Agricultural Irrigation Water

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Agricultural IrrigationWater Energy Management
Kerry Harrison Extension Engineer University of
Georgia Biological Agricultural Engineering
Dept.
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Determine how much water is needed
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GPM x TDH
HP
3960 x Eff
Where Hp Horsepower
GPM Gallons per minute
TDH Total dynamic head (ft)
Eff Pump Efficiency
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ELECTRICITY - Cost per hour of pumping (Based
on Motor Efficiency of 88 1.18
hp-hr/KWH) Pump Load HP Rates per
kilowatt-hour 6 cents 8 cents 10 cents 12
cents 14 cents 16 cents 10 0.50 0.68 0.84 1.02 1.1
8 1.36 20 1.02 1.36 1.68 2.04 2.37 2.72 30 1.53 2.
04 2.52 3.05 3.56 4.08 40 2.03 2.72 3.40 4.06 4.74
5.44 50 2.54 3.40 4.24 5.08 5.94 6.80 75 3.81 5.0
8 6.36 7.62 8.90 10.16 100 5.08 6.78 8.48 10.16 11
.86 13.56
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DIESEL - Cost per hour of pumping (Based on
16.00 hp-hr/gal. - Corrected for 5 drive
loss) Pump Load HP Fuel cost per
gallon 2.40 2.80 3.20 3.60 4.00 4.40 10 1.5
4 1.68 2.04 2.24 2.56 2.82 20 3.06 3.14 4.08 4.60
5.12 5.64 30 4.60 5.18 6.12 6.92 7.64 8.40 40 5.90
7.00 7.88 8.88 11.84 12.82 50 7.44 8.76 9,92 11.1
6 12.40 13.64 75 11.16 12.96 14.88 17.48 18.60 20.
46 100 15.10 17.44 20.12 22.28 25.16 27.68
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Other (Electrical) Considerations
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Other (Electrical) Considerations

• Availability of 3 phase power

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Other (Electrical) Considerations

• Availability of 3 phase power
• Possibility of power interruptions

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Other (Electrical) Considerations

• Availability of 3 phase power
• Possibility of power interruptions
• Standby or demand charges

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Other (Electrical) Considerations

• Availability of 3 phase power
• Possibility of power interruptions
• Standby or demand charges
• Condition of existing diesel engine

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Other (Electrical) Considerations

• Availability of 3 phase power
• Possibility of power interruptions
• Standby or demand charges
• Condition of existing diesel engine
• Stability of diesel fuel price

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