water conservation: current & future trends and a (small) success story by richard m. silberman...
TRANSCRIPT
Water Conservation:
Current & Future TrendsAnd
A (small) Success Story
ByRichard M. Silberman
Co-President, Managing DirectorHealthy Buildings
Price = f(supply, demand)
Limited Supply
Uneven Supply
Our Problem: Aging Infrastructure
Demand: Population Growth
Demand: More Uses
Current & Future Trends
InWater Conservation
Low/No Flow Bathroom Fixtures
Leak Detection
One bad toilet leak can result in > 1,000 gallons/day of wasted water!
Cooling Towers
Measure, log, analyze to maximize cycles of concentration
Rainwater Harvesting
Greywater Recycling
Water Efficient Landscaping
Water Efficient Irrigation
A (small) Success Story:
The Tower Companies1828 L Street NW
“Toilet Fixture Customization”(a.k.a. “Fixture Tuning”)
Water Use in Commercial Buildings
The average daily water use in U.S. commercial buildings:
20 -- 35 gallons per day per employee
Toilets account for 31% of ALL indoor water use in the U.S.
Problems with Fixture Replacement
• Expensive
• Sometimes Ineffective
• Disruptive
• Intrusive
Flushometer Assembly
3.5 GPF2.4 GPF1.6GPF1.28 GPF
COMMERCIALLY AVAILABLE FLUSHOMETER ASSEMBLIES
UnnecessarilyHigh
Often Impractically Low
3.5 GPF2.4 GPF1.6GPF1.28 GPF
Identifying the “Sweet Spot” for Assembly Customization
UnnecessarilyHigh
Often Impractically Low
Tuning “Sweet Spot”
“Custom” Flush kits designed & assembled by Healthy Buildings, as part of the WET
Program. Ideal Flush rates are determined by the existing china models and water
pressure
Results Summary – Year 1
Estimated Savings
834,905 gallons$9,6871.6 yr simple payback
Actual Savings
1,115,956 gallons (26.3%)$12,3231.3 yr simple payback
