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constant the effect on efficiency was almost 0.9%. More importantly the efficiency reduction is much steeper when not enough pre-cooler volume is provided. Therefore, one should pay attention to the design of the pre-cooler, which is usually neglected, as more attention is given to the recuperator. The pre-cooler is a significant contributor to the overall plant efficiency, especially in the case of the supercritical CO2 cycle as the cooling water pumping power requirements can significantly compromise the overall plant efficiency. 40 39 38 37 36 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -1.2 -1.4 -1.6 -1.8 -2 Net efficiency Efficiency reduction 1 1.5 2 2.5 3 Recuperator length (m) Figure 4.11 Effect of recuperator length on cycle efficiency The optimization of the pre-cooler length is much more important than the correct volume split between the recuperator and pre-cooler. As shown in Figure 4.10 failure to optimize the precooler length can lead to the reduction of cycle efficiency by more than 2%. If the pre-cooler length is high its fractional pressure drop significantly increases, which reduces the cycle efficiency. On the other hand having too short a pre-cooler causes its effectiveness to drop significantly, which results in a steep increase of the cooling water mass flow rate demand. Thus, the pre-cooler pumping power requirements are very high, which penalizes the cycle efficiency even more. Pre-cooler length has the 84 Efficiency (%) Efficiency reduction (%)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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