Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate

Rajaseenivasan, T.; Srinivasan, S.; Srithar, K.

doi:10.1016/j.energy.2015.07.020

Cited by 95 publications

(28 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the most successful nonreversible process is the case of the flat plate collector, which has the smallest efficiency. Rajaseenivasan et al have investigated the effect of different types of absorber plates on the thermal performance of solar collectors. Circular and V‐shaped fins of absorber plates have been considered in this study.…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Khalil

Obaid

Dawood

2019

Heat Trans. Asian Res.

View full text Add to dashboard Cite

In the current study, an experimental analysis of exergy performance for different absorber plates is done. Three types of absorber plates are supplied with different fin arrangements with a variable air mass flow rate. The exergy analysis to evaluate the exergy performance of the solar air heaters uses experimental data for conventional and finned solar air collectors with different arrangements of fins. The main aim of the current study is to compare the exergy performance of the conventional solar air collector with those equipped with fins. The introducing of the fins in different arrangements enhances the absorber surface area, which leads to increased heat transfer. Also, fins induce air turbulence in the flow field, which improves the exergy performance of solar air collector. It is found that the exergy reduces and exergy efficiency enhances with increasing the airflow rate. The traditional flat absorber plate has undesirable exergy loss and exergy efficiency for all ranges of airflow rates. Thus, the flat plate collector presents the most substantial irreversibility, for which the exergy efficiency is the least. However, the results show that the exergy efficiency of inclined staggered turbulators is higher than that of in-line and staggered turbulators. The optimal value of exergy

show abstract

Section: Introductionmentioning

confidence: 99%

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Khalil

Obaid

Dawood

2019

Heat Trans. Asian Res.

View full text Add to dashboard Cite

show abstract

“…The experimental result displays that the highest heat transfer and friction factor for all V‐baffle vortex generators provide the smaller PR . Rajaseenivasan et al 56 considered a single‐pass solar air heater with circular and V‐shape inserts. The absorber plate is included six different configurations of circular and V‐shape turbulators.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

2020

View full text Add to dashboard Cite

In the present study, the effect of utilizing two different types of baffles in the channel of the solar air heater is investigated numerically. The studied baffles include angled rectangular baffles and angled V-shaped baffles, which are mounted on the bottom and top walls of the duct, respectively. Both considered baffles were evaluated separately which the studied parameter in each section was the angular position of baffles. Finally, the best-obtained results of both sections were compared to each other. The results indicated that in the rectangular model by comparison between 90°model and no baffle, it was found that the pressure drop and average Nusselt number increase 316.67% and 148.15%, respectively at Reynolds number (Re) = 2000. Also, in V-shaped angled baffles, the thermal efficiency of β = 90°, 60°, 45°, and 30°are 27%, 18%, 13% higher than no baffle channel at Re = 2000, respectively. Furthermore, at low Re (about Re below 300), utilizing baffles into the channel had no effect on the thermal efficiency of the system compared to the no baffle channel. However, at high Re, it was found that the highest thermal efficiency occurred in the model of rectangular baffles with an angle of 90°. K E Y W O R D S baffle, heat-transfer enhancement, numerical simulation, solar air heater

show abstract

“…They reported that the average Nuseelt number increases around 6 -101% and the total thermal resistance decreases around 3 -40% for the aligned fan-shaped ribs, while the average Nusselt number enhances around 4 -103% and total thermal resistance reduces around 2 -42% for the offset fan-shaped ribs when compared with the smooth channel. Rajaseenivasan et al (2015) compared between circular and V-shaped tabulators on heat transfer and pressure loss in a solar air heater channel. Chai et al (2016b) numerically investigated on convective heat transfer in a microchannel heat sink with offset ribs for laminar flow regime (190 ≤ Re ≤ 838).…”

Section: Introductionmentioning

confidence: 99%

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Jedsadaratanachai¹,

Boonloia²

2018

Frontiers in Heat and Mass Transfer

View full text Add to dashboard Cite

Numerical analysis on flow configuration, heat transfer behavior and thermal performance in the heat exchanger tube equipped with various flow attack angles of the inclined wavy surface are presented. The laminar flow (Re = 100 -1200) and turbulent flow (Re = 3000 -10000) are considered for the present investigation. The flow attack angles of the inclined wavy surface are varied as 15 o -60 o . The finite volume method with SIMPLE algorithm is selected to evaluate the current problem. The numerical results are reported in terms of flow and heat transfer mechanisms. The performance evaluations in forms of the Nusselt number ratio (Nu/Nu 0 ), friction factor ratio (f/f 0 ) and thermal enhancement factor (TEF) are also concluded. As the results, the vortex flow, impinging flow and thermal boundary layer disturbance are detected when inserted the inclined wavy surface in the heat exchanger tube. These behaviors effect for the augmentation of the heat transfer rate, pressure loss and thermal performance. The optimum flow attack angle of the inclined wavy surface for the laminar and turbulent flows are also concluded.

show abstract

Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate

Cited by 95 publications

References 39 publications

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Contact Info

Product

Resources

About