Cool - Rittal installs new chillers for Irish manufacturing facility

Whether variations in temperature are a result of the waste heat generated as a by-product of its activities, or from fluctuations in the ambient temperature of its surroundings, the nett result can be the same.

For this reason, correctly specified and well-maintained climate control systems are required to support manufacturing automation, but not as a fit-and-forget option. Regular maintenance and system reviews are also necessary to ensure performance levels are maintained as systems age and production line capacity increases. Rittal was approached by a manufacturing business based in Ireland which produces and distributes insulation products for the Irish and UK markets. Three of its production lines were supported by electrical equipment that was protected by a 25kW climate control system.  This was configured as one chiller feeding three heat exchangers (HEX) in order to maintain temperature levels at 27 degrees Celsius.

However, the chiller was struggling to maintain this level, particularly on days when ambient temperature was higher. Operators at the plant used an 18 degrees Celsius coolant but this was still not delivering an acceptable performance. Not only was the chiller constantly running, temperatures were regularly creeping above a declared critical threshold of 28 degrees Celsius. The business was in danger of losing all production if the (overworked) chiller broke down, and whilst the chiller should have had spare cooling capacity, it was constantly struggling to meet the demands of supporting three HEXs.

Rittal’s sales engineer Paul McGarry had some initial discussions with the business, centring around replacing the chiller with a similar unit, albeit one with an IoT interface to integrate chiller data into the DCS for better process control. However, Paul’s expertise in climate control led him to suggest an alternative solution.  This involved splitting the HEX circuit into three independent circuits (one per production line) so that each one could be controlled independently; particularly helpful as one line was always running hotter.  The main advantage was that it introduced redundancy into the system too: the current configuration meant that a chiller failure stopped all production across every line. The alternative system ensured two lines would still be in operation should one chiller fail. 

In order that the correct product was chosen, coolant flow rates needed to be accurately measured and all external parameters had to be accurately recorded. Paul’s recommendations were backed by Rittal’s international network of climate control experts (Stephen Ruch and Bjoern Burger in Germany) who calculated the flowrate at 15 l/m with a total cooling output requirement of 15kW - an energy saving over the existing system (25kW cooling output).

Once the three new 3334400 chillers were specified, together with their IOT interfaces, they were installed in late August 2019. The company’s production manager has expressed his delight at the ease of installation, how well the new IoT interfaces communicate with the DCS system and how much the system feedback and production control has improved. Added to which, the newly configured system with three chillers is now more dynamic and stable than the previous one. Cool.