Control systems

Fitting a variable-speed drive to a fan motor for a boiler has already saved Juken Nissho's Wairarapa mill $20,000 on a $50,000 investment made a year ago.

Higgins Aggregates operate several quarries in the lower North Island. At their Te Matai quarry, the water is sourced from an artesian well. A bore booster pump takes the low-pressure well water and supplies high-pressure water for plant wash-down hoses, dust suppression, and domestic use in the administration building and workshop.

An energy audit identified the opportunity for improved booster pump control.

Rohm and Haas manufacture a range of products, mainly for use in the manufacture of paints.

They reduced the costs of their cooling water circulation system by fitting a variable speed drive. This resulted in electricty savings of 49,680kWh, producing a cost saving of $5,460 per year.

Pernod Ricard New Zealand achieved light energy savings of 90% at its Glen Innes site, saving $100,000 per year. On top of substantial cost savings it's also made the work environment safer - and savings are expected to increase.

Read the case study below to find out more.