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of both recuperators, the turbine inlet temperature significantly affects the behavior of the pre-cooler optimum volume fraction. The higher the turbine inlet temperature the less steep is the increase of the pre-cooler volume. Unlike at 750 and 850 oC turbine inlet temperature, at 550 and 650 oC the optimum volume fraction of the pre-cooler is almost constant above 20 MPa. 0.2 0.15 0.1 0.05 0 550oC 650oC 750oC 850oC 15 17.5 20 22.5 25 27.5 30 Compressor Outlet Pressure (MPa) Figure 6.32 Pre-cooler optimum volume fraction for recompression cycle The optimum heat exchanger length is significantly affected by the operating conditions as well. Therefore, it is necessary to re-optimize a design for every new set of operating conditions. The high temperature recuperator optimum length (Figure 6.33) has a similar profile as the recompressed fraction (Figure 6.29). In general the higher the turbine inlet temperature the longer is the high temperature recuperator. The high temperature recuperator optimum length at first increases until it reaches its maximum (between 1.7 and 2.7 m based on the turbine inlet temperature). It reaches a maximum somewhere between 20 and 22.5 MPa. After that the optimum length slowly decreases. For the low temperature recuperator the behavior is completely different. The optimum heat exchanger length monotonically increases over the whole investigated pressure 142 Pre-cooler Optimum Volume Fraction (-)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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