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The partial cooling cycle achieves the highest thermal efficiency 43% for turbine pressure ratio 3.0; moreover, when the turbine pressure ratio exceeds 2.7 further increasing of the ratio has only slight effect on the efficiency. Interesting is pre-compressor improvement – about four percentage point to the simple Brayton cycle. Improved regeneration has very limited turbine pressure ratio operating range and the thermal efficiency characteristic does not exceed the others. Recompression and split expansion cycles have identical trend as due to their similarity, but achieved thermal efficiency falls behind the others. 0,50 0,48 0,46 0,44 0,42 0,40 0,38 0,36 Brayton Split expansion Precompression Recompression Partial cooling Improved regeneration 2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8 4 Turbine Pressure Ratio [-] Figure 2.2 Results of analysis for turbine inlet pressure 15MPa Improved regeneration exceeds the partial cooling only for special condition – in this case for turbine pressure ratio 3.3 and 3.4, when the value of thermal efficiency is more than 45%. For turbine pressure ratio between 2.0 and 2.5 the re-compression cycle performs the best since pre-compression achieves similar thermal efficiency for the ratio from 2.6 to 3.2. 0,50 0,48 0,46 0,44 0,42 0,40 0,38 0,36 Brayton Recompression Split expansion Partial cooling Precompression 2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8 4 Turbine Pressure Ratio [-] Figure 2.3 Results of analysis for turbine inlet pressure 20MPa Thermal Efficiency [-] Thermal Efficiency [-]PDF Image | 2009 TECHNOLOGY INNOVATION WINNERS
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