how to save water with green building construction

www.qatargbc.org

"Green Building Introduction Seminar II “The Interdependence of Fresh Water Use, CO2 Emissions,

Global Warming and their Environmental Impact

QGBC Villa- 26 July 2010- Doha, Qatar

© Ortner Consulting 2010By: Alex Penzias & Nadja Ortner

Environmental Data Qatar

● WaterConsumption perCapita

675l/day

● EnergyConsumptionper Capita

19,466kg(oil) p.a.

● CO2Emissionper Capita

44.4 metrictons p.a.

US 575lEU 200-300l

GCC av.10,601 kg

GCC av. 23.4metric tons

Indoor Environ-mental Quality

Land use

Heating &Cooling

Transportation

Lighting

BuildingOrientation

MaterialSelection

Waterefficiency

Energyefficiency

Of those 0,9% freshwater only 1% is accessible for human use

WORLD WATER DISTRIBUTION

Why reduce your water consumption?

Stop desertification

Save energy

Preserve natureSave money

Conserve NaturalResources

Reduce GHGEmissions

Why reduce your water consumption?

Waterconsumption

Energyconsumption

Co2 emissions

Water vapor

Polar caps melting

Why reduce your water consumption?

Waterconsumption

Energyconsumption

Co2 emissions

Water vaporUpsala Glacier, Argentina, 1928

Upsala Glacier, Argentina, current

Glaciers melting

Why reduce your water consumption?

Waterconsumption

Energyconsumption

Co2 emissions

Water vapor

Desertification

Contribution of various gases to the greenhouse effect:

Interrelationship Water vs. Energy

Source: US Department of Energy, Dec 2006

sewagetreatment

desalination

hydropowergeneration

electricitygeneration

domesticbuildings

Water efficiency in buildings

Overcoming challenges with the most fundamentalresource of our planet by increasing the efficiency ofwater consumption

Defining Green Buildings

Source: USGBC

Design and construction practices that

reduce negative impact of buildings on the environment

safeguard water use and water efficiency

promote energy efficiency and renewable energy

conserve materials and resources

Green buildings can reduce:

Energyuse

CO2emissions

Wateruse Solid

Waste

24% - 50%

33%-39%

70%

40%

Definitions of Water

Grey Water

PotableWater

Black Water

Wastewater generated by taking ashower, dishwashing and doing your

laundry

Wastewater generated by your toilet

Water that comes out of your tap

ProcessWater

Boiler feed water, cooling water forheat exchangers, chillers, etc.

Water Efficiency

Water savings from:

• Water-efficient fixtures and appliances (dual-flush toilet, low-flowfixtures)

• Water-efficient landscaping (drip irrigation, native plants, water sensors)

• Rainwater collection systems (ponds, cisterns)

Benefits include:

• Lower water bills

• Lower volumes of wastewater

• Lower energy costs for hot water

European style home in a humid desert climate:

frdfgkjs

• 1350 square feet• 3 bedrooms• 2 bathrooms• 1 car garage

For 1 acre of built-up area (32 homes) in a humid desertclimate 3338 kilo gallons of water are needed annually

Source: NEAT

Comparison: water efficient house versus conventional house

Source: www.thinkwater.act.gov.au

DeconstructionMaterial Reuse

Construction

Design forConstruction

OccupancyMaintenance

Processing ofRaw Materials

Extraction ofRaw Materials

ENVIRONMENTAL IMPACT

LIFE CYCLEANALYSIS

LIFE CYCLE COST

What you can do to reduce your waterconsumption:

Install low flow faucetsand shower heads

Install aerators forhigher pressure

Reuse/recycle grey andprocess water

Take a shower instead ofa bath

Install moreefficient/dual flush

toilets

Thank you for your attention!

office@ortner-consulting.com

www.ortner-consulting.com