Upping the Ante: Affordable, Multifamily Passive Housing through - - PowerPoint PPT Presentation

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7 th Annual North American Passive House Conference September 27-30, 2012 Denver CO Upping the Ante: Affordable, Multifamily Passive Housing through Integrated Design Dylan Lamar, Intern Architect, CPHC Alex Boetzel, Construction Manager, CPHC

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Upping the Ante: Affordable, Multifamily Passive Housing through Integrated Design

Dylan Lamar, Intern Architect, CPHC Alex Boetzel, Construction Manager, CPHC

7th Annual North American Passive House Conference September 27-30, 2012 Denver CO

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Session Learning Objectives:

  • Learn about current progress on affordable, multifamily

Passive House work in Portland, Oregon

  • Better understand an Integrated Design process in

implementing the Passive House standard to this building type

  • Understand key details of implementing the Passive

House standard on this project 7th Annual North American Passive House Conference September 27-30, 2012 Denver CO

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The Location

6.2 acre parcel in Hillboro, OR

Affordable, Multifamily Passive Housing through Integrated Design

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The Site

General text

master plan

Affordable, Multifamily Passive Housing through Integrated Design

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The Orchards at Orenco

  • Total build out: 150 units in 2‐3 phases.
  • Phase 1: 57 units.
  • The total building size is 56,965 sq ft., 40,968 of

that is for the units and the rest is common, circulation, mechanical and electrical.

  • The unit breakdown is 41‐ 1 Bedrooms and 16‐ 2

Bedrooms for a total of 57 units.

  • Target market: workforce housing

Affordable, Multifamily Passive Housing through Integrated Design

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Affordable Housing

  • Target population: 50% AMI ($32,400 family of 3)
  • Rents approximately $650‐$775
  • $1/sf/month roughly 1/2 of adjacent market rate development
  • Utility Cost 1/2 of County allowance $23‐29/month

Affordable, Multifamily Passive Housing through Integrated Design

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PROJECT TEAM

Client: REACH Community Development Project Manager: Housing Development Center Architect: William Wilson Architects Passivhaus Consultant: Green Hammer Design‐Build MEP Consultants: PAE Consulting Engineers Contractor: Walsh Construction

Affordable, Multifamily Passive Housing through Integrated Design

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INTEGRATED DESIGN PROCESS

  • CPHC brought onto project at Conceptual Design phase

Affordable, Multifamily Passive Housing through Integrated Design

  • Increased cost‐effective decision‐making
  • Allowed collaborative relationships to form before major design decisions were

made (i.e. siting/massing)

  • Sustainable Goal‐Setting Charrette
  • Included project and community stakeholders
  • Highlighted key challenges / proposed some solutions through group discussion
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INTEGRATED DESIGN PROCESS

Affordable, Multifamily Passive Housing through Integrated Design

  • Bi‐weekly meetings held to allow group design process

DESIGN DECISIONS ENERGY MODELING COST ESTIMATING FACILITATED GROUP DISCUSSION

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DESIGN & ENERGY MODELING

  • Early Decisions: Simplify the Problem

Affordable, Multifamily Passive Housing through Integrated Design

  • Elevator, laundry rooms, garbage chutes removed from thermal envelope
  • Minimize envelope assembly variations & complexity
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DESIGN & ENERGY MODELING

Section view of unconditioned spaces

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

  • Early Decisions: Simplify the Problem

Affordable, Multifamily Passive Housing through Integrated Design

  • Recirculating range hoods + HRV boost in kitchen & bathroom
  • Plumbing vents & roof drains aggregated in discrete, insulated “cold stacks”
  • Early Decisions: Occupant Control
  • Thermostat in each unit
  • Ventilation boost
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Schematic Envelope Assembly Investigations

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

  • Fenestration design is uniform since units have single exterior wall
  • Exterior shading varies by orientation
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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

  • Explored climbing vines as

a shading element for east/west orientations

  • No active cooling: passive

night ventilation primary cooling strategy

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

  • Consultant’s biggest challenge: exploring myriad design options and digesting

complexity of the PHPP into clear and succinct deliverables

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

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DESIGN & ENERGY MODELING

Affordable, Multifamily Passive Housing through Integrated Design

  • Energy feedback kiosks to help inform residents…
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What will it cost?

  • Initial estimates (not Passive House): $131/sf
  • versus $150/sf (built to PH standard)
  • Working to VE to $144/sf

Affordable, Multifamily Passive Housing through Integrated Design

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How to pay for it?

  • Incentives: Energy Trust of Oregon
  • incentivizes soft costs and “cost effective” EEMs
  • Superinsulation is not considered cost effective
  • Grants
  • more access to funds through cutting edge of PH and TOD
  • It can be replicated
  • Higher compensation for Low Income Housing Tax Credit
  • more interest by investors because of PH

Affordable, Multifamily Passive Housing through Integrated Design

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How to quantify other financial benefits of PH?

Passive House reduces Vacancy?

  • Industry standard is 93% occupancy
  • Will more comfort result in higher occupancy?
  • An increase by 5% would result in $25,000

additional revenue

  • Simple payback 30 years

Passive House reduces Maintenance?

  • If maintenance cost are reduced by 20%
  • Simple payback will be 20 years

Affordable, Multifamily Passive Housing through Integrated Design

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Air-Tightness in Multifamily Passive House Buildings

Built project in the projects in the Pacific Northwest by Walsh Construction:

  • Sitka Apartments
  • Pearl Family Housing
  • UW Poplar
  • UW Alder

Affordable, Multifamily Passive Housing through Integrated Design

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Sitka Apartments

  • 1.6 ACHnatural
  • 2006

Affordable, Multifamily Passive Housing through Integrated Design

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Pearl Family Housing

  • 0.22 cfm/sf (1.2 ACH50?)
  • 2010

Affordable, Multifamily Passive Housing through Integrated Design

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UW Poplar Hall

  • 0.29 cfm/sf (1.6 ACH50?)
  • 2011

Affordable, Multifamily Passive Housing through Integrated Design

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UW Alder Hall

  • 0.18 cfm/sf (<1 ACH50?)
  • 2012

Affordable, Multifamily Passive Housing through Integrated Design