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3-2 Dry cooler 49 systems in this study have a compressor suction temperature of 31.25◦C, which allows the use of dry coolers with air as the heat sink. This is important since s-CO2 power plants can be placed in locations without water resources and besides dry coolers avoid water pollution, which makes this type of heat exchangers an attractive option for the cooler. The geometry of the dry cooler selected for the present study corresponds to plain flat fins on a tube array. Such configuration is used mainly in refrigeration and whenever an air low pressure drop is required [54]. While staggered tube arrays are common, inline tube arrangements are barely used and required only where the air pressure drop is constrained to be extremely low. It is beneficial to reduce this pressure drop since it will decrease the fan power consumption. Thus, an inline tube arrangement could seem a good choice. However, the heat transfer coefficient of the inline arrangements may be as small as 60% of the staggered array value [64]. This would increase considerably the size of the condenser, which is preferable to avoid. A staggered tube arrangement with plain flat fins combines the benefits of a low air side pressure drop with a reasonable heat transfer coefficient. A schematic graph of such configuration is shown in Figure 3-12. Figure 3-12: Cooler schematic diagram. Tube bundle front and side views. 3-2-1 Overall heat transfer coefficient The overall heat transfer coefficient is a function of the resistances given by the tube side fluid, the tube wall, the fins and the air side, U = α + 2λ H −1 ATUBE , 1 DI DO DO DO,FIN 1 AI ηFIN+ AI ln D + 2λ ln D + AFIN TUBE I FIN O αC (3-42) where αC and αH correspond to the air and tube side heat transfer coefficients, λFIN and λTUBE stand for the thermal conductivities of the fins and tubes, and DO and DI are the external and internal tube diameters respectively. The external fin diameter, DO,FIN, is a Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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