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As pressure drops of the re-heater are likely to fall between 65 and 125 kPa, this figure also shows the band of possible efficiency improvements. 4.2.2 Inter-cooled Brayton Cycle Another way of improving the cycle efficiency is through the introduction of inter- cooling. Inter-cooling helps by reducing the average temperature of the heat rejection from the cycle. The outlet and inlet compressor temperatures should be the same in order to achieve the maximum benefit from inter-cooling. This strategy works well for the Brayton cycles that use ideal gas. Given that the compressors operate close to the critical point it may be difficult to apply inter-cooling. As was shown in the case of the turbine the optimum pressure ratio split for the turbine is 1 to 1 even though it was observed that a slightly lower value yields the maximum efficiency. This was caused by the fact that the effect of real gas properties on the turbine is very low and thus the departure from the 1 to 1 value of the pressure ratio split is very small. In the case of the compressor this is not the case since the properties of CO2 are significantly affected by the critical point and thus in order to achieve the same compressor outlet temperatures the pressure ratio split is not equal. The investigated cycle layout is shown in Figure 4.28. INTERCOOLER 2 3 4 8 7 6 5 RECUPERATOR TURBINE GENERATOR COMPRESSORS 1 PRECOOLER Figure 4.28 Inter-cooled Brayton cycle layout 100 REACTORPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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