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Table 4.4: Correction factors for the cross-flow Nusselt number from the Bell-Delaware Method Correction For Correction Factor J Notes Definitions The cut of the baffles π½ =0.55+0.72πΉ Eqn.4-15 ππ πΉ =1βπππ‘π +π πππππ‘π Eqn.4-16 π π πππ‘π = 2πππ β1 π·π β 2ππ Eqn. 4-17 π·ππ‘π π·π = shell diameter ππ = dist. baffle edge to shell π·ππ‘π = tube array diam. - tube diam. Leakage around the baffles π½ =0.44 1βπ + 0.44 1βπ ππ₯πβ2.2πππ Eqn.4-18 ππ π π = π΄π,π π Eqn.4-19 Eqn. 4-20 π π΄π,π π + π΄π,π‘π π = π΄π,π π + π΄π,π‘π ππ π΄π ,ππ π΄π,π π = shell-to-baffle leakage area π΄π,π‘π = tube-to-baffle leakage area π΄π,ππ = cross flow area Bundle bypass flow 1ππππ+ β₯1/2 π π π½π = + 1/3 Eqn.4-21 ππ₯πβπΆππ 1β(2ππ π ) ππππ+ β₯1/2 π π π+ = ππ π Eqn.4-22 π π ππ,ππ π =π΄π,ππ Eqn.4-23 π π΄π ,ππ ππ π = the number of sealing strips or obstructions to bypass flow Temperature Gradient Buildup 1 πππ π π β₯ 100 π½π = 10 0.18 Eqn.4-24 ππ,ππ πππ π π β€ 20 πΆ = 1.35 πππ π π β€ 100 1.25 πππ π π > 100 Eqn. 4-25 ππ,ππ = number of tube rows in cross flow zone Baffle Spacing at inlet and outlet + (1βπ) + (1βπ) π½ =ππ β1+(πΏπ ) +(πΏπ) π ++ ππβ1+πΏπ +πΏπ Eqn.4-26 0.6 π‘π’πππ’ππππ‘ ππππ€ π = 1 Eqn. 4-27 3 πππππππ ππππ€ ππ = number of baffles + πΏπ = entrance baffle spacing + πΏπ = outlet baffle spacing 93PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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