By A M Y Razak
Read Online or Download Industrial gas turbines: Performance and operability PDF
Similar machinery books
This e-book offers a complete examine business compressors. Readers can discover a good deal of data in accordance with lengthy business event, on a transparent and well-founded method of real-gas dealing with, and on ideas to many sensible difficulties. "Process Centrifugal Compressors" provides engineering contractors and clients of commercial compressors with a greater perception into the "how" and "why" of other layout positive factors, therefore offering a superb foundation for facing brands.
A whole, cutting-edge advisor to the layout, purposes, and upkeep of valves and actuators. Todays creation techniques contain new and unique fluids, severe pressures and temperatures, and more and more refined electrical and digital method keep watch over expertise. What new valves and actuators can be found to satisfy the demanding situations dealing with mechanical designers, process/control engineers, and upkeep group of workers?
Additional resources for Industrial gas turbines: Performance and operability
8 Heat transfer for a regenerative gas turbine cycle. 25] where P c= 2 P1 γ –1 γ and T4 is now the maximum cycle temperature. Unlike the simple cycle, the thermal efficiency of the regenerative cycle is dependent on the cycle temperatures, particularly the ratio of the maximum to minimum temperature ratio, T4/T1. The effect of the pressure ratio on the thermal efficiency is opposite to that for a simple cycle gas turbine. The thermal efficiency of the regenerative cycle increases as the pressure ratio decreases and, when the pressure ratio tends to unity, the thermal efficiency tends to that of the Carnot cycle efficiency, 1 – T1/T4.
Since lines of constant pressure diverge on the temperature–entropy diagram, Σ ∆Ts′ will be greater than ∆T ′. 3 If more stages are added to the compressor, then the difference between these two efficiencies will also increase. However, the increase in the number of stages will also increase the pressure ratio of the compressor. Thus the decrease in compressor isentropic efficiency with pressure ratio is observed as shown in Fig. 11. 12 Polytropic process of a multi-stage compressor. © 2007 by Taylor & Francis Group, LLC Thermodynamics of gas turbine cycles 31 Similarly, it can be shown that, for a turbine, the isentropic efficiency will increase with pressure ratio and this is due to the reheating of the gas entering the next turbine stage due to the losses in the previous stage.
If enough heat is supplied such that the turbine work is just sufficient to drive the compressor (cp(T3 – T4) = cp(T2 – T1)), the net work output and the thermal efficiency will be zero because a finite amount of heat has to be supplied (Fig. 13(b)). e. T3 increases to T3′), then the thermal efficiency and the specific work output will also increase. 13 (a) and (b) Effect of irreversibilities on temperature–entropy. © 2007 by Taylor & Francis Group, LLC 32 Industrial gas turbines – principles of performance the simple cycle gas turbine performance also depends on T3 and improves as T3 increases.