially solving a major challenge in building decarbonization. We dive into how the system combines exterior insulation, air sealing, and centralized heat pumps with individual window units to dramatically reduce energy demand and emissions.

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