Zero Energy Certified

ROSE VILLA – THE OAKS

vital stats

Certification StatusZero Energy Certified
Version of LBC3.1
LocationPortland, OR, USA
TypologyBuilding
Project Area18,170 square meters
Start of OccupancyJanuary 2019
Occupancy TypeResidential Building
Number of Occupants24

project team

OwnerRose Villa Senior Living
Owner RepresentativeBod Judd
ContractorKajima Overseas Asia Pte Ltd (KOA)
ArchitectGreen Hammer
ContractorGreen Hammer
Photo Courtesy of Rose Villa – The Oaks

building systems information

Wall R value and section specificationR30, 2×8 DPC + 1.5″ MW
Roof R valueR53
Floor R valueR16
Windows3-pane Tilt/Turn, U values = 0.14, SHGC = 0.5
Window to Wall Ratio23%
Air infiltration rate and sealing protocol0.9 (ACH-50), tapped and sealed mechanically fastened WRB

Photo Courtesy of Rose Villa – The Oaks

HVAC

The HVAC system consists of an air source heat pump with one unit per dwelling. 1:1 DHP.

VENTILATION

Each building has a heat recovery ventilation unit.

ENERGY PERFORMANCE & EUI

Actual energy use during performance period79,342 kWh
Actual energy produced during performance period85,182 kWh
Net Energy Use-5,840 kWh
EUI14.8 kBTU/sf/yr

Photo Courtesy of Rose Villa – The Oaks

RENEWABLE PRODUCTION SYSTEMS INFORMATION

Panel Array Size71.67 kW
PV Output Per Capacity Nameplate375 W
Panel Quantity180
PV Type and BrandLG Neon
PV Inverter Quantity4
PV LocationRoof and Carport

STORY OF PROJECT

The Oaks Zero Energy Community at Rose Villa is the first community in the Portland senior housing market to achieve Zero Energy Certification; demonstrating that it produces all or more of its own energy needs through on-site renewable energy. The Oaks includes 12 craftsman-style homes built to meet Passive House principles that support health and energy efficiency. Residents will likely have low-to-no energy costs while enjoying comfortable, quiet homes with fresh, filtered air. Each home also features durable, high-quality finishes, modern, energy-efficient appliances and perks such as bicycle storage.

Photo Courtesy of Rose Villa – The Oaks

OCCUPANCY ENGAGEMENT STRATEGY

The occupancy engagement strategy consists of unit-level metering and periodic review with the residents.

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