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3-2 Dry cooler 51 By definition the Reynolds number reads Re = GDHD . (3-53) μ The mass flux for the air side is function of the geometry and the air mass flow, G= f . (3-54) The second procedure to calculate the Nu is given by Wang and Chi [8] and recommended by Sha [54]. It deals with the calculation of the Colburn factor j, j= where DHD −0.29 S C1 S FIN DCL C5 −1.084 S FIN −0.786 S FIN SCOL C2 for NROW = 1, 0.108Re 0.086ReC N C6 −0.93 FIN (3-55) (3-56) (3-57) (3-58) (3-59) (3-60) (3-61) (3-62) (3-63) COL CL SROW ′ 3 S S′ DHD S SCOL forN ROW 0.41 , ≥2, FIN CL ROW DCL FIN (SCOL − DO)(SFIN − δFIN)NCOL LFIN SFIN C1 = 1.9 − 0.23ln (ReCL) , C2 = −0.236 + 0.126ln (ReCL) , 0.042N ln (ReCL) C = −0.361 − 3 C4 = −1.224 − C5 = −0.083 + 0.058NROW , ReCL C6 = −5.735 + 1.21ln N ROW ROW DCL S ROW + 0.158ln N FIN 0.076 S DHD 1.42 ln (ReCL) ln (ReCL) , . ROW ′ The Reynolds number ReCL is based on the collar diameter DCL = DO + 2δFIN, ReCL = ρvMINDCL , μ where ρ corresponds to the density of the air and the velocity vMIN is that correspondent to the minimum free flow area, AMIN. In staggered arrays, the minimum free flow area can be located either at the plane perpendicular to the air mass flow (with dimension 2a in Figure 3-12), or at the plane aligned with the tube pitch (with dimension b in Figure 3-12). In order to calculate this area, Sha [54] calculates the variables a and b for each case, Master of Science Thesis J.S. Bahamonde Noriega 2a = (SCOL − DO) − (SCOL − DO) δFIN , SFIN b = (STUBE − DO) − (SCOL − DO) δFIN , SFIN (3-64) (3-65)PDF Image | Design method for s-CO2 gas turbine power plants
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