Water-cooled chiller systems have a cooling tower, thus they feature higher efficiency than air-cooled chillers.
Water-cooled chillers are more efficient because they condense depending on the ambient temperature bulb temperature, which is lower than the ambient dry bulb temperature. The lower a chiller condenses, the more efficient it is.
This system has several essential components including:
Condenser water pumps
Make-up water pumps
What are the benefits of a water-cooled chiller?
Some users may prefer these chillers because of the smaller size they occupy as compared to air-cooled chillers. These chillers also feature higher efficiency and last longer than the mentioned alternative. Those who would like the equipment to be placed indoors may find the water-cooled machine desirable.
AIR COOLED CHILLER
Where aesthetics and environmental conditions or water access restrictions exist, air-cooled chiller may be applied. Both air-cooled and water-cooled chillers depend on an air stream as a means of heat transfer.
The difference is that the water-cooled chillers or rather the cooling towers use a humid air stream (ambient air stream + water spray) while the air-cooled chillers use a current of ambient air.
Normally water-cooled chillers are cheaper and more efficient, with the disadvantage of high water consumption.
ARANER has found a way of combining modern manufacturing methods and advanced technology to achieve highly effective and efficient air-cooled chillers.
Owing to that, the company’s chiller plants are very competitive to water chilled chillers in different aspects. For example, these plants are very impressive in terms of footprint, efficiency and noise.
Unfortunately, some people still believe that air cooled chillers cannot offer quite good efficiencies. What such people only need to check is the performance of these chillers two decades ago is the progressive increase in NPLV rating of air-cooled chillers over the years.
In summary, here are the benefits of using air-cooled chillers:
No cooling towers
Better environmental stability-no water wastage
Low maintenance costs
Easier to operate and control-tower freezing and tower bypass absent
Chemical costs avoided
Water costs avoided, especially in cities
No water problems to deal with in case of disaster
HOW DO I CHOOSE BETWEEN THE TWO?
The cooling capacity is the main guideline for the choice of chiller. Equally crucial is the balance between operating costs and capital costs.
Some clients will base their buying decision on initial cost. However, a value-based option considers both operational cost and initial cost. To determine the initial cost of each option, add the costs for both contractor and equipment. For the water-cooled chiller, remember to add cooling tower.
When it comes to life cycle cost, you have to consider both purchase cost and operating cost.
When you evaluate each of the two chillers this way, you are able to determine its total cost. What you must note is that water-cooled chillers normally appear more valuable if you ignore first cost and water cost. However, it is only after you look at the broader costs that the true picture appears clearly.
Energy cost remains a major consideration in any powered equipment. Energy saving measures are being implemented everywhere.
While the chiller has direct impact on energy usage, there are other factors to consider. While the water-cooled chiller may be more energy efficient, it receives stiff competition from air-cooled chiller in terms of installation cost, maintenance cost, number of equipment and several other aspects.
Most importantly, air cooled chillers avoid water consumption so they are ideal alternative in areas with water scarcity or areas with cheap energy but costly water fees.
Have you made your choice already?
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