Free cooling

Free cooling
© nikkytok, image #89677847, 2017, source:
Energy, Carbon
All manufacturing industries, Food processing, Hotel and restaurant, Wholesale and retail
Investment cost:
High cost
Payback time:
5.8 Year(s)
Cost savings:
5 - 20% / 24525€ / Annual: € 24 525 (£ 22 500)
Resource type:
Resource saving:
Annual: reduced power demand; 250 000 kWh or 125 080 kg CO2 equivalent
Investment cost:
141700€ / € 141 700 (£ 130 000) per project; the scale of the project depends on cooling requirements; free cooler (dry chiller) should only be installed as a lead chiller; mechanical compression unit should always be installed (combined units are available); regular maintenance checks are required
Assumptions taken in the presentation of the above performance indicators:

Installation of chilled water free cooler (dry chiller) and closed control units; works where current cooling does not use free air, is inefficient or requiring an upgrade; assumed data centre with an annual cooling load of 500 000 kWh, average maximum temperature below 17° C for 70 % of the year

Free cooling can assist in cooling water which is subsequently used in industrial processes or air-conditioning systems. It is an economical system which can help reduce costs and energy uses.

Free cooling uses low outside temperatures to chill the water and can replace mechanical refrigeration systems. When the air temperature is lower than the temperature of the water needed, free cooling is a great option.

Consider using free cooling when:

  • Chilled water is needed at 10° C or above
  • Frequent or constant cooling is required all year round
  • The outside temperature is low enough to meet the chilled water requirements

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