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3-2 Dry cooler 59 For a given air mass flow, the iteration explained in the previous paragraphs gives a leaving CO2 temperature calculated with equation (3-95). This temperature should match compressor suction temperature of the thermodynamic analysis shown in Table 2-2. The second iteration procedure consists on varying the air mass flow until this requirement is fulfilled. A schematic diagram of the two iterations is shown in Figure 3-16. START FIN GEOMETRY NROWS NPASS LTUBE THERMODY- NAMIC DATA ITERATION PROCEDURE PER CONDENSER (fC IS THE UNKNOWN) INPUT FOR NEXT PASS GUESS fC Y ERROR(THL, PHL) N > TOLERANCE N ERROR(THE, PHE) > TOLERANCE Y CALCULATION THE PHE i=1 i=i+1 GUESS THL PHL ITERATION PROCEDURE PER GROUP (THL, PHL ARE THE UNKNOWNS) Y i <= NPASS N Figure 3-16: Flow diagram of the iterative procedure for dimensioning of the cooler. 3-2-5 Correlations validation The validation of the correlations for the heat transfer coefficient and the pressure drop described in Sections 3-2-1 and 3-2-2 is done comparing the design of a heat exchanger based on these correlations and the design done with the commercial code ASPEN Exchanger Design & Rating [5]. The characteristics of this heat exchanger are presented in Table 3-8. Table 3-8: Operating conditions for the validation of the steady state cooler model SOLUTION END CO2 mass flow CO2 inlet temperature CO2 outlet temperature CO2 max. pressure drop CO2 operating pressure Air mass flow Air inlet temperature Air outlet temperature Air pressure drop fH kg/s THE ◦C THL ◦C ∆PH bar ∆PHE bar fC kg/s TCE ◦C TCL ◦C ∆PH bar 119.89 95.67 31.25 0.5 50 calculated 15 50 calculated The material and geometrical characteristics of the cooler have been already introduced in Table 3-6. The operating conditions of the cycle are those of the vapor recompression Master of Science Thesis J.S. Bahamonde Noriega CALCULATION NTUBEPDF Image | Design method for s-CO2 gas turbine power plants
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