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Advantages

• power saving (no power consumption to induce air flow- no fan)
• environmentally friendly
• no mechanical noise (no fan)
• safety of operation
• no recirculation as the plume is rejected at high level
• limited plot area
• limited maintenance
• high longevity (generally more than plant life expectancy)
• Payback period between 8 and 16 years depending on several factors

The main one is the local construction cost.

References: more than 235 natural draft cooling towers worldwide