INDUSTRIAL & COMMERCIAL COOLING CHILLER EFFICIENCY
‘Free-cooling’ chillers using inverter technology, which are said to boost effi ciencies (Image courtesy of Hitema)
BOOSTER PERFORMANCE
I
Inverter technology can be effectively used to produce chiller units with even greater effi ciencies than previously considered possible, writes Maurizio Burba
n the refrigeration and air conditioning sector, attempts are made to reduce the energy consumption of all systems by improving the management of cooling
power, optimising the use of water-glycol fl ow and providing greater temperature accuracy. The use of screw compressors is common
amongst high-capacity chillers (those greater than 300 kW) and this article will explore the use of inverter speed control technology to reduce their power consumption during part-load operation.
Inverter technology An inverter is an electrical device that varies the voltage and frequency of the power supplied to a motor. Inverters widely use fi lm-polyester capacitor confi guration that have good longevity and low current distortion. The compactness and longevity of inverters can be further improved by cooling
www.cibsejournal.com February 2012 CIBSE Journal 43
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