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allocated for the low temperature recuperator. For the range of total heat exchanger volumes displayed in Figure 6.15 the high temperature recuperator uses from about 10 to 5% more volume than the low temperature recuperator. 3000 2000 1000 0 80 110 140 170 12200 12000 11800 11600 11400 11200 11000 10800 10600 200 Pumping Power Mass Flow Rate Total Heat Exchanger Volume (m3) Figure 6.16 Pre-cooler pumping power and cooling water mass flow rate for different total heat exchanger volume Figure 6.16 shows that the pre-cooler pumping power decreases as the total volume of all heat exchangers increases. This indicates the importance of the pre-cooler at the lower values of the total heat exchanger volumes, where the precooler volume fraction is also higher, as was shown in Figure 6.15. The cooling water mass flow rate is on the order of 11,200 kg/s and is almost independent of total heat exchanger volume. Figure 6.17 shows that the pre-cooler outlet temperature is almost constant. This is caused by the similar properties of CO2 in the region investigated, since the pre-cooler CO2 pressure is determined by the optimum pressure ratio. Since the optimum pressure ratio is constant the CO2 properties do not change much for the different total heat exchanger volumes. The reduction of rejected heat due to the higher efficiency is matched by the small reduction of the outlet temperature. 128 Pre-cooler Pumping Power (kW) Cooling Water Mass Flow Rate (kg/s)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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