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Thus, the account 223.31310 that contains the 1992 cost of the recuperators is decreased from 34,085 K$ to 25,886 K$. The account 223.31320 which contains the 1992 cost of the pre-cooler and inter-cooler is reduced from 28,439 K$ to 5,491 K$ for the stainless steel pre-cooler or to 12,671 K$ for the titanium pre-cooler. 8.5 Cost of Turbomachinery The estimation of the turbomachinery cost is more difficult than that of the heat exchangers because CO2 turbines are not currently manufactured. Therefore, the helium turboset costs from the GCRA report were scaled using cost functions published for the HTR direct cycle [Schlenker, 1974]. This paper suggests that the cost of the turbomachinery can be scaled from the known cost to the new cost if the new power, operating pressure and temperature are known. The relations were developed for units containing two compressors and one turbine. Both the supercritical CO2 turboset and the GCRA helium turboset have two compressors and one turbine. The paper gives the following formulas: ⎛T ⎞7.8 Cn =3.35+⎜ Tin ⎟ ⎝1000⎠ C = p−0.3 n Tin (8-2) (8-3) (8-4) where Cn is the cost proportionality constant, TTin is the turbine inlet temperature in oC and pTin is the turbine inlet pressure (bar) and NG is the power in MWe. The range of applicability is for temperature scaling from 850 to 1150 oC, for pressure scaling from 50 to 120 bars and for power scaling from 500 to 2000MWe. The cited paper gives pressure dependence formulas only for a turboset rated at 1000 MWe. Luckily, it provides a chart for costs ranging from 500 MWe to 2000 MWe with a 250 MWe step. From this chart it was possible to develop a function for the exponent used in the scaling formula. The exponent in Eq. 8-3 was calculated based on this function. The reference operating conditions of the helium turbine from GCRA are inlet temperature of 850oC, inlet Tin C =N1.7 nG p285 +0.6 190PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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