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Certificate Number 011030
Free Cooling
Chilled water systems generally depend upon water chillers to maintain
year round design water temperatures, but in the UK, the ambient temperature
is below 15°C for almost 75% of the year.
By installing an air blast cooler as a free cooler into the chilled
water system, massive energy savings can be realised.
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Principle of operation:
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- When the ambient temperature falls 1ºC below the temperature of
the water returning to the chiller, eg. water return temperature 15ºC,
ambient 14ºC, free cooling can be activated.
- Before entering the chiller, the return water automatically diverts
through the free cooler, pre-cooling it thereby reducing the
load on the chiller and the energy being consumed by the compressors.
- The lower the ambient falls below the return water temperature, the
greater the free cooling effect and the greater the savings.
- At just 3ºC below the return water temperature, the compressors would switch off and only the low power fans on the air blast cooler would then be consuming energy.
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Free Coolers:
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- Free coolers of this type can be retrofitted to existing chilled water
systems as well as incorporating them into new ones.
- Pay back is fast
and energy savings year on year considerable.
- Installations of free cooling systems and chillers can qualify for interest free UK Government backed Energy Efficiency Loans.
- Follow this
link for more information.
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Free Cooling Chillers:
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When a new chilled water system is under consideration, but space is unavailable for a stand alone free cooler, one can be incorporated within an air-cooled chiller. They tend to be less efficient but worthy of consideration.
The principle of operation is the same, in that when the right ambient
conditions exist, the return water first passes through the free cooling
coil before entering the chiller.
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Images:
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Do you qualify for an interest free Energy Efficiency Loan?
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