Numerical investigation on performance improvement of latent heat exchanger with sextant helical baffles

Chen, Dongming; Zhang, Ruiqi; Cao, Xing; Chen, Lei; Fan, Xiyan

doi:10.1016/j.ijheatmasstransfer.2021.121606

Cited by 15 publications

(4 citation statements)

References 29 publications

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“…These significant amounts correspond to the considerable pressure losses that are yielded by the abrupt change in the airflows at the level of the 2nd baffle. (7) The most significant values of Nu and f are observed on the upper surface of the exchanger, due to the highest temperature and speed gradients in this area. (8) The achieved performance has been compared to that of several previous studies.…”

Section: Discussionmentioning

confidence: 92%

“…The insertion of baffles inside the flow duct in HEs is known as an efficient technique to promote the energy performance of such devices [4][5][6]. The presence of baffles, the so-called vortex generators, yields turbulence and lengthens the fluid particle trajectories, which results in enhanced convective thermal exchange and efficiency [7][8][9]. Some research studies have been carried out on various types of HEs and their implementations.…”

Section: Introductionmentioning

confidence: 99%

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Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

et al. 2021

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Details on the hydrothermal characteristics of turbulent flows in a solar channel heat exchanger (CHE) are highlighted. The device has transverse T-shaped vortex generators (VGs). Two staggered VGs (baffles) are inserted on the lower and upper walls of the CHE. The working fluid is Newtonian and incompressible, with constant physical properties. The ANSYS Fluent 17.0 is utilized in this survey. The second-order upwind and QUICK schemes were utilized to perform the discretization of pressure and convective terms, respectively. The SIMPLE algorithm was employed to achieve the speed-pressure coupling. The residual target 10−9 was selected as a convergence criterion. The effects of the T-VGs’ geometrical shape and Reynolds numbers were inspected. At the baffle level, the wall effect was augmented due to the reduction of the passage area of flows, which is estimated here to be 55%, resulting thus in a considerable resistance to the movement of fluid particles. The thermal distribution is highly dependent on the flow structures within the CHE. Since the fluid agitation yields an enhanced mixing, it allows thus an excellent heat transfer. The most considerable rates of thermal transfer were obtained with high Re, which resulted from the intensified mixing of fluid particles through the formation of recirculation cells and the interaction with the walls of the T-VGs and the CHE. The T-baffles with intense flow rates yielded negative turbulent speeds and intensify the fluid agitation, which improves the thermal exchange rates.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

et al. 2021

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“…In addition, the helical shape has a very important streamline compared to direct barriers, and this has been confirmed by most recent studies [18][19][20][21]. It is used in the structure of the heat exchangers to enhance the cooling process.…”

Section: Introductionmentioning

confidence: 80%

Behaviour of a Non-Newtonian Fluid in a Helical Tube Under the Influence of Thermal Buoyancy

Ramla

Laidoudi

Bouzit

2022

Acta Mechanica Et Automatica

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This work is an evaluative study of heat transfer in the helical-type heat exchanger. The fluid used is non-Newtonian in nature and is defined by Oswald’s model. The work was performed numerically by solving each of the Navier–Stokes equations and the energy equation using the package ANSYS-CFX. Following are the aspects that have been dealt with in this paper: the effects of thermal buoyancy, fluid nature and the tube shape on the heat transfer, and the fluid comportment. The interpretation of the obtained results was done by analyzing the isotherms and the streamlines. The mean values of the Nusselt number were also obtained in terms of the studied parameters. The results of this research enabled us to arrive at the following conclusion: the intensity of thermal buoyancy and the nature of the fluid affect the heat transfer distribution but keep the overall rate of heat transfer the same.

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“…The experimental facility is flexible and able to analyze different configurations of TES units for domestic heating applications employing water as the HTF. However, other fluids such as glycol mixtures may be adopted to improve heat transfer during discharging and charging processes [21], [22]. The test-rig allows experiments to be undertaken in a safe way, the impact of hydraulic and thermal conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

An experimental facility for latent heat thermal energy storage units

Bastida

Amanda

Ugalde‐Loo

et al. 2022

2022 IEEE 7th International Energy Conference (ENERGYCON)

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Assessing the performance of thermal energy storage (TES) units beyond software simulation requires testing in a controlled environment, with specific operating modes, and in safe conditions. A test-rig with an energy source and a monitoring system is very helpful to conduct experimental tests to assess the performance of TES systems. To this end, this paper presents an experimental facility for the study of latent heat TES (LH-TES) units. Emphasis is placed on the individual elements of the facility, which includes plumbing components and electric heaters to support the charging process of the TES units. Water is used as the heat transfer fluid (HTF). To demonstrate the capabilities of the test-rig, an LH-TES prototype for heating applications is used. Four different configurations and three operating modes are assessed: charging, discharging and discharging-mixing. The wide range of the experiments possible with the developed facility enables testing of early designs of LH-TES units ahead of deployment in real thermal networks.

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Numerical investigation on performance improvement of latent heat exchanger with sextant helical baffles

Cited by 15 publications

References 29 publications

Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

Behaviour of a Non-Newtonian Fluid in a Helical Tube Under the Influence of Thermal Buoyancy

An experimental facility for latent heat thermal energy storage units

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