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that an additional 3% of the gross specific power will be consumed for these loads. For the 600 MWth plant 3% constitutes about 8 MWe. The cycle net electric power is thus 246 MWe. The thermal efficiency was thus reduced by ~ 4.3% to give the value of the net efficiency. This is a significant efficiency reduction, emphasizing the importance of taking into account losses which are not part of the thermodynamic analyses. This clearly demonstrates that failure to do so will lead to a significant efficiency, and thus electric power, overprediction. Since the electric power is an important parameter for the capital cost ($/kWe) calculation if the value of the net efficiency is not precise the whole economic assessment is biased. This approach was adopted for all the selected cycle designs to calculate the net efficiencies, which were presented in Table 10.1. 10.3 Supercritical CO2 Power Conversion Unit Layout It has been pointed out several times in this work that the supercritical CO2 cycle is extremely compact. To prove this point a power cycle layout was developed and will be presented here. The heat exchanger dimensions calculated for the basic design using conservative turbomachinery are used. The power conversion unit design is based on the General Atomics/Russian design of the helium Brayton cycle GT-MHR. All the major components of the power cycle are placed within a single vessel since the power cycle boundary is part of the barrier against the escape of fission products. 10.3.1 Recuperators The optimized design of recuperators for the basic design is presented in Table 10.6. Both types are PCHE designs with straight channels having a semicircular channel diameter of 2 mm. The recuperators were designed to fit in the power conversion unit vessel. Each recuperator consists of four modules, which together make up a cylindrical shape. Each module occupies one quarter of the cylinder. The detailed design and flow path of one module are shown in Figure 10.2. In this picture the volume required for the headers has been added. The final dimensions of heat exchangers are thus 2.15m and 2.45m for the high and low temperature recuperators, respectively. 232PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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