Overview of V-RIB geometries in solar air heater and performance evaluation of a new V-RIB geometry

Jain, Piyush; Lanjewar, Atul

doi:10.1016/j.renene.2018.10.001

Cited by 57 publications

(9 citation statements)

References 19 publications

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“…Bahiraei et al [4] selected V-pattern ribs combined with nanofluid to improve the second law characteristics of fluid flow behavior in a square channel. Jain and Lanjewar [5] presented the overview of V-pattern rib geometries in a solar air heater and performance analysis. The effects of relative roughness pitches with single relative staggered rib were considered.…”

Section: Introductionmentioning

confidence: 99%

Effects of Baffle Height and Baffle Location on Heat Transfer and Flow Profiles in a Baffled Duct: A CFD Analysis

Boonloi

Jedsadaratanachai

2022

Modelling and Simulation in Engineering

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CFD analysis of flow and heat transfer characteristics in a baffled duct is reported. The baffle locations ( s = 0.05 H – 0.40 H ), flow paths (V-apex directing Downstream or VD and V-apex directing Upstream or VU), and baffle heights ( b = 0.05 H – 0.30 H ) are investigated in the laminar flow regime with the Reynolds number based on the entry conditions between 100 and 2,000. Solutions of the present work are obtained by the finite volume method (a commercial code). Key mechanisms such as fluid streams, impinging streams, and disturbed thermal boundary layer in the baffled duct are observed. The baffle locations have high impact on flow and heat transfer behavior. The best heat transfer rate of the baffled duct is 15.55 times higher than that of the general duct with no baffle, while the optimum TEF is 4.06.

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Section: Introductionmentioning

confidence: 99%

Effects of Baffle Height and Baffle Location on Heat Transfer and Flow Profiles in a Baffled Duct: A CFD Analysis

Boonloi

Jedsadaratanachai

2022

Modelling and Simulation in Engineering

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“…They concluded that the higher rib height and smaller rib spacing give lower exergy destruction and increases the second low efficiency. Jain and Lanjewar [7] presented that the maximum enhanced heat transfer of 2.30 times above the base case is observed for a solar air heater equipped with V-ribs. Jin et al [8] numerically investigated the augmented heat transfer in a solar air heater with multiple-shaped ribs.…”

Section: Introductionmentioning

confidence: 99%

Case Studies on Enhanced Heat Transfer in a Square Duct with Modified V-Shaped Ribs (MVR): A CFD Analysis

Boonloi

Jedsadaratanachai

2022

Modelling and Simulation in Engineering

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This research presents structural improvement of V-shaped ribs for a tested square duct (TSD). The V-shaped ribs, which are inserted at the middle of the TSD (called type A), and the V-shaped ribs, which are placed on the opposite TSD walls (called type B), are modified to increase the structural stabilization. The effects of rib height to duct height, b / H = 0.05 – 0.30 ; V-shaped bar thickness to duct height, a / H = 0.025 and 0.050; and flow directions (V-Upstream and V-Downstream) are considered. The new design of the V-shaped ribs is called “modified V-shaped ribs or MVR.” The present problem is solved by the numerical method (commercial code). The flow and heat transfer features of the TSD are illustrated. The numerical result reveals that the MVR give both flow and heat transfer patterns similarly as the general V-shaped rib. The impinging flows, swirling flows, and disturbing thermal boundary layer, which lead to enhanced heat transfer, are observed. Over the investigated range, the enhanced heat transfer about 18.12 times above the smooth duct with the optimal thermal enhancement factor about 4.16 is detected.

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“…The authors noted that the heat transfer coefficient and instantaneous energy efficiency of the SAH were higher in the case of the v-shaped groove air heater. The THP characteristics of a SAH roughened by multiple v-shaped ribs were also investigated in detail [ 33 , 34 ]. It was reported that the main geometrical parameters of the channel and rib affect the optimal span-wise rib number.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Behura

Mohanty

Singh³

et al. 2022

Materials

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In recent years, sunlight has been used in several fields such as photovoltaic cells, flat plate collectors, solar cookers, green buildings, and agricultural applications. Improved thermal performance has been seen which comes of three sides absorber plate with glass cover compared to the traditional one. This paper presents the Nusselt (Nu) number, collector efficiency factor (CEF), and collector heat removal factor (CHRF) for the optimal solution of three sides artificially roughened solar air heater. Five input variables such as Reynolds (Re) number, relative roughness pitch, relative roughness height, mass flow rate, and air temperature of the duct are taken into account for improved efficiency optimization of collector, collector heat removal factor, and Nu number. Technique for order of preference by similarity to ideal solution (TOPSIS) technique is used to identify the best alternative amongst a number of performance measures by converting them into an equivalent single variable. Moreover, the results revealed the high accuracy of the CEF, CHRF, and Nu number of 75–80%, 74–78%, and 63–71%, respectively. Meanwhile, it has been also observed that roughness Re number varies between 12,500 and 13,500, and height of relative roughness is 0.0245, including pitch of relative roughness 10 along with the rate of mass flow is 0.041 kg/s.

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Overview of V-RIB geometries in solar air heater and performance evaluation of a new V-RIB geometry

Cited by 57 publications

References 19 publications

Effects of Baffle Height and Baffle Location on Heat Transfer and Flow Profiles in a Baffled Duct: A CFD Analysis

Effects of Baffle Height and Baffle Location on Heat Transfer and Flow Profiles in a Baffled Duct: A CFD Analysis

Case Studies on Enhanced Heat Transfer in a Square Duct with Modified V-Shaped Ribs (MVR): A CFD Analysis

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

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