Case Study – Energy Efficiency – Free Cooling

A Finnish manufacturer of flexible packaging saved 37% of their annual energy consumption by purchasing a separate cooling system and production machine, rather than an integrated one. The production process requires heat to melt plastic granules but also needs alarge amount of cooling water at 10°C. By specifying separate production and cooling machines the cooling system could be designed to provide free cooling when the ambient temperature was below 19°C. The cooling for the production process is obtained from a combination of dry air coolers and standard refrigeration equipment. When the ambient air temperature falls below 4°C then the air coolers can provide enough free cooling to meet the process needs. It is estimated that this installation had a payback of 2.5 years.
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