Case studies

Tegel Foods has installed a heat exchanger which is expected to save the company more than $100,000 a year.

With just two years payback, Tegel foods is also expected to save 628 tonnes of CO2 a year.

The plant needs considerable refrigeration and uses a lot of hot water, making it an ideal candidate for a heat recovery system. Refrigeration creates waste energy in the form of heat, while heating large quantities of hot water requires a lot of energy.

After installing a permanent magnetic stirrer in their gas-fired furnace, the aluminium extrusion and fabrication manufacturer, MCK Metals is saving 6.8 per cent in gas energy consumption.

The permanent magnetic stirrer not only reduces the melting time required, it also increases the amount of aluminium melted per hour.

In addition to the energy savings, the stirrer delivers other benefits: its maintenance free, easy to operate, and has a large circulation capacity. It also reduces wastage and improves product quality.

Clive Scouring in Napier is capturing heat previously released as waste and turning it into energy savings worth more than $100,000 a year.

Clive Scouring captures energy from its chimney and uses it to pre-heat water for other processes at the plant.

The project has a one-year pay back and on top of the energy savings, the new system has also cut the company's annual CO2 emissions by 516 tonnes.

Southern Lakes Laundries has installed a high-efficiency heat exchange unit for their main industrial washing machine that is delivery savings of up to $45,000 a year.

Southern Lakes Laundries retrofited the heat exchanger into their existing equipment without any disruption to their 364 day a year operation.

The project payback period is approximately 2 years.