Abstract
In this study, the thermal and hydraulic performance of three different shell and tube heat exchanger configurations including finless tube mode (HXFL), finned tube mode (HXFT), and optimized finned tube mode (OHXFT) has been investigated. A part of the distance between two consecutive heat exchanger baffles was simulated in three dimensions, then using the simulation results and a numerical algorithm, the results were calculated for the entire heat exchanger. The results show that the use of finned tubes instead of ordinary tubes in the heat exchanger prevents the passage of flow over the tubes and reduces the efficiency of the heat exchanger. Also, in heat exchangers with finned tubes, the amount of pressure drop is more than in the other two configurations. To increase the efficiency of the heat exchanger, the OHXFT configuration was presented, in which a protrusion was placed on the inner wall of the shell. This protrusion led to the passage of all flow over the finned tubes. The results show that this configuration has an amount of pressure drop around the HXFL configuration and the highest thermal efficiency compared to the other two configurations.
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