Numerical studies on the effect of delta-shaped obstacles’ spacing on the heat transfer and pressure drop in v-corrugated channel of solar air heater

Handoyo, Ekadewi Anggraini; Ichsani, Djatmiko; Prabowo,; Sutardi,

doi:10.1016/j.solener.2016.02.031

Cited by 73 publications

(15 citation statements)

References 17 publications

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“…For double pass operation, thermal efficiency was improved for all three types of collector whereas the improvement in the thermal efficiency was high in the simple solar collector as compared to the v-corrugated collector. Handoyo and Ichsani [4] investigated the vcorrugated duct with delta shaped obstacles. They showed that enhanced the friction factor and Nusselt number by 19.9 times and 3.46 times respectively and can be obtained by placing the obstacles on the collector with small spacing, and also concluded that the height of delta shaped obstacles was equal to its optimal spacing ratio.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of solar air heater equipped with louvered fins

Chand¹,

Chand²

2018

IJHT

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The current work deals with the thermal performance of louvered finned solar air collector. The study involves evaluating various parameters such as temperature rise, thermal efficiency, effective efficiency and insolation compared to that of plane solar air heater. It is observed that at minimum duct height and minimum fin spacing the thermal efficiency shows a noticeable enhancement but the effective efficiency reduced at higher mass flow rate, even may be less than plane solar air heater. This is because of higher pressure drop that occurs at higher mass flow rate. Further the result revealed that the increasing solar intensity leads to increase in temperature rise linearly while the solar intensity has a little effect on thermal efficiency for a given mass flow rate.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of solar air heater equipped with louvered fins

Chand¹,

Chand²

2018

IJHT

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“…Other factors are humidity of the surrounding air, method of drying, moisture diffusivity, and drying kiln structure (Bolaji & Olalusi, 2008;Şevik, 2013). In corrugated duct due to the formation of backflow and high velocity in the gap between obstacle and absorber plate flow becomes more turbulent and enhanced the convection heat transfer, in turn, improve efficiency but increase the air pressure drop (Handoyo et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Priyam and Chand, (2016) suggest that collector efficiency can be improved by attaching fins to the absorber to extend the heat transfer area. Handoyo et al, (2016) conclude from his analysis that application of obstacles to the solar air heater enhances the convection heat transfer between the air and the absorber plate due to turbulences. As a result, efficiency will be improved, but will increase the drop in air pressure.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

Desisa

Shekata

2020

Int. J. Renew. Energy Dev.

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The simplicity of solar flat plate air collector and freely availability of solar energy sources attracts attention to collector optimization. This study aims to evaluate the effect of double pass airflow on the performance of flat plate air collectors. Indirect type solar dryer performance characteristics analysis was done through CFD simulation with three different shapes (smooth, rough, and V-grooved) keeping the collector insulated and drying chamber act as a vertical chimney. The average thermal efficiency of the V-grooved surface, smooth surface, and rough surface is 90%, 78%, and 62% respectively. The total area of the collector is 1.20 * 2.0 = 2.60 m2 with the drying cabinet 1.20 * 0.65 * 1.00 m (width * depth * height) and 0.005m thick glass cover. Observed pressure drop at the inlet of the drying chamber is high in the case of smooth surface, medium in a rough surface, and low in a v-grooved plate that will allow enough gas pressure to pass through all the compartment of the process at full-scale. The air mass flow rate is the most important and effective factor during drying. The humidity of the air, as well as air velocity, is also an important factor for improving the drying rate.

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“…However, there are very few studies on baffle caused to increase heat transfer by composing the turbulent flow in the channel at the low Reynolds number. Handoyo et al [7] numerically researched the heat transfer and pressure drop characteristics of delta-shaped obstacles for V-corrugated channels by taking into considering interval between obstacles. Determined ratio of the interval to height of the deltashaped obstacles was varied range from 0.5 to 2.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and pressure drop evaluation of different triangular baffle placement angles in cross-corrugated triangular channels

Karabulut

2020

Therm sci

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Plate heat exchangers have a widespread usage and the simplest parallel plate channel structures. Cross-corrugated ducts are basic channel geometries used in the plate heat exchangers. In this study, the increasing of heat transfer from the cross-corrugated triangular ducts by inserting triangular baffles with different placement angles into the channel upper side and pressure drop have been numerically investigated. Numerical calculations have been carried out to solve Navier-Stokes and energy equations by employing k-ε turbulence model as 3-D and steady with ANSYS-FLUENT program. While inlet temperature of the air used as working fluid is 293 K, constant surface temperature values of the the lower corrugated channel walls are 373 K. The height of the baffle and apex angle of the corrugated duct have been taken constant as 0.5 H and 60°, respectively. Investigated Reynolds number range is 1000-6000 while the baffle placement angles are 30°, 45°, 60°, and 90°. Numerical results of this study are within 3.53% deviation with experimental study existed in literature. The obtained results have been presented as mean Nusselt number temperature and pressure variations of the fluid for each baffle angle. The temperature and velocity vector contour distributions have been also assessed for different Reynolds numbers and baffle angles. The value of the Num for the corrugated channel with 60° baffle angle is 8.2% higher than that of the 90° for the Re = 4000. Besides, for Re = 1000 the value of the pressure drop is 39% lower in the channel with 60° baffle angle than that of 90°.

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Numerical studies on the effect of delta-shaped obstacles’ spacing on the heat transfer and pressure drop in v-corrugated channel of solar air heater

Cited by 73 publications

References 17 publications

Performance evaluation of solar air heater equipped with louvered fins

Performance evaluation of solar air heater equipped with louvered fins

Performance Analysis of Flat-Plate and V-groove Solar Air Heater Through CFD Simulation

Heat transfer and pressure drop evaluation of different triangular baffle placement angles in cross-corrugated triangular channels

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