Improving Irrigation Scheduling and Water use Efficiency ...
Irrigation energy efficiency evaluations
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Transcript of Irrigation energy efficiency evaluations
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IRRIGATION ENERGY EFFICIENCY
EVALUATIONS
Energy use - the unknown cost
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The project – pilot study
• Funders EECA, Canterbury lines co, meridian, Environment Canterbury
• 15 on farm evaluations
1. Motor, pump, delivery system Efficiency & Performance
2. Scheduling/operation efficiency
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The outputs
• Key Indicators
o Energy consumed per volume of water used, kWh/m3
o Power capacity per hectare kW/ha
o Cost per m3, $/ m3
o Volume of water used per hectare/ irrigator
o System capacity, mm/ha/day
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Challenges
• Awareness of what water costs
• Data collection - is one flow meter enough?
• Bench marks
• Knowledge of what irrigators should be operating at flow and pressure
• Record keeping – as built plans, commissioning reports, performance testing reports
• Interpretation of data
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What have we found
Huge Range
• Issues
• Costs
• Savings
• Solutions
• Paybacks
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Differences within a property
AREA FLOW RATE
AREA SERVED ha
ELEC POWER DRAW kW
kW/Ha
Pivot 1 70 110.5 45 0.41 Pivot 2 60.8 99.5 45 0.45 West Sprinklers
12 36 18.5 0.51
Ocmis Gun 15 30 60 2.00 East/Gallery Sprinklers
N/A 30 22 0.73
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Options for solutions
• Two pumps feeding two pivots using joined line
• PRV in network to reduce pressure.
• The pump curve indicates each putting out around 570kPa of pressure,
• actual measured pressure is 445kPa,
• restrictors using 125kPa of pressure.
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Options for solutions
OPPORTUNITY CAPEX SAVINGS PAYBACK
Install a VSD on P1 and P2
$20,000 $7,980* 2.6 yrs
Reduce the impeller size on P1 and P2
$4,000 $5,980** 0.7 yrs
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Issues – scheduling
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• Photo of berry gallery
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Issues - maintenance & compliance
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Regular maintenance
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Issue - system redesign
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Issue - system redesign
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Issue - system redesign
• Acton water charge $38 500• 25% = $9500 wasted because could not
access• Whole system revamp - $182,818.62
o $ 26,396 upgrading mainline o $ 156,422 new pivot.
• Access all of Acton water, more water, energy savings from mainline changes, better use of water
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Issue – poor supply intake
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Issue – poor supply intake
BEP flow Selected to supply
Delivering Cost p.a
Pump 1 75 71 52 $2136
Pump 2 51 41 33 $3944
$6080
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Options to fix
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What do we need to do
• Smarter use of water, and electricity, use data
• Farmers can find it difficult to interpret data - wary of information overload
• Need to have a starting point – commissioning and understanding very important- baseline to compare from set point within season and between seasons
• O and M important - be able to ID quantifiable change
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Information and tools
• Tool that combines all of the data streams -Water use, electricity use, climate data.
• That spits out an automated monthly report with the Key Indicators for them to compare this months data against last month and the month before that ….
• Regular checks audit? Performance assessment?
• Asset management