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50 Gas Turbine Handbook: Principles and Practices Turbine Efficiency Tracking or trending turbine efficiency would be an excellent method to monitor the health of a unit. However, as turbine inlet temperatures (TIT) have climbed higher and higher, they have become virtually impossible to measure on a long term basis. In fact, many manufacturers measure an intermediate turbine temperature for gas turbine control. Where this is the case the turbine inlet temperatures are calculated. η t = 1–T EXH TIT s 1–R t (4-14) where T EXH = Turbine total exhaust temperature, °R TIT = Turbine total inlet temperature, °R R t = Turbine total inlet pressure/Turbine total exhaust pressure Turbine efficiency can be closely approximated by substituting 1 R c = R t η t = 1– T EXH TIT 1– 1 R c σ (4-15) Turbine Horsepower (Produced) This is the total horsepower produced by the turbine. It includes the horsepower to drive the compressor and, for single shaft machines, the power used by the driven load. For units with separate power turbines, this horsepower should equal the power absorbed by the compressor plus losses.
Gas Turbine Systems Theory 51 HP t = J 550 W gc p η t T i 1– P o P i σ = J 550 W gc p T i 1– T o T i (4-16) where W g = Turbine inlet gas flow, lbs/sec c p = Specific heat at constant pressure, Btu/lb °F η t = Gas generator turbine adiabatic efficiency P o = Gas generator discharge total pressure, psia P i = Turbine inlet total pressure, psia T o = Gas generator discharge total temperature, °R T i = Turbine inlet total temperature, °R Power Turbine Efficiency Decreases in power turbine efficiency are primarily the result of loss of material due to erosion, corrosion, or foreign object damage. η PT = 1– T o T i 1– P AMB P i σ (4-17) where T i = Power turbine inlet total temperature, °R T o = Power turbine discharge total temperature, °R = Atmospheric total pressure*, psia P AMB Power Turbine Horsepower On free power turbines units, this is the horsepower generated to drive the driven load. HP PT = J 550 W gc p T i η PT 1– P AMB P i σ (4-18) *Simple Cycle Gas Turbine Application. For combined cycle applications, or any application resulting in significant exhaust duct backpressure, it is more accurate to use P out instead of P AMB .
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Gas Turbine Handbook: Principles an
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Gas Turbine Handbook: Principles an
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Dedication This book is dedicated t
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Contents PREFACE ..................
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Chapter 13—BOROSCOPE INSPECTION .
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Preface to the Third Edition The ne
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100 Gas Turbine Handbook: Principle
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Chart 8-1 Gas Turbine Environments
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Appendix A-2 304 Gas Turbine Handbo
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5. Weather Hood Material __________
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Appendix C-6 Air/Oil Cooler Specifi
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9. Drive Requirements A. Hydraulic
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22. Packaging For Shipment Per Spec
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Parameters Units NH 3 CO H 2 CH 4 C
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.055 Parameters Units 1/0 .88/.12 .
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Koppers Foster Blue Coal Gas Winkle
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