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54 Components design where C stands for the mechanical, corrosion and erosions allowances. This value is set to 0 in this study. The corrosion rates of carbon steel with s-CO2 are up to 10 times higher than the rates for austenitic stainless steel [68] and therefore the latter is chosen as the tubing material. The allowable stress for stainless steel is 1379 bar at 100◦C. The quality factor K is taken as 0.85, which is correspondent to an electric fusion welded pipe. It is possible to calculate the wall thickness as a function of the internal pressure and the tube outside diameter, as shown in Figure 3-13. 30 25 20 15 10 200 300 400 500 600 PI [bar] Figure 3-13: Cooler pipe minimum thickness as a function of the internal pressure and the pipe outside diameter [mm]. It is necessary to fix the geometry of the cooler to perform the dimensioning calculations. This geometry is chosen with the intention of fulfilling the recommendations indicated in Table 3-5, which regard the usage of the correlations for the pressure drop and the heat transfer coefficient. The dimensions are chosen as small as possible since this is beneficial for the overall heat transfer coefficient [8]. The result of these considerations is presented in Table 3-6. Table 3-6: Cooler geometrical parameters and materials selected for the design procedure of the dry cooler Geometrical parameters Tube external diameter Pipe wall thickness Tube horizontal pitch Tube vertical pitch Fin pitch Fin thickness Materials Tube material Fin material DO m δTUBE m SCOL m SROW m SFIN m δFIN m 0.012 0.001 0.030 0.015 0.002 0.0002 There are gaps between the ranges recommended by Ferreira and Wang presented in Table 3-5. For example, the minimum pipe outer diameter used by Ferreira is 13.5 mm, while the maximum diameter used by Wang is 12.7. Consequently, there are geometrical dimensions in Table 3-6 that do not comply with one of the mentioned ranges. This should be considered J.S. Bahamonde Noriega Master of Science Thesis Stainless steel SS316 Aluminium 1060 4 7 5 6 3 2 DO [m] 4 5 3 4 2 3 1 2PDF Image | Design method for s-CO2 gas turbine power plants
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