NEWS CENTER
Oasis Iceberg
12
2024
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07
How do you choose the coil for a closed-circuit cooling tower?
A closed-circuit cooling tower (also known as an evaporative air cooler or a closed-type cooling tower) features a tubular heat exchanger housed within the tower. It achieves cooling by facilitating heat exchange between circulating water, spray water, and flowing air. Because it operates in a closed-loop system, it ensures that the water quality remains uncontaminated, effectively safeguarding the efficient operation of the main equipment and extending its service life. When ambient temperatures are relatively low, the spray-water system can be shut down, thereby conserving water. With the implementation of national energy-saving and emission-reduction policies and the growing scarcity of water resources, closed-circuit cooling towers have seen widespread adoption in recent years across industries such as iron and steel metallurgy, power electronics, mechanical processing, and air-conditioning systems.
A closed-circuit cooling tower (also known as an evaporative air cooler or a closed-type cooling tower) places a tubular heat exchanger inside the tower. It achieves cooling by leveraging the heat exchange between circulating water, spray water, and flowing air. Because it operates in a closed-loop system, it ensures that the water quality remains uncontaminated, effectively protecting the main equipment from damage and enhancing its operational efficiency and service life. When ambient temperatures are low, the spray-water system can be shut down, thereby conserving water. With the implementation of national energy-saving and emission-reduction policies and the growing scarcity of water resources, closed-circuit cooling towers have seen widespread adoption in recent years across industries such as iron and steel metallurgy, power electronics, mechanical processing, and air-conditioning systems.
Currently, there are three commonly used materials for the coil in closed-circuit cooling towers: carbon steel pipe, stainless steel pipe, and copper pipe. However, since carbon steel pipes have a relatively short service life, they are used less frequently. Copper pipes and stainless steel pipes, on the other hand, are more common. Given the significant price differences among these three coil materials, many companies take cost considerations into account when selecting a closed-circuit cooling tower and choose different cooling coils accordingly.
(Pictured is a brass pipe)
(The accompanying image shows a 304 stainless steel pipe.)
A few suggestions from closed-circuit cooling tower manufacturers regarding the selection of coil materials:
1. Based on the long-term usage requirements of cooling tower customers, we recommend selecting copper pipes and stainless steel pipes first, as they have a long service life and can withstand a wider range of operating environments. Even in many environments with weak acidity or weak alkalinity, they still exhibit excellent corrosion resistance and durability.
2. If you choose carbon steel pipes, we recommend asking the manufacturer to galvanize the carbon steel pipes. Although galvanizing does not significantly increase the cost of using the coil, it can indeed greatly extend its service life. However, this method is incomparable to the service life of copper pipes and stainless steel pipes—it simply isn't comparable.
3. If there are stringent requirements for water quality and water channels, we recommend using stainless steel pipes, as the oxide layer on the surface of stainless steel pipes is more dense, preventing water from accumulating on the surface. Even with long-term use, this will not result in significant scale buildup, which could otherwise affect water quality and the heat dissipation capacity of the coil.
4. If faster heat dissipation is required, our manufacturer would recommend using copper tubes, as copper tubes typically have wall thicknesses ranging from 8 to 10 mm. With their relatively thin walls, copper tubes offer higher thermal conductivity and thus better performance. However, one drawback is that the scale buildup on the surface needs to be cleaned regularly, since scale tends to form relatively quickly on the surface of copper tubes.
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