from blueprint to footprint making energy efficient design...

Building Bridges to Net Zero

From Blueprint to Footprint

Making Energy Efficient Design a Reality

Gina Buffone, Director New Construction AEA

Amrit Kaur, Energy Efficiency Engineer AEA

MULTIFAMILY BUILDINGS 2015: BUILDING BRIDGES TO NET ZERO

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Presentation Outline

Introduction

Objectives

Stages from Intake to Operation

Document Review

Construction Management

Conclusion


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Objectives: Predictions vs. Performance

Achieving a whole building approach

Optimal design strategies to reduce energy consumption

What works? What doesn’t?

Challenges: Missing links to efficiency

– Fragmented Sector - Many professionals involved at different stages

– Incomplete detailing

– Lack of education and involvement of stakeholders

– Lack of follow-up

Ensuring design intent is carried out though construction


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Project Stages


OWNERS & DEVELOPERS

ARCHITECTS & ENGINEERS

GENERAL CONTRACTORS

TENANTS & MANAGEMENT

Outreach / Intake

Schematic Design

Design Development


Operations & Maintenance


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Changes vs Flexibility vs Cost


Outreach / Intake SchematicDesign

DesignDevelopment

ConstructionManagement

Operations &Maintenance

Hig

h

IMP

AC

T

Low

Building performance Cost and

disruption

TIME (Source: Solidar, Berlin Germany)


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Document Review


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Document Review

Building a line of Communication

• Architectural Drawings

• MEP Drawings

• Specifications

• Manual J Calculations

• Comcheck Reports

• Submittals

• Construction Schedule

Scope of Work

• Conduct a kickoff meeting

• Email the agenda to the team

• Keep discussion on track

• Everyone must be clear on the next step


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Document Review

Document Review

Envelope

Insulation

Windows

Thermal Bridging

Air Sealing

Lighting

LPD (W/sqft)

Sensors

Heating & DHW

Sizing

Efficiency

Piping

Controls

Appliance

ES Label

Ventilation

Sizing

Efficiency

Controls


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Document Review

Making important choices – Window Types

(Source: www.homepower.com)


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Document Review

Energy Efficient Windows

Frame Material

Spacer Material

Number of Panes

Gas Between

Panes

Glazing

Emissivity

ELEVATION DETAIL PARAMETERS


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Document Review

Key performance Measures

U-factor

Air Leakage

SHGC

Visible Transmittance

Condensation Resistance



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Document Review



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Document Review

Thermal Bridging

Occurs when a highly conductive

material by-passes insulation layer

Thermal Bridges in Buildings:

- Wood framing or steel framing

(studs, plates) in insulated wall

- Concrete slab edge (balcony,

parapet, exposed slab edge)

through a wall

- Windows & installation details

through insulated walls

Energy code compliance

Comfort Implications


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Document Review

Thermal Bridging – Window Detail

BEFORE AFTER

EX

TE

RIO

R

EX

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RIO

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EX

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RIO

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INT

ER

IOR

INT

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IOR

INT

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IOR

BEFORE


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Document Review

Thermal Bridging – Window Detail

BEFORE AFTER


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Document Review

Thermal Bridging – Parapet Detail

EX

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EX

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BEFORE AFTER


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Document Review

Problems:

Comfort

Wear and Tear

Initial & Operating Cost

Why:

Fear of under sizing

Rule of thumb calculation

Energy Improvements

Financial disincentive

Oversized Heating Systems

Why bigger is not always better


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Document Review

Common Mistakes:

Window/Wall area

Insulation levels

Air infiltration rates

The number and type of

occupants

Occupant comfort

preferences



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Document Review

Portfolio of 6 existing

bldgs.

Oversized by 40-60%

Lower total installed

boiler capacity by 2400

MBH

Lower installed cost

Lower operating cost

Increased comfort


Building 1 Building 2 Building 3 Building 4 Building 5 Building 6

Original 1700 1700 1200 1200 1400 600

Revised 1200 1200 800 800 1000 400

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

Bo

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r C

ap

ac

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MB

H)

Boiler Installed Capacity


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Continuous exterior insulation with minimum 2/3

exterior and 1/3 interior

Minimize thermal bridging

Air seal

Exterior Envelope


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Reduce thermal bridging

Insulate window surrounds

Windows


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Thorough Air Sealing

BAD

BAD

GOOD

GOOD

EVERY penetration, seam, and joint

gets sealed (not just what you see)

BAD


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The Devil is in the Details

Importance of Mockups

– Window / Exterior wall

– Apartment unit

Undermining completed work

Proper installations

BAD

GOOD


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Seal ALL sides

Assemble on ground or mastic each piece during assembly

Duct Sealing


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Testing: The Key to Success

Blower door

Duct tightness


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Education

Design Professional Awareness

Contractor Training

- Seeing is believing: building testing

Operations Training

- Design systems with building maintenance staff in

mind and ensure adequate training

Resident Awareness

- Eliminate opening windows and removing faucet air-

rater syndrome


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Follow up

System Commissioning

Benchmarking

Example of benchmarking results in client portfolio


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The Ultimate Goal

Striving for the Greatest Energy Efficiency

– Passive House: 80+% savings on heating

– Net Zero

“Vision without action is merely a dream and action without vision just passes the time, but

vision with action can change the world.” – Joel Barker


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Questions?

Gina Buffone, Director New Construction AEA

Amrit Kaur, Energy Efficiency Engineer AEA

Thank you!

from blueprint to footprint making energy efficient design...

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