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However, since experience with CO2 up to 650oC is available (AGR units) it was decided to evaluate the cycle potential at 650oC as well, as an advanced design. In addition a high-performance design at 700oC for future application will also be explored. In the case of the compressor outlet pressure the efficiency benefit caused by its increase is not linear. As the compressor outlet pressure increases the efficiency improvement saturates. This indicated that there are two effects. One is the thermodynamic optimum of the cycle and the second is the reduction of the cycle fractional pressure drops. It was found that increasing the pressure from 25 to 30 MPa yielded less than a percent efficiency improvement. 25 MPa seems to be the optimum operating pressure, however since at 20 MPa the efficiency reduction compared to 25 MPa was about 1.3% and since there is much more operating experience at pressures below this value it was decided to use 20 MPa as the reference compressor outlet pressure. This leaves room for further efficiency improvements in the future if the cycle proves attractive. Since all the analyses were performed for a constant pressure drop of the reactor system of 500 kPa the effect of this pressure drop on the cycle was investigated. It was found that by completely eliminating the pressure drop (from 500 to 0 kPa) the efficiency is improved by about 1.5%, and the dependence on the pressure drop is linear. Therefore, for the reference cycle design one should estimate the reactor system pressure drop and take advantage of the available efficiency improvement (Chapter 10). In this section the regressions for efficiency and other parameters needed for indirect cycle design were also developed. The last topic investigated was the effect of re-heat on the performance of the recompression cycle. The first stage of re-heat introduces about 1.2% efficiency improvement, while the second one only about 0.5% additional benefit. Since re-heating is practical only in the case of an indirect cycle its benefit on the plant cost will be investigated in Chapter 7. 155PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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