Design Guide: Combustion Turbine Inlet Air Cooling Systems
Providing users with an understanding of the benefits and limitations, this guide assists in the successful design and implementation of a combustion turbine inlet air cooling system.
TABLE OF CONTENTS Design Guide: Combustion Turbine Inlet Air Cooling Systems
Chapter 5: Inlet Air Cooling Implementation
Combustion turbine inlet cooling can be as simple as buying new packaged combustion turbine and cooling equipment from (he turbine manufacturer. For new or installed turbines without inlet air cooling, the cooling system will need to be designed and installed and the performance verified.
5.1 Preliminary Evaluation
The benefits of CTIAC were discussed in Chapters 2 and 3 as either the effectiveness or performance index benefit factors. The performance index can be used to assess the probability of success as the change in turbine capacity increase with a unit change in inlet air temperature. This is the slope of the plot of capacity with inlet air temperature, or d(kW)/ dT. Since the slope is nearly always linear, the slope is approximately ?kW/ ?T, or the change in work capacity divided by the temperature change, ?W/ ?T. When divided by the mass flow rate of the inlet air, this ratio is essentially the performance index. The larger the slope of the capacity increase with temperature, the larger the value of performance index and the greater the potential benefit of CTIAC.
The smaller the airflow per unit of generating capacity for newer combustion turbines, the smaller the capacity of cooling equipment required, as is also reflected in the definition of performance index, given again here as the increase in turbine work divided by the air mass flow rate and change in air enthalpy,
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Smaller values of inlet air mass flow rates for newer turbines and...
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