What is the effect of entrained air in cooling water and how itis removed?

Answer 1

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Answer 2

Entrained air in cooling water can have several negative effects on cooling system performance:

Reduced Heat Transfer Efficiency: Air bubbles in the cooling water can form a barrier between the water and the surface being cooled, reducing the efficiency of heat transfer. This can result in inadequate cooling of equipment, leading to decreased performance and potential overheating.

Corrosion: Entrained air can promote corrosion within the cooling system by causing localized oxygen concentration cells. This can accelerate the degradation of metal surfaces, leading to increased maintenance requirements and potential equipment failure.

Pump Cavitation: Air bubbles passing through pumps can cause cavitation, which is the formation of vapor bubbles and subsequent collapse, leading to erosion of pump components and reduced pump efficiency.

To remove entrained air from cooling water, various methods can be employed:

Degassing: Degassing systems are designed to remove dissolved gases, including entrained air, from the cooling water. This can be achieved through processes such as vacuum degassing, where the water is subjected to reduced pressure to allow gases to escape.

Air Separators: Air separators, such as air vents or air eliminators, are installed in the cooling system to physically separate and remove air from the water. These devices typically utilize gravity or centrifugal force to separate the air bubbles from the water stream.

Venting: Manual or automatic venting systems can be installed at high points in the cooling system to allow trapped air to escape. Automatic venting systems use float-operated valves to release air as it accumulates in the system.

Chemical Treatment: Chemical additives can be used to help release entrained air from the water or to prevent the formation of air bubbles. These additives may include surfactants or antifoaming agents.

By effectively removing entrained air from the cooling water, these methods help improve heat transfer efficiency, reduce corrosion, and prevent pump cavitation, ultimately optimizing the performance and reliability of the cooling system.