R-951 PASSIVE HOUSE RESIDENCES

The R-951 Residence is a multifamily building with 3 new condominium units developed for sale. 

Certified under the Passive House standard, the super-insulated 5600SF building serves as a model for energy efficiency, excellent indoor air quality, and superior thermal comfort.

Goals.  The developer targeted Passive House certification and net zero capable performance as a market differentiator, successfully selling two of the units before construction was even complete.

Solution.  The resulting building with three dwelling units includes a high performance building enclosure, design for passive solar gain, very high efficiency mechanical systems, and grid-tied photovoltaics. These performance attributes helped contribute to both media and buyer appeal.

Enclosure.  The super-insulated air tight building enclosure includes an insulated concrete form wall system that provides continuous insulation yielding an R-50. An R-50 roof assembly combines mineral wool in the cavity and 5” continuous rigid insulation on top of the roof deck. R-20 is under the concrete floor slab with R-33 on the foundation walls, paired with building details to mitigate all thermal bridging. High performance U-0.14 triple pane windows/doors offer a SHGC-glass of 0.50 to capture the sun's energy. Particular care was paid to maintaining a continuous air barrier, yielding a final infiltration rate of only 0.56ACH50.

Systems.  Ducted air source heat pumps provide space conditioning, including heating, cooling, and dehumidifcation. A Zehnder Comfoair ERV completes the package with highly efficient ventilation and energy recovery. Domestic hot water is supplied in each unit by a heat pump hot water heater. 

Renewables.  On the roof a grid tied 4.5kW photovoltaic system for each unit turns the electric meter backwards to offset energy consumption.

 

 

 

SERVICES: CONSULTING PROJECT

- PaSsive House Consulting

- Mechanical Design

CERTIFICATION

Certified Passive House

PUBLICATIONS & AWARDS

New York Passive House 2015
iPHA Database
2016 Building Brooklyn Award
2015 AIA COTE Award
Dwell
NYSERDA Trailblazer Award 2015
PHIUS Multifamily Building Award

PERFORMANCE DATA

pEUI: 10.2kBtu/sf/yr
Air Leakage: 0.56ACH50
Better Than Code: 80%
Heat Demand  4.75 kBTU/(ft2yr)
Air Tightness  0.56 ACH50
Primary Energy  33.3 kBTU/(ft2yr)
Cooling Demand  3.40 kBTU/(ft2yr)
Heat Load  3.40 kBTU/(ft2)
Cooling Load  2.74 kBTU/(ft2)


CONSTRUCTION

Walls/Roof/Foundation
ICF Walls
Steel/Concrete roof  
Steel/Concrete basement foundation
Windows/Doors
U Value: 0.14
Insulation
Mineral wool, EPS, and polyiso
R20 Slab
R50 Above Grade Walls
R33 Below Grade Walls
R50 Roof


MECHANICAL

Heating/Cooling
Ducted air source heat pump (2.5 COP)
Ventilation
ERV (84% efficiency, 0.49 W/cfm)
Hot Water
Heat Pump Hot Water Heaters

TEAM

Paul Castrucci Architect
Architecture, Visualizations, Photos
ZeroEnergy Design
Passive House Consultant
Mechanical Designer