Sample energy savings…
For example if you have a 562kW Air Cooled Water Chiller with an EER of 3.73 (supply @ 6C, return @ 12.5C in ambient @ 27C) the absorbed power is 150.64kW (Aermec NSI2502XA00). However instead of running a single chiller up to 100%, you should run two chillers @ 50% each (managed by the MultiChiller controller) so the EER of each chiller improves to approx 4.9 @ 50% load. Therefore the absorbed power of each chiller reduces to 57.39 and the total absorbed power for the two chillers reduces to 114.78kW giving you an impressive energy saving of 35.86kW PER HOUR.
Of course you need to generate the flow through the additional chiller, so I have selected an additional water pump to deliver 74m3h @ 1.1bar which has a max absorbed power of 3kW. When we account for the additional power consumption for the second pump (for the 2nd chiller), the energy saved is 32.86kWH or 49,290kW per year (based upon two chillers running at 50% load for 6 hours operation per day with each at 50% load, 5 days p/wk and 50 weeks p/yr.).
SAVE 22% OF RUNNING COST
If you wish to convert this to a financial saving and assume an energy cost at €0.12kWh this equates to a saving €5,914.80 PER YEAR. As the cost of the MultiChiller controller is approx €3,000 incl commissioning, the payback is just six months.
Of course as we are using very general information for the cost saving analysis which can differ greatly dependant upon other factors such as varying load and varying ambient conditions. However I believe its still fair to say that this can be considered a ‘no brainer’ to use the MultiChiller controller to manage the efficiency of multiple Aermec chillers.