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Efficient Irrigation

    Table of contents

    Opportunity

    Facilities meeting one or more of the following criteria may benefit from this opportunity.

    • Multiple pumps run in parrallel
    • Pumps are not checked for impeller wear or damge annually
    • End use requirments vary significantly from day to day

     

    Background

    In any irrigation system, opportunities for reduced operating cost arise out of:

    • Lowering required water horsepower by:
      • Reducing pumping outlet pressure by minimizing distribution line pressure losses, and end of line pressure requirements.
      • Reducing the volume of water pumped by ensuring excess water is not delivered to any end points, or bypassed to source without being used.
    • Increasing pump efficiency. The efficiency of any particular pump is a function of:
      • Operating point on its flow versus head curve: pumps have one Best Efficiency Point (BEP) and efficiency deteriorates as the point of operation moves away from this point.
      • Pump wear: as a pump ages, both impeller and housing wear and pump performance and efficiency deteriorates.
      • Pump design: Pump efficiency can be improved by
        • Ensuring it operates as close as possible to its best efficiency point
        • Overhauling it
        • Replacing it with a better selected pump

     

    Templates

    These templates are excel based spreadsheets that quickly and easily help users quantify energy savings, cost savings, implementation costs, and payback.  The excel spreadsheets then automatically write a professional looking report for users to utilize as they see fit.

     

    Examples

    Following is an example of a recommendation prepared with this tool:

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