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approximation is recommended, where the characteristics length for the calculation of Reynolds number is the commonly used hydraulic diameter: f =11.0Re−0.53 (3-38) All calculations used typical roughness values for heat exchanger tubes (ζ = 10-5 m). 3.3.3 Heat Exchanger Modeling Since the heat exchangers are the largest components in the cycle their careful design is an important issue. In order to reduce the total volume of heat exchangers compact heat exchangers must be used. Printed circuit heat exchangers (PCHE) are the best suited for this type of application. The reasons for selecting the PCHE are described in detail in Chapter 9 along with the detailed description of the PCHE concept and current applications. For the purpose of this chapter it is sufficient to mention that the heat exchanger consists of plates into which the channels are chemically etched. The plates are then stacked on top of each other in the hot plate / cold plate sequence and diffusion bonded into a monolithic block. The arrangement of the flow is counter-current and the channels are semi-circular in cross-section. A picture of the heat exchanger cross-section is shown in Figure 3.2. t tf Figure 3.2 PCHE cross-section For the purpose of modeling, the heat exchanger was divided into several axial nodes as shown in Figure 3.3 (40 nodes were found to be sufficient to properly capture the effect of the fluid property variations). 53PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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