A novel application for energy efficiency improvement using nanofluid in shell and tube heat exchanger equipped with helical baffles

Bahiraei, Mehdi; Hangi, Morteza; Saeedan, Mahdi

doi:10.1016/j.energy.2015.10.120

Cited by 92 publications

(16 citation statements)

References 37 publications

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“…Biyanto et al 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 and Saeedan et al, and some researchers studied about type of optimization techniques or hybrid algorithms such as Garg and Patwal et al…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…With the advent of nanofluids in heat transfer applications, many researchers analyzed SPHE both numerically and experimentally using nanofluids as working medium and found improved thermal performance . The reason for the enhancement in the thermal performance can be attributed to nanoparticles thermal conductivity and volume fractions.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17] With the advent of nanofluids in heat transfer applications, many researchers analyzed SPHE both numerically and experimentally using nanofluids as working medium and found improved thermal performance. [18][19][20][21][22][23][24][25][26][27][28] The reason for the enhancement in the thermal performance can be attributed to nanoparticles thermal conductivity and volume fractions. This implies that under constant volume fraction and flow rates, enhanced thermal performance purely depends on the conductivity of nano constituents.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement using hybrid nanofluids in spiral plate heat exchangers

Returi

Konijeti

Dasore

2019

Heat Trans. Asian Res.

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A possible way to enhance the rate of heat transfer in the spiral plate heat exchanger (SPHE) is by employing hybrid nanofluids as its working medium. Hence, in the present work, effects of hybrid nanofluids on the thermal performance of SPHE has been investigated numerically. First, a countercurrent SPHE is designed and modeled. Later, simulation of SPHE has been carried out by employing conventional fluid (H2normalOnormal), nanofluids (Al2normalO3)/normalH2O,normalCnormalunormalO/normalH2O,normalTnormaliO2/normalH2O), and hybrid nanofluids (Al2normalO3+normalCnormalunormalO/normalH2O,Anormall2normalO3+normalTnormalinormalO2/normalH2O) to investigate the heat transfer rates. Finally, the performance of SPHE using hybrid nanofluid is compared with that of using water and nanofluids. The heat transfer augmentation of approximately 16%‐27% with hybrid nanofluids of overall 4% nanoparticles volume concentration and 10%‐16% with 2% nanoparticles volume concentration is observed when compared with that of pure water. Therefore, it can be inferred that the application of hybrid nanofluids in SPHE seems to be one of the promising solutions for augmentation of its thermal performance.

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“…Regarding the fact that further mixing in the flow and, thus, more uniform profiles of temperature and velocity lead to greater heat transfer rate between the flow and the channel walls, application of these methods can be efficient to achieve higher rates of heat transfer. The researchers have utilized various techniques thus far such as different types of baffles [ 1 , 2 ], vortex generators [ 3 , 4 ], chaotic geometries [ 5 , 6 ], and so forth to create mixing in the flow and improve heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Line Dipole Magnetic Field on Hydrothermal Characteristics of a Temperature-Sensitive Magnetic Nanofluid Using Two-Phase Simulation

Bahiraei

Hangi

2016

Nanoscale Res Lett

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Hydrothermal characteristics of a temperature-sensitive magnetic nanofluid between two parallel plates are investigated in the presence of magnetic field produced by one or multiple line dipole(s) using the two-phase mixture model. As the nanofluid reaches the region where the magnetic field is applied, a rotation is developed due to the dependency of magnetization on temperature. This can lead to mixing in the flow and more uniform distribution of temperature due to the disturbance caused in the boundary layer, and consequently, enhancement in convective heat transfer. The results indicate that the disturbance in boundary layer adjacent to the lower wall is more significant than the upper wall. By application of the magnetic field, the convective heat transfer increases locally for both walls. Due to the intensified mixing, a sudden pressure drop occurs when the fluid reaches the region where the magnetic field is applied. For greater magnetic field strengths and lower Reynolds numbers, the improvement in convective heat transfer is more significant. For small magnetic field strengths, the effect of applying magnetic field on the upper wall is much smaller than that on the lower wall; however, this effect becomes almost the same for both walls at great magnetic field strengths.

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A novel application for energy efficiency improvement using nanofluid in shell and tube heat exchanger equipped with helical baffles

Cited by 92 publications

References 37 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

Heat transfer enhancement using hybrid nanofluids in spiral plate heat exchangers

Investigating the Effect of Line Dipole Magnetic Field on Hydrothermal Characteristics of a Temperature-Sensitive Magnetic Nanofluid Using Two-Phase Simulation

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