The performance benefits gained with fogging systems compare favourably with those of evaporative cooling and air inlet chilling.

Both evaporative cooling and fogging are sensitive to ambient relative humidity. However, inlet air cooling potential is higher with fogging and absorption/chilling systems.

Fogging has the highest heat rate improvement of the three power augmentation technologies. Evaporative cooling is penalised by high air inlet pressure drop, while absorption/chilling suffers from high auxiliary load consumption.
The lowest capital cost is associated with fogging systems.

With an investment cost of less than USD50 per kilowatt of additional capacity, gas turbine inlet fogging represents the most cost-effective power enhancement technology.

This is mainly due to the fogging hardware design, which in most cases enables the nozzle array to be fitted without major modifications to the gas turbine air inlet system.

Fogging is the only system which can be installed without any problem as backfitting in one operational Gas Turbine.

The benefits of fogging apply in most locations. Use of the technology is not limited to hot and dry conditions. Most sites' ambient conditions allow sufficient potential for fogging systems to achieve simple payback in their first year of operation.

Fogging Evaporative Cooling Absorbers/Chilling
Output Up to 20% Up to 15% Up to 20%
Heat Rate Up to -2.5% Up to -2% Up to -2%
Maximum Humidity 100% <85% >100%
Installation Nozzle Racks Honey Comb Compressor + Expansion
Medium Demineralised Water Potable water Freezing absorber Mix
Cost $ $$ $$$

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