“Pumping and Hydraulics’ Solutions for Irrigation and Water Supply”
ABN: 92 105 345 506
PUMPING ENERGY EFFICIENCY Auditing
Firstly, up until the mid 2000's, electricity was cheap and so there was no demand for energy efficient irrigation pumping system design.
The chart, right, shows that the average Australian electricity cost was quite low until the year 2000, then climbed steadily, but since 2007, has risen dramatically. So, the exorbitant cost of electricity is now driving irrigators to despair with high operating costs.
Secondly, irrigation designs of the past have concentrated on water efficiency, but because of the low electricity costs of the past, energy efficiency has not been considered.
Therefore, it is almost guaranteed that there will be energy efficiency savings to be made on almost any existing pumped irrigation system.
What is a pumping energy efficiency audit?
An irrigation system pumping energy efficiency audit typically involves a site assessment of a number of parameters which contribute to a site's pumping energy requirements.
These include, but are not limited:
* Pump type
* Pump efficiency
* Best Efficiency Point (BEP) operation
* Electricity tariff mix
* Volume of water pumped per annum
* Pumped head
* Pipeline friction losses
* Flow management
Savings identified through these parameters are then converted to dollar savings, with associated costs to achieve those savings. The ratio of the costs to savings is referred to as a Return on Investment (ROI).
Do your own pumping energy efficiency audit.
You can conduct your own energy efficiency audit on your own irrigation system. So, what do you look for?
Unfortunately, that cant be answered without being on site. However, you can learn for yourself what to look for and how to conduct your own audit.
Tallemenco, with 48 years of energy efficiency experience in the water industry, has designed an online training course to assist irrigation operators, managers and designers to assess their own irrigation systems for energy efficiency.
For more information,
go to "Advanced Pumping & Hydraulics" Online training.
The cost of electricity in Australia has risen sharply in the last decade. This has made pumping energy efficiency audits justified and desirable for irrigators. Data from ABS, 6040.1 Table 7
Graph, R Welke
How much will a pumping energy efficiency audit save?
That depends on many factors. Installations which have high head pumps and small diameter pipes to save on upfront costs will benefit the most.
Audits which Tallemenco has conducted over the last 4 years have identified achievable savings from 15% up to 50% of annual electricity costs.
However, there is almost always a cost to implement an energy saving, such as extra pipe, pump replacement or impeller trimming, etc, to potentiate those savings. Determining if energy savings are practical depends on reviewing the cost of implementing the savings vs the value of those savings (ROI).
Return on Investment (ROI)
Generally, costs associated with achieving energy savings are evaluated as a ratio of savings. For example, it may cost $30,000 upgrading pumps/pipes to save $10,000 in annual electricity.
That is usually expressed as a Return on Investment (ROI), which in the above example is a ROI of 3. That's equivalent to investing money into your own business with a 33% return!
However, with the rise in electricity costs being much higher than CPI, it would be reasonable to capatilise those savings, thus achieving an actual higher ROI.
Tallemenco has designed software to readily analyse costs savings and ROI for clients.
An energy efficiency audit on this hydroponic lettuce farm identified annual energy savings of 50% by replacing the pumps and applying some hydraulic optimisation. ROI was 2.2 yrs.
Refer story HERE. Photo, R Welke
Energy savings on this pumping system were created through hydraulic optimisation and were potentiated by trimming the impeller to lower operating head.
Refer story HERE Photo, R Welke
Contact Rob for a quote to conduct a pumping energy efficiency audit to save operating costs on your irrigation system.
Tallemenco runs Online training courses to assist operators to conduct their own energy efficiency audits. Here, Rob Welke is conducting an online training session from Tallemenco's office in Adelaide.
Pump type and efficiency play only a small part of savings identifiable from a pumoing energy efficiency audit. Photo: R Welke
Tallemenco Pty Ltd, PO Box 74, Greenacres, SOUTH AUSTRALIA, 5086.
ABN: 92 105 345 506
Phone (08) 8121 6005 Mobile 0414 492 256
International: Phone +618 8121 6005 Cell +61 414 492 256
Why have pumping energy efficiency audits?
Jan 17th 2017
American Society of Irrigation Consultants
Full Professional Member 2011
Holistic approach to pumping audits
Almost all auditors in the Australian irrigation industry will audit only the pumps to test for pumping energy efficiency. By doing this, they are neglecting the "elephant in the room"...the huge energy losses associated with excessive friction loss in pipelines. Read more HERE
Tallemenco takes a holistic approach to pumping energy efficiency auditing and audits both the pumps and the pipelines. In fact, of all of Tallemenco's energy audits, hydraulic efficiency has yielded the most savings. However, a detailed pumping and hydraulic audit can take up to 3 days and cost $1,000's. So, how will you know that an audit will yield enough savings to cover the cost of your audit?
Audits to AS 3598 2014 Type 2
If you want to take advantage of Govt funding, you will be required to undertake a detailed energy efficiency audit to AS 3598 Type 2. This standard requires ALL farm site energy consumptions to be analysed and examined for savings, including diesel, LPG etc.
Because there are rigid additional auditing requirements and high compliance, over and above just a pumping energy efficiency audit, Govt funded audits will be up to twice the cost of only a pumping energy efficiency audit.
However, if you want the Govt audit cost subsidy, there is no choice. You will be subsidised anyway, so why worry!
The sensible approach is to get Tallemenco to do an IPEEATpro audit on you system first to determine if a detailed audit to AS 3598 Type 2 is going to yield sufficient energy efficiency savings in your pumping system to make it worthwhile!
Tallemenco has developed "screening" software, IPEEATpro, which will calculate the approximate pumping efficiency and hydraulic efficiency. This will show the pumping efficiency and the hydraulic efficiency in percentage terms, as in the photo right.
In this way, irrigation pumping systems showing high potential savings with IPEEATpro can then be targetted with a detailed audit. This approach will definitely save you time and money.
System efficiencies calculated with IPEEATpro will highlight efficiency problem areas in your irrigation system