BUILDING ENERGY - Fall 2016 - 44


FEATURE: LIFE CYCLE ASSESSMENT

LIFE CYCLE
ASSESSMENT
AT THE
SPEED OF
DESIGN

BY RODERICK BATES
PEER-REVIEWED BY
FRANCES YANG, S.E.

voluntary certifications like ASHRAE and LEED move
the industry toward more energy efficient buildings
and reduce the environmental impacts resulting
from the use of electricity and thermal energy.3 New
standards, such as the United States Green Building
Council's LEED v4, reward designers that use
whole-building LCA via materials and resource
credits that emphasize environmental impacts
throughout a building's life cycle.
Typically, conducting LCAs for buildings and
construction has been time and labor intensive,
and most LCAs are performed after construction
is already complete. The incompatibility of LCA
ll building materials have an
and modeling software led the Philadelphia-based
environmental impact backstory. They
architectural practice KieranTimberlake to develop
begin as raw materials that are mined
Tally®, a software tool that combines environmental
or harvested, processed as feedstocks,
impact data with material attributes. This tool can
transported through complex supply
use engineering and architectural specifications
chains and are ultimately manufactured into
materials for the purpose of constructing a building. and assembly details to produce reports designers
On average, three pounds of resources are consumed can use to analyze material selections. These
reports provide users with life cycle-based
to manufacture one pound of material found in
product information by leveraging the same
a building.1 For example, manufacturing concrete
working environment in which building designs are
has impacts ranging from smog to global carbon
generated. This allows designers to see the impact
emissions created through extracting the raw
of their material selections early, while it is still
materials, mixing and transporting them to the
project site, spraying and/or heating the concrete as feasible to make changes.
it cures, and eventually demolishing and removing
the concrete at the end of the building's life. Adding STARTING WITH EMBODIED ENERGY
Throughout its 30-year history, KieranTimberlake
up these impacts, through a process called Life Cycle
has sought to reduce the environmental impact
Assessment or LCA, one kilogram of
caused by buildings. The firm devotes much of its
3000-psi cast-in-place concrete, over its life cycle,
will release into the environment 0.268 kg of carbon, practice to renovation projects that extend the life
0.00113 kg sulfur dioxide, 0.0000462 kg of nitrogen, of existing buildings. In all of its projects, the firm
0.00000000177 kg of CFC-11, 0.0155 kg of ozone, and selects materials carefully, details buildings for
require the expenditure of 2.2 megajoules of energy.2 longevity, and has even explored novel strategies such
as off-site fabrication and design for disassembly.
Life Cycle Assessment is gaining relevance as
In 2008, while preparing a submission to the
a factor in measuring the complete environmental
Environmental Protection Agency's Lifecycle Building
impacts of buildings as changes to codes and

A

44 * BUILDINGENERGY VOL. 35 NO. 2 | FALL 2016



Table of Contents for the Digital Edition of BUILDING ENERGY - Fall 2016

From the Executive Director and Board Chair
New York City is Transforming Buildings for a Low Carbon Future
Does Electric Grid 2.0 Mean Energy Democracy?
Resiliency for Affordable Multifamily Housing: What We Have Learned and What We Still Need to Know
Break It or Lose It: Thermal Bridging in Rainscreen Systems
My PEI is Better Than Your PEI
Life Cycle Assessment at the Speed of Design
From Theory to Reality: Our Journey Toward Sustainability Building a Net Zero Home
Solar Policy in the Northeast: What’s New, What’s Next?
BuildingEnergy Green Pages
Index to Advertisers / Ad.com
BUILDING ENERGY - Fall 2016 - cover1
BUILDING ENERGY - Fall 2016 - cover2
BUILDING ENERGY - Fall 2016 - 3
BUILDING ENERGY - Fall 2016 - 4
BUILDING ENERGY - Fall 2016 - 5
BUILDING ENERGY - Fall 2016 - From the Executive Director and Board Chair
BUILDING ENERGY - Fall 2016 - 7
BUILDING ENERGY - Fall 2016 - 8
BUILDING ENERGY - Fall 2016 - 9
BUILDING ENERGY - Fall 2016 - New York City is Transforming Buildings for a Low Carbon Future
BUILDING ENERGY - Fall 2016 - 11
BUILDING ENERGY - Fall 2016 - 12
BUILDING ENERGY - Fall 2016 - 13
BUILDING ENERGY - Fall 2016 - 14
BUILDING ENERGY - Fall 2016 - 15
BUILDING ENERGY - Fall 2016 - 16
BUILDING ENERGY - Fall 2016 - 17
BUILDING ENERGY - Fall 2016 - 18
BUILDING ENERGY - Fall 2016 - 19
BUILDING ENERGY - Fall 2016 - Does Electric Grid 2.0 Mean Energy Democracy?
BUILDING ENERGY - Fall 2016 - 21
BUILDING ENERGY - Fall 2016 - 22
BUILDING ENERGY - Fall 2016 - 23
BUILDING ENERGY - Fall 2016 - 24
BUILDING ENERGY - Fall 2016 - 25
BUILDING ENERGY - Fall 2016 - Resiliency for Affordable Multifamily Housing: What We Have Learned and What We Still Need to Know
BUILDING ENERGY - Fall 2016 - 27
BUILDING ENERGY - Fall 2016 - 28
BUILDING ENERGY - Fall 2016 - 29
BUILDING ENERGY - Fall 2016 - 30
BUILDING ENERGY - Fall 2016 - 31
BUILDING ENERGY - Fall 2016 - 32
BUILDING ENERGY - Fall 2016 - 33
BUILDING ENERGY - Fall 2016 - Break It or Lose It: Thermal Bridging in Rainscreen Systems
BUILDING ENERGY - Fall 2016 - 35
BUILDING ENERGY - Fall 2016 - 36
BUILDING ENERGY - Fall 2016 - 37
BUILDING ENERGY - Fall 2016 - 38
BUILDING ENERGY - Fall 2016 - 39
BUILDING ENERGY - Fall 2016 - My PEI is Better Than Your PEI
BUILDING ENERGY - Fall 2016 - 41
BUILDING ENERGY - Fall 2016 - 42
BUILDING ENERGY - Fall 2016 - 43
BUILDING ENERGY - Fall 2016 - Life Cycle Assessment at the Speed of Design
BUILDING ENERGY - Fall 2016 - 45
BUILDING ENERGY - Fall 2016 - 46
BUILDING ENERGY - Fall 2016 - 47
BUILDING ENERGY - Fall 2016 - From Theory to Reality: Our Journey Toward Sustainability Building a Net Zero Home
BUILDING ENERGY - Fall 2016 - 49
BUILDING ENERGY - Fall 2016 - 50
BUILDING ENERGY - Fall 2016 - Solar Policy in the Northeast: What’s New, What’s Next?
BUILDING ENERGY - Fall 2016 - 52
BUILDING ENERGY - Fall 2016 - 53
BUILDING ENERGY - Fall 2016 - BuildingEnergy Green Pages
BUILDING ENERGY - Fall 2016 - 55
BUILDING ENERGY - Fall 2016 - 56
BUILDING ENERGY - Fall 2016 - 57
BUILDING ENERGY - Fall 2016 - 58
BUILDING ENERGY - Fall 2016 - 59
BUILDING ENERGY - Fall 2016 - 60
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BUILDING ENERGY - Fall 2016 - 76
BUILDING ENERGY - Fall 2016 - 77
BUILDING ENERGY - Fall 2016 - 78
BUILDING ENERGY - Fall 2016 - 79
BUILDING ENERGY - Fall 2016 - 80
BUILDING ENERGY - Fall 2016 - Index to Advertisers / Ad.com
BUILDING ENERGY - Fall 2016 - 82
BUILDING ENERGY - Fall 2016 - cover3
BUILDING ENERGY - Fall 2016 - cover4
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