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steps are taken. If the minimum temperature difference in the recuperator were changed from zero to some positive value (which would be necessary in a real application), the pinch-point region would increase. Figure 2.5 Recuperator effectiveness of a Brayton cycle without inter-cooling (top view) Figure 2.6 shows the temperature difference profiles for cycles operating with a turbine inlet temperature of 550oC and at the optimum pressure ratio. The pinch-point problem is clearly visible. Up to about 21 MPa the recuperator effectiveness for cycles operating at optimum pressure ratio is 1. That means no pinch-point problem. The minimum temperature difference exists at the cold end of the recuperator. However as the compressor outlet pressure increases past 21 MPa the highest efficiency and optimum pressure ratio for these pressures falls into the pinch-point region, where the recuperator effectiveness is less than 1. In Figure 2.6 it is identified by the complete change in the temperature difference profile. The minimum temperature difference (zero in our case) now exists somewhere within the recuperator, however the location is not fixed. 14PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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