Selby based paper and corrugated case recycling manufacturer, Rigid Paper
had been suffering production losses due to inverter drives overheating
in their enclosures, when it approached Rittal for a solution to the
problem. Plant conditions prevented the use of conventional enclosure
cooling - filter-clogging paper dust, moist air and ambient temperatures
of up to 45°C all precluded the use of a forced air cooling system.
Instead, Rittal proposed its ReCool air/water heat exchanger system (a
typical example of which is pictured here), which allows the enclosures
to be cooled within a sealed environment using chilled water as the heat
transfer medium. This particular project called for nine 5kW air/water
heat exchangers to be installed on the enclosures, and these are
connected via a 20m pipe to a 37kW ReCool chiller unit located in a less
aggressive environment.
This type of cooling offers a standard IP55 protection rating, and the
simple cooling devices comprise just two working parts, which ensures
high reliability. Since the chillers were installed, Rigid Paper's
enclosure temperatures have been held below 30oC and the internal parts
of the enclosures kept free of dust and water vapour. Moreover, the
capital cost of the installation is expected to pay back very quickly,
thanks to the improvements in uptime throughout the plant.
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