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3-2 Dry cooler 55 when applying this procedure in future works. The properties of the materials used in this study are presented in Table 3-7. Table 3-7: Cooler material properties SS 316 (tubes) Material Density Thermal conductivity Roughness 3-2-4 Calculation procedure kg/m3 7990.00 [55] W/m2K 16.20 [55] mm 0.045 [70] Al 1060 (fins) 2698.79 [69] 234.37 [69] — The calculation of the dimensions of the cooler is performed by means of the discretization of the pipes in the bundle. A schematic diagram of this procedure is shown in Figure 3- 14. While this particular case has 8 rows with 4 passes, further analysis consider additional (a) Cooler discretization. (b) Single control volume. Figure 3-14: Discretization of the pipes and single control volume in the dry cooler. layout configurations. The thermodynamic states of both cold (air) and hot (CO2) sides can be gathered as a matrix, as shown in Figure 3-14a. The free body diagram of a single element with two nodes is shown in Figure 3-14b. The information regarding the leaving CO2 properties in the cooler are known from the thermodynamic analysis. The inlet air properties correspond to environmental conditions, which are taken as 15◦C and 1 bar in this study. It is possible therefore to obtain the overall heat transfer coefficient with the correlations described previously and additionally it is possible to establish the energy balance for the first element, which has the index (1,1) in Figure 3-14. There are several assumptions considered in this analysis, • the CO2 mass flow rate is distributed equally in all the tubes, • the properties at the beginning of the element are representative for the entire section, • heat transfer in the direction of the flow is neglected, • the air properties are considered constant and equal to those under environmental con- ditions. Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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