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6 Thermodynamic Analysis of Recompression Cycle 6.1 Introduction Chapter 5 pointed out the advantage of compound cycles over the normal Brayton cycle and indicated that the recompression cycle has the biggest potential for efficiency improvement among the investigated cycles. This chapter investigates the performance of the recompression cycle in detail in order to optimize its design and operating conditions that will be used for the reference cycle design. The recompression cycle layout is shown in Figure 6.1. This cycle layout improves efficiency by reducing the heat rejection from the cycle by introducing another compressor (a recompressing compressor) before the pre-cooler. The flow is split before entering the pre-cooler and heat is rejected only from part of the fluid flow. The outlet of the recompressing compressor is connected between the high and low temperature recuperators. This is another difference from the simple Brayton cycle where only one recuperator is used. Otherwise, the cycle is the same. In the main compressor (points 1 – 2) a fraction of the fluid flow is compressed to high pressure. In the low temperature recuperator it is preheated to the recompressing compressor outlet temperature (points 2 – 3). Then the fluid is merged with the rest of the fluid flow from the recompressing compressor (point 3). The entire fluid flow is then preheated in the high temperature recuperator to the reactor inlet temperature (points 3 – 4). The heat addition into the cycle takes place in the reactor (points 4 – 5). The fluid leaves the reactor at the highest cycle temperature. At this temperature it enters the turbine, where fluid expansion (points 5 – 6) generates rotational energy, which is converted into electricity in the generator. After leaving the turbine the high temperature fluid is cooled in the high (points 6 – 7) and low (points 7 – 8) temperature recuperators, where the available heat is transferred to the cooler high pressure side fluid flow. Before entering the precooler the fluid flow is split (point 8). One part is recompressed to high pressure (points 8 – 3), the other is cooled in the precooler to the main compressor inlet temperature (points 8 – 1). The temperature entropy diagram of the recompression cycle is shown in Figure 6.2. 114PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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