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Account 26 – Heat Rejection System - is mainly affected by the increased efficiency of the power cycle and thus reduced heat rejection requirements. There are two competing effects: the large reduction of account 263 (Circulating and Service Water System) and the increase in account 262 (ECA Cooling Water System), which provides the isolation cooling loop between the Circulating and Water Service System and the pre- cooler and inter-cooler, located in the primary system. The reason for deployment of this isolation cooling loop was to improve the chemistry control and reduce the maintenance for these primary system heat exchangers. Accounts 9 - Indirect Costs - reflect the reduction of cost of services due to the reduction of the direct costs. 8.4 Cost of Heat Exchangers To assess the cost of the supercritical CO2 plant it is important first to evaluate the costs of the main cycle components. The cost of heat exchangers can be estimated based on the weight of the heat exchanger. As described in Chapter 3 the HEATRIC printed circuit heat exchangers are used for the current design. For a large order, i.e. at least one supercritical CO2 cycle unit at 300 MWe, HEATRIC quoted the cost of 30 $/kg for stainless steel units and 120 $/kg for titanium units [Dewson and Grady, 2003]. Currently, the HEATRIC company is actually selling its heat exchangers to STATOIL on a £/kg basis. HEATRIC supplies the heat exchanger and upon delivery to STATOIL it is weighed and then paid for, so this is an established practice. To assess the cost it is necessary to evaluate the weight of the unit. Since a common reference geometry for the heat exchanger is used for the recuperators and pre-cooler it is quite simple to establish the fraction of metal per m3 of the heat exchanger and then based on the total weight of the heat exchanger calculate its cost. The fraction of metal, fm, per m3 of heat exchanger can be calculated from: πd2 fm =1− 8Pt (8-1) 188PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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