Which type of brine is not recommended for use in indirect cooling systems?

Sodium chloride is not recommended for use in indirect cooling systems primarily due to its corrosive properties. When sodium chloride is dissolved in water, it can lead to increased corrosion rates in the metal components of cooling systems. Over time, this can significantly accelerate wear and tear, leading to leaks or failures in the system.

In contrast, other options such as calcium chloride and potassium chloride may still be used in various applications, though they also have specific considerations regarding performance and compatibility. Ethylene glycol is typically used as a coolant in systems designed for lower freezing points and does not pose the same corrosion problems as sodium chloride. Therefore, based on the potential for corrosion and the impact it has on system longevity and maintenance, sodium chloride is not suitable for indirect cooling systems.