PARAMETRIC APPRAISAL OF THE PERFORMANCE OF A GAS TURBINE UTILIZING COMPARATIVE BREAKDOWN OF THE PERFORMANCE CRITERIA

Abstract

This paper presents the parametric appraisal of the performance of a gas turbine utilizing comparative breakdown of the performance criteria. The investigation took thirteen months during which logsheets used for the operations studied and direct measurements performed as well. The results gave the average of each of the performance criteria as follows: thermal efficiency - 24.19%, work ratio - 0.855, TDI - 3.13, NPHR - 14.90MJ/KW and net work ratio - 0.25. There is, thus, significant correspondence with the respective design values: 26.6% ,0.4-0.8,3.42, 10-20MJ/KW and 0.25. It further shows that a 1oC rise in the ambient temperature would cause 0 – 0.054 decrease in the work ratio, 0 – 0.42 increase in the thermal discharge index, 0 – 1.51MJ/kW increase in the net plant heat rate , 0 – 0.04 decrease in the net work ratio and 0 – 2.45% decrease in the actual thermal efficiency. The variation of thermal discharge index with ambient temperature shows that maintaining a maximum ambient temperature of 29oC would reduce thermal energy thereby contributing to the reduction of the depletion of the ozone layer.