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Effects of the Intake Air Humidity on the Gas Turbine Performance Monitoring

[+] Author Affiliations
Houman Hanachi, Jie Liu

Carleton University, Ottawa, ON, Canada

Avisekh Banerjee, Ying Chen

Life Prediction Technologies Inc., Ottawa, ON, Canada

Paper No. GT2015-43026, pp. V006T05A018; 8 pages
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy; Honors and Awards
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5675-8
  • Copyright © 2015 by ASME


Gas turbine engines (GTEs) are extensively used in locations with high humidity such as offshore platforms. However, in the dry regions, GTEs are often equipped with water spray inlet coolers for warm seasons. In both cases, the moisture affects the thermodynamic properties of the intake air and drifts the performance off the dry condition, especially during the warm days, when the moisture content of the air is high and the inlet air cooler is operational. In this paper, a detailed steady state model is proposed to simulate the GTE performance with the humid air, and it is linked with a thermodynamic model to quantify the total moisture content of the air after the cooler. The developed framework is used to analyze the operating data of a GTE during the three years of service. The results are then utilized for model-based performance monitoring of the GTE, using a recently introduced performance indicator. A comparative analysis is performed between the results received from the primary model overlooking the humidity effects, and the developed enhanced performance model with humidity effects. A better accuracy for the performance indicator was observed where the enhanced model is employed, suggesting the importance of considering the intake air humidity for model-based performance monitoring.

Copyright © 2015 by ASME
Topics: Gas turbines



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