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Chilled Water System
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Qatarat Water for Trading Co.
Jeddah, Saudi Arabia
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The chilled/closed water loop transfers heat between AHU/FCU and the chiller. The term “closed loop” seldom means that the chilled water is free from contamination or bacteria. Depending on the incoming water, minerals will be deposited in the system over time. Bacteria are present everywhere and can also enter the closed loop. Thus, it is important for chilled water systems to be commissioned and treated well, aiming to prevent loss of heat transfer due to fouling, scale, or corrosion, and aiming to prevent damage to major equipment such as AHU/FCU, sensors, thermometers, motorized valves, and pumps.Although the low temperature is not conducive for Legionella bacteria, other bacteria including iron bacteria still prevail. Therefore, sufficient care must be taken to ensure occupants’ health and reduce the corrosion risk.

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