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Thermodynamic assessment of impact of inlet air cooling techniques on gas turbine and combined cycle performance

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  • Mohapatra, Alok Ku
  • Sanjay,

Abstract

The article is focused on the comparison of impact of two different methods of inlet air cooling (vapor compression and vapor absorption cooling) integrated to a cooled gas turbine based combined cycle plant. Air-film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor pressure ratio, compressor inlet temperature (Ti,C), turbine inlet temperature (Ti,T), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. Optimum Ti,T corresponding to maximum plant efficiency of combined cycle increases by 100 °C due to the integration of inlet air cooling. It has been observed that vapor compression cooling improves the efficiency of gas turbine cycle by 4.88% and work output by 14.77%. In case of vapor absorption cooling an improvement of 17.2% in gas cycle work output and 9.47% in gas cycle efficiency has been observed. For combined cycle configuration, however, vapor compression cooling should be preferred over absorption cooling in terms of higher plant performance. The optimum value of compressor inlet temperature has been observed to be 20 °C for the chosen set of conditions for both the inlet air cooling schemes.

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  • Mohapatra, Alok Ku & Sanjay,, 2014. "Thermodynamic assessment of impact of inlet air cooling techniques on gas turbine and combined cycle performance," Energy, Elsevier, vol. 68(C), pages 191-203.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:191-203
    DOI: 10.1016/j.energy.2014.02.066
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    5. Comodi, G. & Renzi, M. & Caresana, F. & Pelagalli, L., 2015. "Enhancing micro gas turbine performance in hot climates through inlet air cooling vapour compression technique," Applied Energy, Elsevier, vol. 147(C), pages 40-48.
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