With local electricity costing USD 0.43 per kWh, the single most important cost driver for RO plants on the Bermudian market is energy. And the new Danfoss components have halved energy consumption from 22 kWh to 11 kWh per 1,000 US gallons.
"An efficient positive displacement pump like the APP 30 and double iSaves are definitely the main reason for these good results," explains Woolley. "But we have continued to fine tune our
VFDs to adapt to demand, and tweak even more savings out of the system."
By replacing constant flow with variable flow, and making use of default soft-start settings, ROCONSERVICES has not only trimmed electricity bills – it has also reduced wear and tear on moving parts, further contributing to low maintenance.
Extended service intervals were part of the plan, but ROCONSERVICES had not expected them to be this long. "The recommended service interval for our Danfoss equipment is 8,000 hours. We've been running for 15,000 hours without any major service – so we're pretty happy about that. In addition to being one of the lowest price water providers on the island, we'd also like to be one of the most successful."