Heat exchange simulation for single HF membrane module using CFD modeling

H.-J. Shin*, C.-K. Lee, R.E.D Inc., Korea

This study was carried out to simulate the heat exchange under several temperature and flow-rate conditions in hollow fiber single module of DCMD (direct contact membrane distillation) system. The purpose of this study is to investigate the heat transfer state in various operating modes within a module. We used the CFD program for simulation. The temperature conditions are 70 ℃ and 80 ℃ for feed stream and 30 ℃ for permeate stream. Feed flow rates are 0.9 m3/h and 1.2 m3/h, permeate flow rate is 0.6 m3/h. The operation modes are in-out or out-in and co-current or counter-current to simulate heat transfer state. The actual MD module’s specifications are PVDF fiber, inner-outer diameter of 1.2 mm-0.7 mm, outer diameter of housing of 240 mm, total length of 260vmm and effective length of 240mm. It is difficult to apply fiber size of the actual model for modeling because of the limitation of the number of grids. So size of fiber had to be modify. Due to the larger diameter and thickness of modeling fiber, the thermal conductivity can vary from the actual. Therefore, it was simulated under the same operating conditions as in the laboratory test, and the material was applied as aluminum to derive the results through modeling using the mean temperature difference (δT) determined in the laboratory test. The simulation results show that...

Session: M6 - Short Oral Presentations
Day: 23 October 2019
Time: 14:45 - 16:00 h

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