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exchanger type. After scoping several possible heat exchanger designs it was decided to use printed circuit heat exchangers. The details of the selection process and the description of these heat exchangers are given in Chapter 9. 3.3.1 Heat Transfer Model There are at most three different types of heat exchangers in any gas cycle: the recuperator, which operates with the working fluid, CO2 in our case, on both sides; the pre-cooler that cools the working fluid with a stream of cooling water; and the intermediate heat exchanger, which transfers the heat from the primary coolant to the power cycle working fluid. Therefore, it is necessary to develop a heat transfer model for supercritical CO2, water and primary coolant. In this work PbBi and helium are used as a primary coolant. For helium the same heat transfer model as for CO2 can be used. For PbBi an additional model must be implemented. The information on heat transfer modeling in PCHE in the literature is limited. The PCHE channels are semicircular channels that can be either straight or wavy. Unless otherwise specified in the text straight channels were used in this work, because of better understanding of this geometry and lack of reliable heat transfer and pressure drop correlations for the wavy channels. Thus the obtained results are conservative, as wavy channels improve the heat transfer performance significantly. Hesselegraves [Hesselegraves, 2001] recommends using the Gnielinski correlation for the straight semi- circular channels for the turbulent flow regime (Re > 2300) fc (Re−1000)Pr Nu= 8 1+12.7⎜Pr3 −1⎟ c ⎛⎜2 ⎞⎟f (3-14) ⎝⎠8 where Nu is the Nusselt number, Re is the Reynolds number, Pr is the Prandtl number and fc is the Moody friction factor defined as: 46PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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