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.

This Technical Guide provides guidance on the conversion of existing coal fired boilers to wood pellet operation. There are a number of obvious advantages to using wood pellets: they are 100% renewable and relatively clean burning. Of paramount importance in a conversion is the need both to maintain the safety and integrity of the boiler and control systems, and also to improve safety to the level of best practice.

Circulating chilled water or glycol systems are very common in many industries. The chillers often have internal temperature probes that result in unnecessary circulating pump running costs. Moving the temperature probe to another part of the system can be a cost-effective energy saving opportunity.

Read the case study below to find out how Millennium Plastics Ltd changed their chiller control system and reduced annual electricity use by 7,100kWh.

LinkPlas Ltd is a manufacturer of PET containers based in Albany. The company requires a reliable supply of cooling water to cool its injection moulding machine hydraulic-systems.

Their cooling tower is sized to achieve the required cooling duty on the hottest days of the year, and their fan ran continuously at a fixed speed, so much of the time the amount of water cooling far exceeded what was required.