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GE Gas Turbine Performance Characteristics Inlet Cooling The ambient effect curve (see Figure 9) clearly shows that turbine output and heat rate are improved as compressor inlet temperature decreases. Lowering the compressor inlet tem- perature can be accomplished by installing an evaporative cooler or inlet chiller in the inlet ducting downstream of the inlet filters. Careful application of these systems is necessary, as con- densation or carryover of water can exacerbate compressor fouling and degrade performance. These systems generally are followed by mois- ture separators or coalescing pads to reduce the possibility of moisture carryover. As Figure 16 shows, the biggest gains from evap- orative cooling are realized in hot, low-humid- ity climates. It should be noted that evapora- tive cooling is limited to ambient temperatures of 59 F/15 C and above (compressor inlet tem- perature >45 F/7.2 C) because of the potential for icing the compressor. Information con- tained in Figure 16 is based on an 85% effective evaporative cooler. Effectiveness is a measure of how close the cooler exit temperature approaches the ambient wet bulb tempera- GT22419-1D ture. For most applications, coolers having an effectiveness of 85% or 90% provide the most economic benefit. Chillers, unlike evaporative coolers, are not lim- ited by the ambient wet bulb temperature. The achievable temperature is limited only by the capacity of the chilling device to produce coolant and the ability of the coils to transfer heat. Cooling initially follows a line of constant Psychrometric Chart (Simplified) 100% RH 40 35 .020 .015 Evaporative Cooling Process Specific Humidity .005 120.000 60% RH 30 Btu Per Pound of Dry Air 25 20 15 °F 40 .010 40% RH 20% RH Inlet Chilling Process 10% RH Dry Bulb Temperature °C4 16 27 38 49 60 80 100 GE Power Systems ■ GER-3567H ■ (10/00) 13 Figure 17. Inlet chilling process Figure 16. Effect of evaporative cooling on output and heat rate GT21141DPDF Image | GE Gas Turbine Performance Characteristics
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