Effects of geometrical parameters on hydrothermal characteristics of shell-and-tube heat exchanger with helical baffles: Numerical investigation, modeling and optimization

Saeedan, Mahdi; Bahiraei, Mehdi

doi:10.1016/j.cherd.2015.02.004

Cited by 39 publications

(7 citation statements)

References 24 publications

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“…Biyanto et al 17 studied HEN retrofit, which was applied to maximize heat recovery without changing the area of heat transfer or adding new HE and the arrangement of HE in HEN. The literature survey shows that some studies have been conducted on a single shell and tube HE such as Bahiraei [18][19][20] and Saeedan et al, 21 and some researchers studied about type of optimization techniques or hybrid algorithms such as Garg [22][23][24][25][26] and Patwal et al 27 2 | MATHEMATICAL METHOD Hall 3 suggested a simple equation to estimate the heat exchange capital costs as follows:…”

Section: Total and Partial Decomposition Methodsmentioning

confidence: 99%

Applying multiple decomposition methods and optimization techniques for achieving optimal cost in mixed materials heat exchanger networks

Karimi

Ahmadi‐Danesh‐Ashtiani

Aghanajafi

2019

Int J Energy Res

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Summary The optimization of the total annual cost in heat exchanger networks has been one of the overarching goals when synthesizing these networks. Several methodologies and techniques have been developed to achieve optimal costs in mixed material heat exchanger networks. This paper demonstrates the application of two decomposition methodologies (total decomposition and partial decomposition) for typical cost rules. The objective function was defined as the optimization and minimization of the total annual cost in mixed materials heat exchanger network. Three optimization algorithms, hybrid genetic‐particle swarm optimization (GA‐PSO), shuffled frog leaping algorithm (SFLA) techniques, and ant colony optimization (ACO), were used to further optimize the total cost in mixed materials heat exchanger network. The results indicate that the total annual cost in partial decomposition method was smaller than that in full integration method and total decomposition method. The reduction of the total annual cost was about 27% for GA‐PSO algorithm, 24% for SFLA and 10% for ACO relative to the results reported in this work. In partial decomposition method, at least one mixed material of heat exchanger was used to reduce the hot and cold utility for decreasing the total annual cost. Partial decomposition method resulted in the highest reduction of the total annual cost compared with other methods. Percentage of difference of the total annual cost were 0.36%, 1.92%, and 5.05% for full integration, total decomposition, and partial decomposition methods, respectively, in comparison with the previous studies. Results have been compared with the results of other studies to demonstrate the accuracy of the applied algorithms.

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Section: Total and Partial Decomposition Methodsmentioning

confidence: 99%

Applying multiple decomposition methods and optimization techniques for achieving optimal cost in mixed materials heat exchanger networks

Karimi

Ahmadi‐Danesh‐Ashtiani

Aghanajafi

2019

Int J Energy Res

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“…where: Dotl is the tube bundle-circumscribed circle; Ltp denotes the tube layout pitch and Ltp,eff is the tube pitch perpendicular to flow direction. The term B represents the helical pitch (cycle amplitude) which depends on: the baffle helix angle φ, the baffle overlaps proportion e, the number of baffles per cycle Nb and the shell inside diameter Ds, as defined in below [9,18,19]:…”

Section: Total Shell-side Pressure Dropsmentioning

confidence: 99%

Helical Baffle Thermohydraulic Performance Versus Segmental Baffle One

Yousfi

2022

mech

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In this contribution, we reworked the Bell-Delaware technique for a HB-STHX to systematically study its thermohydraulic performance behavior in the shell side. The helical baffles are continuous quadrant sectors with five inclination angles 25°, 30°, 35°, 40° and 45° and are exanimated for six different values of Reynolds number from up to 40 . We have observed an increase in global heat transfer rate while a decrease in pressure loss, in continuous helical baffle case compared to segmental one. we have found that the baffle inclination 40° has the largest heat transfer coefficient, 25° gives the lowest pressure drop, whereas 45°, the largest inclination we have used, displays the greatest performance evaluation factor.

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“…Furthermore, an innovative shell-and-tube HE with screw cinquefoil orifice baffles has been presented by Zhang et al [30] to obviate defects of conventional shell-and-tube HEs with these baffles. Saeedan and Bahiraei [31] presented 3D simulations of shell side of shelland-tube HE with helical baffles for various values of helix angle and overlapping. Ma et al [32] simulated the thermal performance and fluid flow properties of HE's shell sides with trefoilhole and quadrifoil-hole baffles.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Fields inside S-Shaped Baffled-Channel Air-Heat Exchangers

Menni

Lorenzini

Kumar

et al. 2021

Mathematical Problems in Engineering

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A numerical study of an especial heat exchanger (HE) equipped with complicated geometry baffles was performed in this research study. This shell-and-tube HE could be applied in various engineering applications like solar collectors. It can be acknowledged that generating longitudinal vortices in the flow results in enhancing the turbulent convective heat transfer. In order to generate these vortices, S-shaped baffles can be applied. It should be noted that computational analysis of shell-and-tube HEs is considered a challenging task due to these vortices. So, in this study, a commercial CFD software has been used for solving the problem and important equation and numerical approach used in the simulation have been explained. The aerodynamic aspect with respect to stream function, mean, axial, and transverse velocities, dynamic pressure, turbulent dissipation rate, turbulence kinetic energy, turbulent viscosity, and turbulence intensity fields was included in this research. This study reports many physical phenomena, such as the turbulence, instability, flow separation, and the appearance of reverse secondary currents. The average speed changed in different areas, where it is low next to the baffles. Velocity amounts are paramount around the upper channel’s wall, starting from the upper left side of the last baffle to the exit. This increase in velocity can be justified by a reduction in flow area and pressure augmentation.

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Effects of geometrical parameters on hydrothermal characteristics of shell-and-tube heat exchanger with helical baffles: Numerical investigation, modeling and optimization

Cited by 39 publications

References 24 publications

Applying multiple decomposition methods and optimization techniques for achieving optimal cost in mixed materials heat exchanger networks

Applying multiple decomposition methods and optimization techniques for achieving optimal cost in mixed materials heat exchanger networks

Helical Baffle Thermohydraulic Performance Versus Segmental Baffle One

Aerodynamic Fields inside S-Shaped Baffled-Channel Air-Heat Exchangers

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