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How to Save Energy – Being Sustainable
1. Repair or Replace Inefficient Pumps
2. Install Complete Pump Station with Energy
Saving Features:
Pump Efficiency
Assessments
2011
Goals of Program
1. Pump Efficiency Education
Manufacturers, Distributors,
ASP’s, Customers, Utilities
2. Performing Pump Efficiency
Tests
3. Install and Maintain High
Efficiency Irrigation
Pumping Plants
4. Manage these plants
5. Assist in Locating Rebates
and Incentives
Variable Frequency Drive
Premium Efficient Motors
Controls Upgrade or Complete Station
3. Monitor Energy Consumption
Usage & Demand Charges
Department of Energy – PSAT (Pumping System Assessment Tool)
Rain Bird PEA Program
Process of Pump Efficiency Audit
1. Water and Power Usage Data
Tells a Story about Past and Future Needs and Challenges
Provides Overall Pump and Water Energy Audit
2. Visit the Pump House and Operate the Station
3. View Water Source and Well Condition
4. Building and Power Source
Lockable, Code Requirements, Safety, Slab, Access
5. Physical Condition of Station
Skid, Pumps, Motors, Electrical Panel, Control Valve, Pressure
Relief Valve, Air Relief. (Horizontal or Vertical Turbine)
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Process… Continued
6. Physical Station Capability/Capacity
Pressure Set point – Pressure Maintenance Pump?
H.P. Size of Motors – Estimate GPM.
Example #1
(Tested in Nov 2009)
25 Year Old Constant Speed Pumping System
65 Million Gallons Pumped/Year.
7. Control Capability
Controls – Control Valve or VFD/PLC? (Lead, Lag)
VFD (Switching Contactors – Hours) or Constant Speed
8. Discharge
Re-use or New Connection? (Z-Pipe)
9. Service Records
Annual Budget
Annual Energy Use - $15,000(2008) / $20,000(2009)
•
Estimated Inefficient Pump Savings (14%) - $26,000/10 years
•
Estimated VFD Savings (15%) - $30,000/10 years
•
Estimated Smart Pump Savings (5%) - $10,000/10 years
Combined Assessment Savings:
Obsolete Control System:
34% or $66,000 in Energy Savings Alone
Inefficient Pressure Sustaining Valve (Constant Speed Pumps/No VFD)
No Operator Interface (Limited Logic, Adjustability – Pressure, Lockouts, etc.)
Demonstrates ROI and Performance Matters
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Summarize the Savings
Example #2
•Motor Rebate
= $7,500
Time Required : 1 Hr in each Pump House.
•Drive Rebate
= $15,000
Tools Required: Note Pad and Digital Camera
•Energy Savings = $40,000
Physical Assessment Only - No Efficiency Test
Findings
•Leaking Check Valves
•Corrosion (Pinholes)
•Dated Control System
•Wobbling Shafts/Bearings
•Worn Seals
•Failed Filtration System
•15 Year Old VFD
•Repair Savings = $20,000
•Total Savings
= $82,500
Cost of Replacement Station $125,000
Net Cost $42,500
Pump Assessment can be completed with minimal tools.
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