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New ecology, inc. July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007...
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July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007 new ecology, inc. Achieving Sustainable Rehabilitation Lauren Baumann Senior Associate New Ecology, Inc. Cambridge, MA The Role of Retrofits and Strategies for Reducing Energy Use in Existing Affordable Housing Green Homes and Sustainable Communities July 19, 2007
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Transcript of New ecology, inc. July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007...
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
Achieving Sustainable
Rehabilitation
Lauren BaumannSenior Associate
New Ecology, Inc. Cambridge, MA
The Role of Retrofits and Strategies for Reducing Energy Use in Existing
Affordable Housing
Green Homes and Sustainable Communities July 19, 2007
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits/Rehabilitations
They are merging areas on the spectrum of existing building improvement
Retrofit-------------------------------Rehabilitation
* Extensive Retrofit versus Slight Rehabilitation?
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits/Rehabilitations
Why are Retrofits and Rehabilitations Important?
• Environmental Impacts– Using existing structures saves natural resources
– Using existing structures prevents green space development
– Provides an opportunity for remediation of polluted sites
– Existing structures are generally in proximity of amenities
– Improvements in efficiency reduce the negative environmental impacts of energy use and global climate change
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits/Rehabilitations
Why are Retrofits and Rehabilitations Important?
• Community Impacts– Can contribute to the revitalization of depressed communities
• Economic Impacts– Can reduce construction costs because of existing infrastructure
– Will reduce operating costs if rehabilitation or retrofit is done with an eye toward energy and water efficiency
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits/Rehabs
Why YOU should care about energy efficiency retrofits:
• Volatility Avoidance – Energy costs continue to escalate, your budgets don’t.
• Risk Avoidance – What is in the regulatory pipeline? Can you afford not to plan for it?
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits: What is possible?
• In most buildings, energy use can be reduced 5-40%
Inefficient Equipment:
AppliancesLighting
Water HeatersFurnaces/
BoilersAir
Conditioners
Inefficiencies Related To:
Reducing first costs(value? engineering)Tech. improvements
Cost reductionsNew economics w/ rising energy
costs
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits: DIY
Become Friends with the Bills and Spreadsheets!
Water: Gal/Per/DayDomestic Hot Water: Average
Therms/MonthSpace Heating: BTU/Sq. Ft./HDDElectric: Average kWh a day/month (per
sq. ft.)
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits: DIY
Building Inventory
– Water Consuming Appliances?– Envelope?
– Mechanicals?– Electrical Appliances and Systems?
Become Friends with Your Maintenance Staff/Property
Management Company!
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits: DIY
Find the Opportunities!
Where do high use and consumption correspond with inefficient systems?
What are the economics of replacement?
Use the numbers, make good decisionsSimple Payback Simple Rate of ReturnBeyond Payback?
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
Linwood Court, Cambridge MA (8 Bldgs, 45 Units)
Table 1: Estimated Paybacks on Water Efficiency Upgrades
Fixture # for Replacement
/Fix
Estimated Cost
Estimated Water Savings
Payback
Kitchen Aerators
30 $120 $328.50 ~4 months
Shower Heads
25 $75 $2190.00 ~13 days
Bathroom Aerators
43 $32.35 $376.00 ~1 month
Fixing Sink Leaks
4 N/A ~$100 Immediate
TOTAL = $227.30 $2994.50 ~1 ½ months
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
New Horizons, Worcester MA(1 bldg, 25 units)
Fan # # of Kitchens/ Baths in stack
CFM Rating CFM requiredASHRAE
Amount Oversized
1 4 bathrooms 160 80 2X
2 3 bathrooms 120 60 2X
3 8 kitchens 800 200 4X
4 6 kitchens 600 150 4X
5 8 bathrooms 320 160 2X
6 3 bathrooms 120 60 2X
7 7 kitchens 700 210 3X
8 3 bathrooms 120 60 2X
9 2 bathrooms 80 40 2X
10 5 kitchens 400 125 3X
11 2 bathrooms 80 40 2X
High Electric Consumption Due to Over-Ventilation
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
The Role of Retrofits: Bring In Help
• Enlist an Expert to do the:– Utility Analysis– Building Audit and Diagnostic Testing– Financial Analysis and Recommendations
July 19, 2007 New Ecology, Inc. Green Homes and Sustainable Communities 2007
new ecology, inc.
Key Issues in Developing an
Existing Building Greening Strategy
1. Recognize this is about the long term –not a quick fix—What is your time horizon?
2. Establish reasonable targets/returns
3. Measurement/Monitoring/Feedback loop
4. Document cost savings to management
5. Work with supporting players – utilities, local government, non-profits
