Influence of Tube Arrangement on the Thermal Hydraulic Performance of a Membrane Helical-Coil Heat Exchanger

Zhao, Zhenxing; Che, Defu

doi:10.1080/10407782.2012.707061

Cited by 11 publications

(4 citation statements)

References 38 publications

(53 reference statements)

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“…Different parameters including the flow velocity, pressure, and various pitch lengths were tested. Zhao and Che 20 numerically measured the effects of the Reynolds number, dimensionless pitch, and different configurations of the tube on the hydraulic and thermal aspects of a helical coil HX with membranes. It was shown that the in‐line tube arrangement presents a better thermal performance compared to the staggered pattern, although it exhibits higher pressure drops.…”

Section: Introductionmentioning

confidence: 99%

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Afsharpanah

Pakzad

Ajarostaghi

et al. 2022

Intl J of Energy Research

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Summary Frequent power outage in developing countries has created many problems for the people living in these regions, one of the most important of which is food spoilage due to the rise of refrigerator temperature. Ice storage systems are one of the promising techniques for handling this difficulty. Computational simulations are done here to influence the effects of dimensionless parameters on the charging rate of a shell and dual coil ice storage unit equipped with connecting plates as heat transfer enhancers. The ice storage unit is intended to be used as a backup cooling source for refrigerators in these regions. The studied parameters include the helical pitch length/storage height ratio (α1), the helical coil distance/storage diameter ratio (α2), the helical coil diameter/storage diameter ratio (α3), the connecting plate length/storage height ratio (α4), the connecting plate thickness/tube diameter ratio (α5), the modified Stefan number of the refrigerant flow (Ste*), and refrigerant flow Reynolds number (Re). The results suggest that the geometrical optimization of the proposed ice storage with α1, α2, and α3 parameters can improve the charging process up to 16.69%, 7.25%, and 18.84%, respectively. Also, the presence of full‐length connecting plates can enhance the charging rate by up to 12%. While the influence of the Ste* on the charging rate is considerably high (25.56%), the Re does not exhibit a noticeable effect (0.95%). Moreover, the influence of natural convection on the process was considered, however, it was found that it does not have a considerable effect on the ice formation.

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Section: Introductionmentioning

confidence: 99%

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Afsharpanah

Pakzad

Ajarostaghi

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…Correlations were obtained for Nu and f using the genetic algorithm. Zhao et al 25 studied thermal hydraulic performances of membrane helical coil heat exchangers in in-line and staggered arrangements, and are numerically investigated. The influences of Reynolds number, dimensionless pitch, and arrangement on heat transfer and flow are discussed.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

et al. 2020

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Heat exchangers are extensively used in various industries. In this study, the impact of geometric and flow parameters on the performance of a shell and double helical coil heat exchanger is studied numerically. The investigated geometric parameters include external coil pitch, internal coil pitch, internal coil diameter, and coil diameter. The influences of considered geometrical parameters are analyzed on the output temperature of the hot and cold fluid, convective heat transfer coefficient, pressure drop, and average Nusselt number. Water is considered as working fluid in both shell and tube. As an innovation, double helical coils are used instead of one in the heat exchanger. To compare the obtained results accurately, in each section, the heat transfer area (coil outer surface) is kept constant in all models. The results show that the geometrical parameters of double helical coils significantly affect the heat transfer rate.

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“…It was shown that the overall performance of the heat exchanger with the membrane helical coil was better compared with the heat exchanger with serpentine tubes. In another numerical study conducted by Zhao and Che [43], the effects of different tube arrangements on hydraulic and thermal aspects of the performance of a helical membrane heat exchanger were studied. They examined how Reynolds number, pitch ratio, and The results indicated that the helical coil heat exchanger has a substantial effect on heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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Nowadays electrical power is one of the most vital requirements for daily life and industries. Since with the rise of the human population, providing electrical energy is an important challenge, some methods should be used to reduce the electrical demand or shift the demand from peak-hours to off-peak hours. Ice storage systems are one of the devices which can be used for this purpose. In this article, a transient 3D numerical simulation was carried out to investigate the effects of two geometrical parameters of double helical coil heat exchanger in the charging process of an ice storage system with the volume of 15 L. These parameters were helical coil pitch length and the distance between inner and outer coils. The results indicated that with higher values for pitch length and inner and outer coils distance, compared to smallest values for these parameters, the distribution of formed ice in the storage improves and the rate of ice formation increases by 22.81% and 13.99%, respectively. Increasing these values can also retard the ice block formation which is an undesirable phenomenon in the external discharge process of the ice storage systems.

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Influence of Tube Arrangement on the Thermal Hydraulic Performance of a Membrane Helical-Coil Heat Exchanger

Cited by 11 publications

References 38 publications

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

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