Numerical modeling of an innovative arc shape rib based solar air heater

Moghadam, Hamid Kazemi; Ajarostaghi, Seyed Soheil Mousavi; Poncet, Sébastien

doi:10.1177/09544062211039541

Cited by 14 publications

(6 citation statements)

References 55 publications

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“…In recent decades, rough/corrugated/ribbed surfaces have been considered as one of the most effective passive heat transfer enhancement techniques for different systems [209][210][211][212][213][214]. Table 8 shows various examples of rough surfaces for heat transfer enhancement.…”

Section: Rough Surfacesmentioning

confidence: 99%

A Review of Recent Passive Heat Transfer Enhancement Methods

et al. 2022

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Improvements in miniaturization and boosting the thermal performance of energy conservation systems call for innovative techniques to enhance heat transfer. Heat transfer enhancement methods have attracted a great deal of attention in the industrial sector due to their ability to provide energy savings, encourage the proper use of energy sources, and increase the economic efficiency of thermal systems. These methods are categorized into active, passive, and compound techniques. This article reviews recent passive heat transfer enhancement techniques, since they are reliable, cost-effective, and they do not require any extra power to promote the energy conversion systems’ thermal efficiency when compared to the active methods. In the passive approaches, various components are applied to the heat transfer/working fluid flow path to improve the heat transfer rate. The passive heat transfer enhancement methods studied in this article include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), and nanofluids (mono and hybrid nanofluids).

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Section: Rough Surfacesmentioning

confidence: 99%

A Review of Recent Passive Heat Transfer Enhancement Methods

et al. 2022

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“…However, solar installation cost is high (collectors and receiver purchasing cost) and it gave power in all weather but its storage unit cost is also fairly high. 3 The solar power tower (SPT) is the newest CSP (concentrated solar power) technology. The SPT technology consists several sub systems such as thermal storage (optional), receiver, 75-150 m high tower, heliostats having 50-150 m 2 per heliostat area and this integrated a energy conversion system.…”

Section: Introductionmentioning

confidence: 99%

“…However, solar installation cost is high (collectors and receiver purchasing cost) and it gave power in all weather but its storage unit cost is also fairly high. 3…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of organic Rankine cycles integrated with solar based combined cycle: A thermodynamic and exergoenvironmental analysis

Khan

Mishra

Singh³

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present study, the two configurations of the combined intercooled cascade supercritical carbon dioxide (sCO2) cycle/organic Rankine cycle (ORC) (configuration-1) and the combined intercooled cascade sCO2 cycle/parallel double evaporator ORC (PDORC) (configuration-2) were considered for the comparison on the basis of thermodynamic performance. Solar power tower (SPT) was considered as heat source for both the configurations. The effects of SPT design parameters on the systems were investigated. It was concluded that the addition of basic ORC and PDORC to the standalone intercooled cascade sCO2 cycle enhanced the thermal efficiency by 2.26% and 6.66% respectively, at 950 W/m2 of direct normal irradiation (DNI). In the case of basic ORC and PDORC, the waste heat recovery ratios were 0.1197 and 0.1775, respectively. It was also discovered that configuration-2 performed better than configuration-1 in terms of waste heat recovery and its optimized thermal efficiency was found as 52.34%. An exergoenvironmental analysis also performed on the present systems. Exergoenvironmental impact index decreases from 1.6504 to 0.6801 with increase in DNI while the exergetic stability factor increase from 0.3773 to 0.5952 with DNI.

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“…Moreover, in V‐shaped angled baffles, the thermal efficiency of β = 90°, 60°, 45°, and 30° were 27%, 18%, and 13% more than no baffle case at Re = 2000, correspondingly. Kazemi Moghadam et al 29 proposed an innovative arc‐shaped ribs for the SAH. The heat transfer process in the proposed SAH was estimated numerically for Re = 6000–12,000.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Kadijani

Moghadam

Ajarostaghi

et al. 2022

Energy Science & Engineering

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In this numerical work, heat transfer characteristics of humid air in a rectangular channel as solar air heater equipped with V-shaped ribs has been investigated. The impacts of geometrical parameters of proposed ribs such as height, pitch, and angle relative to air flow direction, as well as relative humidity and Reynolds number of inlet humid air on thermal performance of proposed solar air heater have been evaluated. The numerical results have been achieved using commercial Computational Fluid Dynamics (CFD) code, ANSYS FLUENT 18.2, which works based on finite volume method. Outcomes shows that, over a wide range of operating conditions, utilizing ribs cause thermal boundary layer to separate and reattach, and eventually enhance heat transfer rate. Increasing the rib angle produces stronger secondary flows, leading to higher local velocities and greater heat transfer rate. Moreover, increasing the relative humidity of inlet air from 0% to 50% leads to improve heat transfer by up to 6%. As Reynolds number increases from 4000 to 12,000, average Nusselt number rises by 7.3% and 31.4% for rib pitches of 6 and 16 mm, respectively. The results demonstrate how thermal performance of a solar air heater can be improved by utilizing V-shaped ribs.

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Numerical modeling of an innovative arc shape rib based solar air heater

Cited by 14 publications

References 55 publications

A Review of Recent Passive Heat Transfer Enhancement Methods

A Review of Recent Passive Heat Transfer Enhancement Methods

Performance comparison of organic Rankine cycles integrated with solar based combined cycle: A thermodynamic and exergoenvironmental analysis

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

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