Supercritical Carbon Dioxide Cycle Analysis

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Supercritical Carbon Dioxide Cycle Analysis ( supercritical-carbon-dioxide-cycle-analysis )

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1 ln𝑑2𝑑1 ln𝑑3𝑑2 1 −1 𝑞′ = 𝜋𝑑1𝑕𝑁𝑎 + 2𝜋𝑘𝑝𝑖𝑝𝑒 + 2𝜋𝑘𝑖𝑛𝑠 + 𝜋𝑑3𝑕𝑎𝑖𝑟 (450 oC) Eqn. 4-1 where 𝑑1, 𝑑2, and 𝑑3 are the pipe inside diameter, pipe outside diameter, and the insulation outside diameter, respectively. The thermal resistance of the insulation is the dominant term in Eqn. 4-1, contributing about 91 % of the resistance even for the thinnest insulation of just 1 cm. Using the Clinch River Breeder Reactor (CRBR) as an example shows that the temperature changes in the intermediate loop are negligible. CRBR was chosen as an example because it is matches the ABR-1000 closely in intermediate loop mass flow rate and temperatures. It also has the highest intermediate loop pumping power of any SFR, so it is a conservative example. The temperature drop in the intermediate loop from points 2 to 3 is determined by calculating the heat transfer to the atmosphere. Representative values used in Eqn. 4-1 are given in Table 4.1. From Core To PCS 2 S-IHX 1 From PCS P-IHX 3 To Core 4 Figure 4.1: Schematic of the intermediate loop. The P-IHX could be incorporated in a loop design (as pictured) or submerged within a pool of primary coolant. 84

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