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3-1 Regenerators 45 700 600 500 400 300 200 100 Gnielinksi Ngo et al. Kim et al. Hesslegraves 50 100 150 NCV [-] 38 36 34 32 30 28 26 24 22 20 0 0.5 1 1.5 L [m] Hot stream Cold stream (a) Overall heat transfer coeffi- cient. (b) Nusselt number (Hessel- graves). 8000 7000 6000 5000 4000 3000 2000 0 0.5 1 1.5 L [m] Hot stream Cold stream 0.045 0.04 0.035 0.03 0.025 0.02 Hot stream 0.015 0 0.5 1 1.5 L [m] Cold stream (c) Reynolds number (Hessel- graves). (d) Dynamic viscosity (Hessel- graves). Figure 3-6: Calculation of the overall heat transfer coefficient, Nusselt number, Reynolds number and dynamic viscosity for the PCHE in the work of Song [4] as a function of the number of control volumes (NCV) and travel length (L). they approach the hot extreme of the heat exchanger. The viscosity, shown in Figure 3-6d, is inversely proportional to Re and therefore presents the opposite trend. The differences between the results provided by the correlations and the rating of the PHCE are presented in Table 3-4. The best prediction of the heat transfer coefficient is given by the correlations of Hesselgraves [52]. While the temperature errors are small for all the Table 3-4: Differences of the temperature, pressure and length calculations between the design correlations and the PCHE rating given by Song Hot side ∆T [%] 0.21 0.00 0.18 0.00 Cold Side Gnielinski Ngo et al. Kim et al. Hesselgraves ∆P [bar] 0.11 -0.45 0.03 -0.47 L [%] -186.56 -54.66 -102.03 -31.02 ∆T [%] 1.17 1.20 1.19 1.21 ∆P [bar] 0.07 0.15 0.17 0.10 L [%] -156.78 -38.05 -80.33 -16.94 Master of Science Thesis J.S. Bahamonde Noriega Re [-] U [W/m2K] μ [mPa·s] Nu [-]PDF Image | Design method for s-CO2 gas turbine power plants
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