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62 Components design 12 11 10 9 8 7 6 2 4 6 8 10 LTUBE [m] NROW NROW NROW NROW =4,NPASS =1 =4,NPASS =2 =4,NPASS =4 =6,NPASS =1 NROW NROW NROW NROW NROW =6,NPASS =2 =6,NPASS =6 =8,NPASS =1 =8,NPASS =2 =8,NPASS =4 20 15 10 5 0 2 4 6 8 10 LTUBE [m] NROW =4,NPASS =1 NROW =4,NPASS =2 NROW =4,NPASS =4 NROW =6,NPASS =1 NROW =6,NPASS =2 NROW =6,NPASS =6 NROW =8,NPASS =1 NROW =8,NPASS =2 NROW =8,NPASS =4 (a) Fan power. (b) Weight. Figure 3-18: Fan power and bundle weight of the solutions for the cooler geometry as a func- tion of the tube length, number of passes and rows. The design optimization is performed for the recompression Brayton system described in Figure 2-21. the constraints in Table 3-10 which exclude the solutions with pinch temperatures lower than 5◦C, for example. The analysis in this work takes the cooler configuration with the lowest power consumption as the optimal. The information about this heat exchanger chosen from the solutions in Figure 2-21 is presented in Figure 3-19. 120 100 80 60 40 20 0123 LTUBE [m] CO2 stream Air stream Characteristic Number or tubes Number or columns Number or rows Number of passes Tube length Pinch Fan power Weight Pressure drop Value — 10040 — 2510 — 4 — 4 m 3 ◦C 8.42 kW 114.23 tonne 11.83 bar 0.30 Figure 3-19: Characteristics of the cooler optimal geometry and its correspondent temperature profile for the recompression Brayton system described in Figure 2-21. Notice how the slope of the CO2 temperature is larger when the stream is far from the critical point. Once the CO2 approaches the critical temperature, the slope decreases until the last pipe, in which the temperature of the CO2 remains almost constant due to the increment in the specific heat capacity. The pinch temperature is 8.42◦C, which is slightly higher than the imposed limit of 5◦C. Therefore, the geometry of the cooler can be further modified in next projects until the minimum temperature approach is reached. The pressure drop from the thermodynamic analysis is 0.26 bar, and the design presents a value of 0.30 bar, which is reasonably close and proves the validity of the procedure to calculate the number of tubes related with equation (3-92). J.S. Bahamonde Noriega Master of Science Thesis T [◦C] MCO [tonne] W ̇ F N [ M W ]PDF Image | Design method for s-CO2 gas turbine power plants
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