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capture the trend. It turns out that close to the critical point the CO2 heat transfer coefficient is comparable to that of water. Due to the comparable densities of water and CO2 the use of the same hydraulic radius on both (hot and cold) sides is possible, without forcing one of the fluids to operate with high pressure drop or low heat transfer. In addition to the large variation of heat transfer coefficient the temperature difference varies in a similar manner as in the case of the low temperature recuperator. The minimum temperature difference appears somewhere along the precooler. Consequently, it is again necessary to use several nodes to correctly evaluate the precooler performance. 10 8 6 4 2 0 30 35 40 45 50 55 60 65 70 Temperature (oC) Figure 9.1 Heat transfer coefficient of CO2 close to the critical point from Gnielinski correlation 9.2.1 Description of the HEATRIC PCHEs Two different compact heat exchanger types were investigated. The first choice, plate and fin compact heat exchangers performed well and their size was reasonable. However, when the high-pressure differential was taken into account and a basic structural analysis was performed, the required material thickness (mainly that of the 203 Normalized Heat Transfer CoefficientPDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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