Hybrid Cooling Towers are excellent for water conservation. Hybrids use a combination of traditional styles of water cooled and air cooled systems together. Water to be cooled is first passed through a dry air section then through a wet section, which makes this type very adaptable to temperature in the sense that when the weather is cool, only the dry section is used – reducing water consumption considerably.
To give indicative water saving, an open cooling tower would cost $20,000 in water costs per year as opposed to a Hybrid costing only $5,000 per year. As you can see, the original outlay of a hybrid cooling tower can be quickly offset by reducing water costs.
Why should we use Hybrids?
- Eliminate the risk of Legionella
- Lower water consumption (reduced by 75%)
- No water treatment chemicals required
- Compliancy is no longer an issue (RMPs & regular audits)
- Wet water cooling towers in high energy physics facilities are state of the art. The advantages are robustness, effectiveness and cost-effectiveness. The return water temperature is lower than the air temperature due to cooling via evaporation. The disadvantages are the high water consumption, which becomes more costly in the future and the soiling of the heat exchangers. If the water source is taken from wells then the drawdown of the ground water level has to be taken into account. A hybrid dry cooler is a combination of a dry air cooler during cold and moderate seasons and additional wet cooling during the hot summer season. The cooling surface is moistening by adding water to increase the cooling capability by a factor of 250%. By this the hybrid dry cooler saves a lot of water. The water consumption can be reduced by 80% compared to a wet cooling system. This contribution presents the consumption and the requirement of the make-up water and an estimate of the behavior of the temperature control.
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