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efficiencies for the same sum of the pressure drops. Thus the sum of the pressure drops of the intermediate heat exchanger and the re-heaters does not give a definite answer as to what will be the value of the cycle efficiency. Therefore, the single formula that was used in the case of the recompression cycle cannot be applied here. To evaluate the efficiency a linear interpolation between the calculated values was used. Linear interpolation is also used to evaluate the other parameters needed for the evaluation of the intermediate heat exchangers and the re-heaters (i.e. mass flow rate of CO2 and component fractional pressure drops). 6.8 Summary This chapter described the optimization and performance analysis of the supercritical CO2 recompression cycle, which was found to be the most promising cycle layout in Chapter 5 and was selected as the reference cycle layout for the rest of this work. The optimization uses the methodology that was developed in Chapter 4. The optimized parameters in this case are: the pressure ratio, the ratio of pre-cooler volume to the total volume of recuperators, the ratio of the high temperature recuperator volume to the low temperature recuperator volume, the pre-cooler length, the high temperature recuperator length and the low temperature recuperator length. There are six parameters that need to be optimized compared to the four in the case of the simple supercritical CO2 Brayton cycle. Therefore, the optimization is much more complex. The first analysis evaluated the effect of pressure ratio on the cycle performance if the heat exchanger design is fixed. In the case of the recompression cycle there are two compressors working in parallel. Therefore, the flow split between these two compressors is an important cycle parameter, mainly because in the case of off-design- point operation the flow rate through the compressor is an important parameter that affects the compressor performance. If the deviation is too large the compressor can stall or surge. It was found that if the pressure ratio changes the flow split changes as well. This causes the cycle efficiency to drop quickly if the cycle operates away from its optimum pressure ratio. The rest of the section described the effect of pressure ratio on 153PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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