water efficiency

Energy Efficiency for Water and Sanitation Utilities Evaluation of Water Pumping Systems A series of IDB manuals and tools for water and sanitation utilities

Ground electric resistance measurement

ROD Y

TEST ELECTRODE

ROD Z Aligator clips

R R ELECTRODE X O%

ROD Z ROD Y 52% 62% 72%

100% distance between X and Z

The manuals and tools are for water and sanitation utilities of any size to assess the energy efficiency of their water pumping systems.

The Inter-American Development Bank has produced a series of manuals and tools to help water and sanitation utilities reduce the amount of energy used in pumping water.

On average between 30% and 40% of the operating budget of water supply services, in addition to 25% up to 30% of the budget of water treatment plants is used in energy.

With this methodology, the potential to reduce energy costs is between 10% and 40% for utilities and up to 75% for water treatment plants. These manuals and tools will allow the region’s water and sanitation operators to take advantage of this potential and to become more energy efficient.

What is their methodology?

Four manuals and electronic tools guide the user to perform detailed energy and maintenance audits as follows:

Calculation sheet

Manual on energy efficiency

Manual on maintenance

Guide for the calculation sheet

1 2 3 4 How do companies apply this methodology?

Water and sanitation companies must commit to devoting adequate human resources for performing the following activities: • Carry out performance evaluations on energy consumption, including its relationship to system operation and maintenance.

• Design an action plan, which involves defining goals, timeline, staff responsibilities, and resources required.

• Gradually implement a dynamic system of procedures, information management, and data analysis, for the programming and execution of monitoring and preventive maintenance activities of the systems.

• Evaluate and monitor the results, which involve measuring progress of the plan’s implementation and tracking actual results or benefits achieved on a periodic basis and at the conclusion of the process.

What does this methodology enable a utility to achieve?

• Identify standard energy-saving measures for pumping water.

• Calculate energy savings, estimate investments required, and determine time needed to recover these investments.

• Identify best practices for water pump maintenance.

• Identify typical maintenance weaknesses and errors.

SAVINGS 25.0% USEFUL WORK 30.3% 30.3%

ELECTRICAL LOSSES 0.5% 0.3%

MOTOR LOSSES 15.4% 7.5% LEAKAGE LOSSES 20.2% 20.2%

PUMP LOSSES 31.6% 14.8% NETWORK HEAD LOSSES 1.9% 1.9%

Example of energy balance

%before %after

What will be the results?

By applying the methodology contained in the manuals and tools, users can do the following: • Draw up a plan of action to increase efficiency and reduce energy costs, including a simple energy balance.

• Propose energy saving measures suitable for a given utility’s operations, including an investment plan.

• Create a comprehensive maintenance plan that includes the following: • Inventory of equipment.

• Identification of activities and frequency of their execution.

• Work program.

EFFICIENCY PLAN IMPLEMENTATION

INVESTMENT GRADE ENERGY AUDIT Main data search

Evaluation of real saving Costs evaluation

Evaluation and quantification Evaluation (Diagnosis)

Maintenance procedures Work supervision Required adjustments

Implement the action plan

Define activities and priorities

TRAINING Energy efficiency management committee

Energy balance Energy indicators Identify saving oportunities

Responsibilities Executive project Financing plan

Action plan

Critical route and dates

Components of an Energy Efficiency Program

Project definition and evaluation

Administrative Operation and maintenance Investment Project definition Savings evaluation

Expected energy index evaluation Economic evaluation

Measuring the tension in pumping systems

Output to motor

a

b

M

c

Main switch

PUMP a

b

c Ground

n

Energy input

You can get this electronic tool on our website:

http://www.iadb.org/energyefficiencyinwater

Inter-American Development Bank 1300 New York Avenue N.W. Washington D.C. 20577