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CO2 mass flow rate within the cycle increases (Figure 4.17) because as the total heat exchanger volume increases the recuperator effectiveness increases and thus the heat addition to the cycle (in kJ/kg) is reduced. Since the thermal power is fixed, the only way in which the reduction of the heat addition can be matched is by increasing the CO2 mass flow rate. The improvement of the recuperator effectiveness together with the mass flow rate increase causes the cooling water temperature to drop. The waviness of the curve at higher total heat exchanger volumes is again caused by the discrete pressure ratio step change. As more heat exchanger volume is provided the pumping power of the pre-cooler is reduced even though the cooling water mass flow rate requirements increase (Figure 4.18). This is caused by the reduction of the cooling water outlet temperature (Figure 4.17), which has a stronger effect than the reduction of the heat rejection from the system due to the efficiency improvement. 2800 40 Mass flow rate Temperature 2750 2700 2650 39.5 39 38.5 38 2600 37.5 2550 2500 2450 37 36.5 36 35.5 2400 35 0 10 20 30 40 50 60 70 80 90100110120 Total Heat Exchanger Volume (m3) Figure 4.17 CO2 mass flow rate and cooling water outlet temperature 90 CO2 Mass Flow Rate (kg/s) Cooling Water Outlet Temperature (oC)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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