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performance. For the shape of the temperature profiles in the high and low temperature recuperators see Figure 6.20. 40 30 20 10 0 0 0.2 0.4 0.6 0.8 1 Fraction of Heat Transferred High temperature recuperator Low-temperature recuperator Tmax = 550 oC Pmax = 20 Mpa Tmin = 32 oC ra = 2.6 Total HX volume 120 m3 Figure 6.20 Temperature profile in the recuperators of the recompression cycle It should be stressed that in this section the recuperator geometries are not constant. They are re-optimized for every new main compressor inlet temperature. Therefore, the reduction of the effectiveness can also be a result of the change of heat exchanger geometry, which is described next. Figure 6.21 shows the optimum volume fractions for pre-cooler, high temperature recuperator and low temperature recuperator. As has been already mentioned these figures were developed for the reference heat exchanger volume of 120 m3 and these optimum volume fractions were developed to yield the highest efficiency achievable with this total heat exchanger volume. Figure 6.21 shows that the optimum value of pre- cooler volume fraction decreases. This is caused by two effects. The first is the reduction of the mean specific heat of CO2 in the pre-cooler, which leads to the increase of the mean temperature difference in the pre-cooler and thus improvement of the heat 132 Temperature Difference ( oC)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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