Hybrid Life Cycle Assessment of Low, Mid and High-Rise Multi-Family Dwellings

Original article written by : Kimberly Bawden &Eric WilliamsPresented by : Fazle Rabbi Rahik Roll :1301018Supervised by : Dr.Kazi ABM Mohiuddin

Life Cycle Assessment

» Life-cycle assessment (LCA) is a technique to assess environmental impacts associated with all the stages of a product's life

OBJECTIVES Classification of the process

which should be included in the boundary of LCA analysis.

Examination of the total LCE and GWP of a portfolio of 10 low ,mid and high rise multi family dwellings

Examination of the change of the gap in energy use between single and multi family homes by house hold income.

objectives LCA inventory

Process sum

EIO

hybridExploration of effect of

income

Functional unit choice

Methods

1

2

3

Inconsistent choice

consistent choice

Materials contribution

EIO LCA

CED

GWP

ResultAna

lysi

s by

mat

eria

l co

ntrib

utio

nE

cono

mic

allo

catio

n ap

proa

chClassification of the process

Examination of the total

LCE & GWP

Examination of the change

in gap in energy Concept

mapping

Functional Unit Choice

Inconsistent choice Consistent choice

Hybrid approach The method is based on the fundamental equation: ETotal = Ematerials + Econstruction + Eoperation where, Ematerials = (ΣPj·ESCj)/total area of residence Econstruction = (BV·ΣPj·EFj)/total area of residence Eoperation = primary energy of fuels consumed/ total area of residencea

Cumulative Energy Demand

»

WS/W: Wood siding/wood frame;

SCB/WJ: Stucco on concrete block/wood joists;

PCP/RC: Precast concrete panels/reinforced concrete:

PCP/S: Precast concrete panels/steel;

RPC/RC: Ribbed precast concrete

RPC/S: Ribbed precast concrete/steel.

Global Warming Potential (GWP)

WS/W: Wood siding/wood frame;

SCB/WJ: Stucco on concrete block/wood joists;

PCP/RC: Precast concrete panels/reinforced concrete:

PCP/S: Precast concrete panels/steel;

RPC/RC: Ribbed precast concrete

RPC/S: Ribbed precast concrete/steel.

Total life cycle energy for 11-storey multy family dwellings

Total life cycle CED by Income and Housing Type

SF: Single-Family Residence;

k: Thousand US$;

GJ: Gigajoules;

Ave: Average; m2: Square meters.

Conclusion

CED/GWP increase from low to mid to high-rise. A functional unit only including HVAC activities

the total life cycle energy, or CED, is approximately halved for the 11-story multi-family dwelling,

Total life cycle energy of single-family detached homes increases with income more quickly than for multi-family homes.

THANKS!Any questions?