Chen, GuidongZeng, MinWang, Qiuwang2014-06-132014-06-132008Chen, G, Zeng, M & Wang Q, 2008, 'Numerical studies of combined multiple shell-pass shell-and-tube heat exchangers with helical baffles', Paper presented to the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July 2008.9781868546916http://hdl.handle.net/2263/40166Paper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.In order to simplify the manufacture and improve the heat transfer performance, we have invented a combined multiple shell-pass shell-and-tube heat exchanger. The novel combined multiple shell-pass shell-and-tube heat exchanger (CM-STHXs) with continuous helical baffles in the outer shell-pass and other different baffles in the inner shell-pass was compared with conventional STHX with segmental baffles by Computational Fluid Dynamics method. The numerical results show that, under the same mass flow rate M and the same overall heat transfer rate Qm in the shell side, the CM-STHX with discontinuous helical baffles in the inner shell-pass has the lowest overall pressure drop DP, which was 13% lower than that of the segmental baffled STHX; The heat transfer rate Qm of the CM-STHX with discontinuous helical baffles in the inner shell-pass is about 2% and 12% higher than those of the CM-STHX with segmental baffles and disk-and-doughnut baffles in the inner shell-pass. The CM-STHX with discontinuous helical baffles in the inner shell-pass has a much better heat transfer performance and can be used to replace the conventional STHX with segmental baffles in industrial applications to save energy, reduce cost and prolong the service life.8 pagesPDFenUniversity of PretoriaHelical bafflesNumerical studiesHeat transfer performanceComputational fluid dynamics methodHeat transfer rateContinuous helical baffleDisk and doughnut baffleDiscontinuous helical baffleCombined multiple shell pass heat exchangersCM-STHXsMutiple shell-pass shell-and-tube heat exchangersShell-pass heat exchangersShell-and-tube heat exchangersPresentation