pump station optimization - the portland water bureau’s
TRANSCRIPT
Pump Station Optimization - The Portland Water Bureau’s Approach to Energy Management
Presentation Outline
• Framework • System Overview • Historical Power Use • Pump Station Optimization • Other Strategies
Framework
• Water & Wastewater Utilities Consume 3% of Energy in US
• 90 – 95% of Energy Consumed by Water Utilities is used by pumps –Raw Water Intake –Wells –Treatment Plants –Booster Pump Station
Total Annual Water Bureau Electricity Use for All Facilities
0
5,000,000
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
35,000,000
40,000,000
2005 2006 2007 2008 2009 2010 2011
Year
kWh
* Baseline is Average Annual Electricty Consumption from 2005 - 08.
Baseline*
2010 Water Bureau Electricty Use by Sector (kWh)
Other 4%
Pump Stations 69%
Treatment 5%
Fountains (pumping) 7%
Occupied Bldg 10%
Groundwater (pumping) 5%
Electricity Consumption
2011 Water Bureau Electricty Use by Sector (kWh)
Groundwater (pumping) 24%
Occupied Bldg 8%
Fountains (pumping) 5%
Treatment 4%
Pump Stations 55%
Other 4%
Monthly Electricity Use for Water Bureau Facilities
0
1000000
2000000
3000000
4000000
5000000
6000000
7000000
8000000
9000000
Jan-
04
Apr
-04
Jul-0
4
Oct
-04
Jan-
05
Apr
-05
Jul-0
5
Oct
-05
Jan-
06
Apr
-06
Jul-0
6
Oct
-06
Jan-
07
Apr
-07
Jul-0
7
Oct
-07
Jan-
08
Apr
-08
Jul-0
8
Oct
-08
Jan-
09
Apr
-09
Jul-0
9
Oct
-09
Jan-
10
Apr
-10
Jul-1
0
Oct
-10
Jan-
11
Apr
-11
Jul-1
1
Oct
-11
Month
Elec
tric
ity (k
Wh)
Total Water Bureau Electricity Use
Ground Water Electricity Use
Pump Stations
Challenges
• Pump and Motor Efficiency
• Weather affects demand for water
Manually Controlled
Valves
Pressure Regulator NW Seblar Terrace
Easement
Overflow 990
Overflow 1044
Penridge Tank
Greenleaf Tanks 1 & 2 Greenleaf PS
(elev. 1224 ft.)
Calvary PS (elev. 992 ft.)
Springville PS (elev. 426 ft.)
Hoyt Park PS (elev. 820 ft.)
Burnside PS (elev. 700 ft.)
Calvary Tank
From Arlington Hts Tanks
From Arlington Hts Tanks
From Whitwood
Tank
To Tualatin Valley WD
Local Distribution Grid
WCC Controlled
Valve
Overflow 1250
Overflow 1200
Overflow 1315
Check Valve
Forest Park High Tank
Willalatin Tank Pressure
Regulator
Water Distribution Schematic for Northwest Hills Facilities Figure 1
Pittock Tank
From Verde Vista P.S.
PWB Strategy • Focus 7 Largest Pump Station • PS Improvements
–Pumping Efficiency Optimization –Pump/Motor Replacement –Weatherization
• Pump Station By-Passing – Is there a way to get water to
customers without pumping?
Pumping Efficiency Optimization
Pump / Motor Replacement Efficiency Range of Pumps at Top 7 Pump Stations
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
WashingtonPark to PDXHeights***
Sam Jacksonto PDXHeights
WashingtonPark to
SherwoodField*
Carolina* Fulton* Hoyt** Barbur-Gibbs Sam Jacksonto Marquam
Hill
Sam Jacksonto Broadway
Drive*
Marquam Hill
% E
ffici
ency
Ran
ge
*Currently pumping favors most efficient pump(s)**Pump/Motor replacement project in progress***Efficiency may not be accurate due to flow meter error
Energy savings by favoring more efficient Pump / Pump Station
0
1,000,000
2,000,000
3,000,000
4,000,000
5,000,000
6,000,000
7,000,000
2006 2007 2008 2009 2010 2011
Elec
trici
ty U
se/Y
ear (
kWh)
Carolina PS
Fulton PS
Hoyt Pump Replacement
• 10% efficiency gain • Project cost =
$41,500 • Electric Utility
Provider incentive covered 50% of project construction cost, through state of Oregon program (ETO).
PS Weatherization
© 2009 Water Research Foundation. ALL RIGHTS RESERVED. 17
• Poor Insulation • Air Leaks • Electric Resistant Heat = up
to 5,000kWh/month • Goal
– Prevent freezing – Reduce humidity – Comfortable work zone?
• Strategies – Reduced temperature (freeze
protection) – Programmable thermostats – Weather-stripping – Louver and vent covers – Winterize/Summerize Checklist
Results
Energy Use by Sector
• Groundwater contributed to increase in 2011
Type of Facility 2005 - 08 Baseline 2010 2011Pump Stations 14,844,882 13,240,241 12,921,575 Groundwater 6,537,153 972,971 5,653,653 Occupied Bldg 2,159,840 2,006,680 1,809,685 Fountains 1,218,799 1,285,600 1,269,767 Treatment 896,601 993,520 856,190 Other 1,147,076 737,320 824,383 Total (kWh) 26,804,350 19,236,332 23,335,253
• 1.8 Million kWh/yr saved • 830 Tons of Carbon Dioxide
Efficiency at top 7 Water Bureau Pump Stations*
0
100
200
300
400
500
600
700
800
2005 2006 2007 2008 2009 2010 2011
Year
gal/k
Wh
** Baseline is Average Efficiency from 2005 - 08.
Baseline**
* Top 7 Water Bureau Pump Stations include Washington Park, Carolina, Fulton, Sam Jackson, Barbur-Gibbs, Hoyt & Calvary
EFFICIENCY
Other Strategies
• Lighting Upgrades • Employee Outreach • Demand Shift
Demand Shift
Sam Jackson Pump Station - 2011 Peak vs. Off-Peak PumpingNote: Electricity use at Sam Jackson Pump Station represents about 6% of total PWB electricity use.
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
Standard Operation* Modified Operation**
kWh
Peak Pumping (Mon - Sat 6:00 am - 10:00 pm)
Off-Peak Pumping (Mon - Sat 10:00 pm - 6:00 amand All Day Sunday)
This operational change represents $5000 worth of savings during 2011.
*Standard Operation was prior to Jan 2011, when pumps were operated approximately 2/3 of the time during peak period and 1/3 of the time during off-peak period.
**Modified Operation is after Jan 2011 when pumps were operated as much as possible during the off-peak period. Pumps may be operated during the peak period if tank levels are low or for other necessary operational purposes.
Renewable Energy
Meter Shop Solar
Solar on the Slough
Vernon-Micro Hydro Generator Groundwater Treatment Bldg Solar
Questions?