Smart Schools: Water Use Efficiency · Water Use Efficiency Frank Loge, Director, CWEE, UC Davis To...
Transcript of Smart Schools: Water Use Efficiency · Water Use Efficiency Frank Loge, Director, CWEE, UC Davis To...
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Smart Schools: Water Use Efficiency
Frank Loge, Director, CWEE, UC Davis
To research, develop and disseminate efficient technologies and system-based policies for the
integrated conservation of water and energy resources.
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CA State Policy Momentum • SB7X7 (2010): 20% reduction in urban water use by 2020 • Green Building 2012 (EO B-18-12): State agencies reduce water
use by 20% by 2020 • CEC research investments (2005 and ongoing) • Water-Energy Team - Climate Action Team (WET-CAT) • CPUC EE Program Bridge Funding (2013-2014) • Carbon Cap & Trade (AB 32)
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The Energy Landscape in CA
• Energy sales decoupled from profits in 1978 (natural gas) and 1981 (electricity)
• Decoupling ‘Plus’ (2007)
• Public Goods Charge on energy bills (1997)
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The Water-Energy Imperative
• The Scope of the Challenge in CA:
– 20% of Electricity
– 30% of Natural Gas
– 2.1M Barrels/year of Diesel
– 100M metric tons CO2-eq.
4,000
12,700
kWh/M gal.
Source Convey Treatment Use Convey Treatment Disposal
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Three Main Opportunities
• Improve energy efficiency in the water sector
• Water Conservation and Efficiency
• Demand Management
– Peak load reduction
– Peak shifting
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One of the first zero net energy
communities in the U.S.
Includes:
o Community college
o Retail
o Apartments
o Student housing
o Homes (for faculty/staff)
UC Davis West Village Development
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Residential Community Information UC Davis West Village Case Study
Site No. of
Units
Avg
Occupan
cy
(ppl/unit)
Landscap
ing Area
Single-Family Residence 1 2.5 830 ft2
Multifamily Complex 540 3-5 14 acres
Overall
Community
Single-Family 475 2.5
76 acres Multifamily 883 3.2
Student
Cottages
285 1.5
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Baseline water use and zero-net water use goals UC Davis West Village Case Study
Site Site
Area
Zero-Net
Water Goal
(mgy)
Baseline
Water
Use(mgy)
Single-Family
Residence 3,800 ft2 0.041 0.065
Multifamily
Complex 20 acres 9.24 51.9
Overall
Community 220 acres 102.1 154.3
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Indoor water use duration and flow per indoor water efficiency scenario UC Davis West Village Case Study
Application Durati
on
Daily Uses
(per
person)
Baseline
CA
Plumbing
Code
Scenario 1
[CalGreen
Efficiency]
Scenario 2
High
Efficiency
Showerhead (gpm) 8 min 1 2.5 2.0 1.5
Lavatory faucet
(gpm)
0.25
min
3 2.2 1.5 0.9
Kitchen faucet
(gpm)
4 min 1 2.2 1.8 1.25
Toilet (gal/flush) 1 flush 3 1.6 1.28 0.9
Clothes washer
(gal/cycle)
1 cycle 0.37 23 11 11
Dishwasher
(gal/cycle)
1 cycle 0.1 6.5 2.4 2.4
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Landscape Water Efficiency UC Davis West Village Case Study
Replace landscape with drought tolerant plants
Meet California code 1 Install weather based or moisture sensing irrigation controllers.
2 Average Reduction of 16%
Change grass 1 Replace conventional turf with drought tolerant warm season grass {UC Verde®
Buffalograss) in addition to measures above
2 Average Reduction of 28%
Combination of methods 1 Install moisture sensing controllers + drip/micro spray irrigation + effective management
and maintenance of operations in addition to measures above
2 Average Reduction of 40%
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West Village Case Study
Payback periods for retrofitting residential buildings with aggressive water conservation: - Water saving alone = 14 years - User Energy = 5 years - Water and Energy = 3 years
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Thank You