Optimisation of Double Pipe Helical Tube Heat Exchanger and its Comparison with Straight Double Tube Heat Exchanger

Kareem, Rashid

doi:10.1007/s40032-016-0261-x

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…Based on existing reports, it has been shown before that HTHE outperforms traditional straight-type tube heat exchangers [ 12 ]. Kurnia et al [ 13 ] assessed the efficiency of boosting heat transmission and entropy production for low Reynolds numbers through coiled pipes of various sectional forms compared to plain tubes with identical segments.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Fahad,

Hasan,

Ifraj

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Fahad,

Hasan,

Ifraj

et al. 2024

Heliyon

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“…The results reported that the smallest pitch ratio and diameter ratios exhibit the highest heat transfer rate. Kareem [16] conducted a numerical study to compare four shapes of double helical coil (circular, triangle, square, and rectangle). It was found that the rectangular shape has the best heat transfer properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Najm

Jumaah

Karim

2022

DJES

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The goal of this work was to design a simple and cost-effective technique for improving the performance of heat exchangers, and the emphasis was on the experimental side while not neglecting the necessity of validating our findings with theoretical results using CFD. A new method was used to enhance the heat transfer inside the heat exchanger by using a coil with modified steps, as the published papers did not previously address this method, which proved its effectiveness. For varied coil pitches, the numerical findings were in good agreement with the experimentally obtained results, with an error rate of less than 8%. To compare results and confirm effective correlation between pitch changes, a double coil tube is manufactured with a fixed pitch and a double coil tube with modified pitches, while maintaining the basic design parameters of tube diameter ( ), shell diameter ( ), height of shell ( ), and coil height ( ) in order to try to increase the overall heat transfer coefficient and heat transfer. This new design enhanced heat transfer and total heat transfer coefficient at Reynolds number (400< <2000), with a 22% improvement in overall heat transfer coefficient. The new design of the coil (modified pitch) also gave an improvement in the flow distribution, which generated a higher secondary flow than the traditional pitch coil.

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“…They have used solid works flow simulation software by the computation fluid dynamic method and concluded the ribbed tube heat exchanger has good performance evaluation criteria. Kareem [3] done comparative numerical studies using ANSYS FLUENT with optimization of double pipe helical coiled tube exchanger with straight tube of equivalent cross-sectional area and length as that of unwounded length of double pipe helical coil. Abeykoon [4] predicted the theoretical and practical CFD results and showed a slight 1.05% difference in cooling performance of hot fluid for designing and optimization of heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Conventional and Helical Finned Shell and Tube Heat Exchanger Using ANSYS-CFD

Pasupuleti¹,

Bedhapudi²,

Reddy³

et al. 2021

IJHT

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The summary of the proposed work is to compare the rate of heat transfer, logarithmic mean temperature difference (LMTD) and effectiveness (ε) for a conventional shell and tube heat exchanger with and without helical finned surfaces on tube side of heat exchanger. It is shown that the inlet velocity of cold fluid at the tube side varies, while the inlet velocity of hot fluid at the shell side remains constant. The percentage variations of heat transfer rates with theoretical and simulation methods are compared. The geometry is modelled in ANSYS design modeler and analysis have been carried out in ANSYS-CFD. The inlet velocity of shell side hot fluid is varied in both types of heat exchangers. The proposed work is tested for two configurations of counter flow heat exchanger (conventional and helical finned surfaces) under different shell side inlet velocities of fluids. Helical finned tube heat exchanger with counter flow has a higher LMTD than a conventional counter flow heat exchanger. Variation in heat transfer rates and heat transfer coefficients were observed in heat exchanger influenced by shell side hot fluid velocity. The study shows that helical finned tube surfaces have improved heat transfer rates, LMTD, effectiveness (ε) and overall heat transfer coefficients compared to the conventional heat exchangers.

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Optimisation of Double Pipe Helical Tube Heat Exchanger and its Comparison with Straight Double Tube Heat Exchanger

Cited by 12 publications

References 14 publications

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Computational Analysis of Conventional and Helical Finned Shell and Tube Heat Exchanger Using ANSYS-CFD

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