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where d is the semicircular channel diameter, P is the channel pitch and t is the thickness of the heat exchanger plate. For the reference heat exchanger design with channel diameter 2mm, channel pitch 2.4mm and plate thickness 1.5mm the metal fraction is fm is 0.564, i.e. 56.4 % of the total heat exchanger volume is metal. From the heat exchanger design the required core volumes of heat exchangers are known. The heat exchanger core weight thus can be obtained simply by multiplying the fraction of metal fm and the heat exchanger core volume by the metal density. As described in Chapter 9 on component description the additional mass of the headers is negligibly small and was therefore neglected. Table 8.4 and Table 8.5 summarizes the costs of the heat exchangers required for the supercritical CO2 cycles. The reference cycle design analysis estimated the net efficiency to be 42%. Therefore, for 4 x 450 MWth the electric output is 756 MWe. The costs in Table 8.4 and Table 8.5 were derived not for the reference case of 600 MWth for which the reference case has been developed, but for the electric power that corresponds to the GCRA specification, the reason being an effort to preserve the correct cost proportion. The density used for stainless steel is 7800 kg/m3, and for titanium 4500 kg/m3. The inflation add-on between January 1992 and December 2003 is 33.96% (http://inflationdata.com/Inflation/Inflation_Rate/InflationCalculator.asp). Table 8.4 Summary of heat exchanger costs (Stainless steel case) HT Recuperator LT Recuperator Pre-cooler Material SS steel SS steel SS steel Volume m3 158.85 138.15 63.00 Weight kg 698,812.92 607,749.48 277,149.60 Cost Cost 2003 K$ 1992 K$ 20,964.39 13,844.88 18,232.48 12,040.73 8,314.49 5,490.89 Table 8.5 Summary of heat exchanger costs (Stainless steel + Titanium) case Material HT Recuperator SS steel LT Recuperator SS steel Pre-cooler Titanium 63.00 159,894.00 Volume m3 Weight kg 698,812.92 607,749.48 Cost Cost 2003$ 1992 K$ 20,964.39 13844.88 18,232.48 12040.73 19,187.28 12671.28 158.85 138.15 189PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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