DEMM Engineering & Manufacturing
Environmental
OPERATING AN energy optimised compressed air system brings a wealth of benefits, from reducing your electricity costs to reducing your carbon emissions and thereby your impact on the environment. But, when it comes to identifying energy saving opportunities within your existing compressed air system, what is the potential and where do you start?
“Almost three quarters of the lifetime costs of a compressor are attributed to energy,” said Peter Eckberg, managing director at Kaeser Compressors NZ. “If you take the example of a 250-kW compressor, running three shifts, seven days a week, and with electricity costs at NZD0.15/kWh, then over an average ten-year lifecycle that will cost NZD3.28 million to run in electricity costs alone!
“What’s surprising to many people, is that in most compressed air systems only around 50 percent of the compressed air produced is actually production demand. With my example above, that means that over NZD1.6 million is being potentially wasted through; compressed air leaks (25 to 30 percent), artificial demand (10 to 15 percent) and inappropriate uses (5 to 10 percent).”
“But there is good news. Many existing compressed air systems are hiding an energy savings potential of up to 30 percent. Whether you’re looking to optimise the energy efficiency of your existing compressed air system
(or upgrade to a new one) – understanding your precise compressed air requirements is essential in order to design and subsequently operate a reliable and energy efficient compressed air system.”
THE PATH TO AN ENERGY SAVING COMPRESSED AIR STATION
The first step in understanding your compressed air requirements is to undergo a compressed air audit. Here, meaningful and accurate performance data should be gathered from your existing compressed air system. This is most effectively carried out by attaching a data logger to your compressed air system for a set period of time (usually a minimum of seven days). This collects data which can then be uploaded and analysed using proprietary software.
With Kaeser’s Air Demand Analysis (ADA) and the Kaeser Energy Saving System (KESS), compressed air experts can provide compressed air users with the full picture when it comes to their compressed air station – and create the optimum solution for outstanding compressed air supply efficiency and dependability.
“Our experts will first visit the plant to gather information about the compressed air system, such as: production parameters, existing components, installation location and plans for the future.
“Using the Air Demand Analysis (ADA), we then data log the compressed air system over a fixed period of time. The data is then downloaded and analysed which allows us to generate precise consumption profiles of the compressed air station. This highlights the real compressed air demand. With the ADA we can also identify potential weak points in a compressed air system - as well as the all-important energy savings potential. Utilising the ADA therefore lays the groundwork for an optimum compressed air station.
“To determine the optimum solution, all gathered data is analysed using the Kaeser Energy Saving System (KESS). With this advanced software developed by Kaeser, multiple potential compressed air supply system solutions are compared against one another. We are then able to design the most efficient and economical solution that is precisely tailored to meet the end user’s needs.
“Maximum compressed air availability and massively reduced energy costs are often the result of such plant optimisation performed by our engineers. A reduction of energy costs of up to 30 percent is not uncommon and it has been even more in some cases! The results are often so impressive that they mark a true turning point.’
The Air Demand Analysis (ADA) audit service from Kaeser Compressors was able to identify over 5,452,580.00 kWh of savings potential with some of its customers in 2019 to 2020 in New Zealand alone. That’s NZD817,887.00 in possible savings (based on NZD0.15/kWh). Eckberg continued: ‘Based on the 2020 estimate that the average medium sized household’s electricity usage in New Zealand is 7,300 kWh per year, that’s the equivalent of taking 750 homes off the grid for one year!
“Possibly one of the greatest advantages of using the ADA and KESS is providing the end user with the ability to make informed decisions - based on real data and by showing them a number of configuration options and their potential efficiency and investment outcomes.”
The ADA and KESS measurement and evaluation methods used comply with the requirements as per ISO 11011, a standard which establishes rules, methodologies and responsibilities to enable comparability between energy audits in order to achieve enhanced compressed air system efficiency.