Presentation on theme: "Derek Bleyle Ahmed Cengiz E.J. Koors Josh Lukins Mike Lutkewitte."— Presentation transcript:
Derek Bleyle Ahmed Cengiz E.J. Koors Josh Lukins Mike Lutkewitte
Problem definition Cool chemical from 45° to 25° Length < 7 m Diameter < 2 m Minimize cost Minimize pressure drop
Variable explanations I_shell_fluid/ I_tube_fluid “This is the fluid defined in the problem definition.” mdot_shell “This is the flow rate defined in the problem definition.” T_shell_in “This temperature is defined in the problem definition.” T_shell_out “This is a variable that is being solve for.” T_tube in/ T_tube out “This temperature is defined in the problem definition.”
Variable explanations T_shell_out “ This is a variable that is being solve for.” T_tube in/ T_tube out “ This temperature is defined in the problem definition.” Rf_tube_in/ Rf_tube_shellside “ This is a typical rate of fouling according to Professor Toksoy.” I_shell_tube_side_fluids_reversed/ I_counter_flow “ To make this a reverse flow heat exchanger would increase the pressure drop on the shell side, and one of the objectives is to minimize the pressure drop. This means that we chose to make this a parallel flow HE to minimize the pressure drop created.”
Variable explanations N_tube_pass / N_shell_pass “ To increase the number of passes requires the flow to be turned 180 degrees in some fashion. This increases the pressure drop in the heat exchanger. We chose to keep it a one pass HE to minimized that pressure drop.” I_Baffle / Baffle_Space / Baffle_Cut “ Baffles were excluded from this project because including baffles increases the pressure drop, and one of the goals is to minimize the pressure drop.” Shell_th “ Shell thickness has no effect on the heat exchange capabilities, so this shell just needs to be able to withstand the pressure that the fluid is under. Because of this we chose a 1 mm thickness shell.”
Variable explanations I_shell_mat “ Shell material also has no effect on the heat exchange capabilities and very little effect on the shell pressure drop since the shell will have a very large surface area to volume ratio. Therefore we were able to chose a material with the appropriate strength at the desired thickness to withstand the pressure and not be corroded.” I_Nusselt_shell / I_Nusselt_tube “ Since this is the rate of convective heat transfer to the rate of conductive heat transfer and the tubes are considered to have 0 resistance to heat transfer in this problem, this number can be assumed to be the same for all different designs” Center_Tube_OD / Tube_th “ This parameter is linked directly to the outside diameter which is part of the DOE.”
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