Inlet fogging of gas turbine engines has attained considerable popularity due to the ease of installation and the relatively low first cost compared to other inlet cooling methods. With increasing demand for power and with shortages envisioned especially during the peak load times during the summers, there is a need to boost gas turbine power. There is a sizable evaporative cooling potential throughout the world when the climatic data is evaluated based on an analysis of coincident wet bulb and dry bulb information. These data are not readily available to plant users. In this paper, a detailed climatic analysis is made of 106 major locations over the world to provide the hours of cooling that can be obtained by direct evaporative cooling. This data will allow gas turbine operators to easily make an assessment of the economics of evaporative fogging. The paper also covers an introduction to direct evaporative cooling and the methodology and data analysis used to derive the cooling potential. Simulation runs have been made for gas turbine simple cycles showing effects of fogging for a GE Frame 7EA and a GE Frame 9FA Gas turbine for 60 and 50 Hz applications.

Chaker, M., Meher-Homji, C. B., Mee, T., and Nicolson, A., 2001, “Inlet Fogging of Gas Turbine Engines—Detailed Climatic Analysis of Gas Turbine Evaporative Cooling Potential,” ASME Paper No. 2001-GT-526.
McNeilly, D., 2000, “Application of Evaporative Coolers for Gas Turbine Power Plants,” ASME Paper No. 2000-GT-303.
Kitchen, B. J., and Ebeling, J. A., 1995, “QUALIFYING Combustion Turbines for Inlet Air Cooling Capacity Enhancement,” ASME Paper No. 95-GT-266.
Tawney, R., Pearson, C., and Brown, M, 2001, “Options to Maximize Power Output for Merchant Plants in Combined Cycle Applications,” ASME Paper No. 2001-GT-0409.
Jones and Jacobs, 2000, “Considerations for Combined Cycle Performance Enhancement Options,” GE Publication GER-4200.
Johnson, R. S., 1988, “The Theory and Operation of Evaporative Coolers for Industrial Gas Turbine Installations,” ASME Paper No. 88-GT-41.
Meher-Homji, C. B., and Mee, T. R., 1999, “Gas Turbine Power Augmentation by Fogging of Inlet Air,” Proceedings of the 28th Turbomachinery Symposium, Turbomachinery Laboratory, Texas A&M University, Sept., Houston, TX.
Meher-Homji, C. B., and Mee, T. R., 2000, “Inlet Fogging of Gas Turbine Engines—Part A: Theory Psychrometrics and Fog Generation and Part B: Practical Considerations, Control and O&M Aspects,” ASME Paper Nos. 2000-GT-307; 2000-GT-308.
Bhargava, R., and Meher-Homji, C. B., 2002, “Parametric Analysis of Existing Gas Turbines With Inlet Evaporative and Overspray Fogging,” ASME Paper No. 2002-GT-30560.
Ingistov, S., 2000, “Fog System Performance in Power Augmentation of Heavy Duty Power Generating Gas Turbines GE Frame 7EA,” ASME Paper No. 2000-GT-305.
Utamura, M., Ishikawa, A., Nishimura, Y., and Ando, N., 1996, “Economics of Gas Turbine Inlet Air Cooling System for Power Enhancement,” ASME Paper No. 96-GT-515.
Ondryas, I. S., “Options in Gas Turbine Power Augmentation Using Inlet Air Chilling,” ASME Paper No. 90-GT-250.
Van Der Linden, S., and Searles, D. E., 1996, “Inlet Conditioning Enhances Performance of Modern Combined Cycle Plants for Cost-Effective Power Generation,” ASME Paper No. 96-GT-298.
Guinn, G. R., 1993, “Evaluation of Combustion Gas Turbine Inlet Air Precooling for Time Varying Annual Climatic Conditions,” ASME Gogen-Turbo 1993, Bournemouth, UK, Sept. 21–23, IGTI, Atlanta, 8.
You do not currently have access to this content.