Heat transfer in solar air duct with multi-V-ribbed absorber and grooved back-plate
| dc.contributor.author | Promvonge, Pongjet | |
| dc.contributor.author | Khanoknaiyakarn, Chitakorn | |
| dc.contributor.author | Sripattanapipat, Somchai | |
| dc.contributor.author | Skullong, Sompol | |
| dc.date.accessioned | 2026-08-06T10:32:23Z | |
| dc.date.available | 2026-08-06T10:32:23Z | |
| dc.date.issued | 2021-04-01 | |
| dc.description.abstract | The article presents an experimental study on heat transfer and friction behaviors in a solar air duct fitted with multiple V-shaped ribs on the absorber and delta-grooves on the back plate. Measurements were carried out in the test duct having a cross-section of width, W = 300 mm and height, H = 27 mm. The air flow rate inside the duct was varied to have Reynolds numbers based on the duct hydraulic diameter from about 7000 to 30,000. Two vortex flow devices: rib and groove turbulators, were introduced to generate the vortex flows along the duct. In the test duct, the upper/absorber plate having a constant heat-flux was mounted repeatedly by multiple V-shaped thin ribs with an attack angle (α) of 45° relative to main flow direction while the lower/back plate was grooved periodically in the delta/triangular shape with an attack angle (θ) of 60°. In the present investigation, the geometrical parameters of the ribs included three different rib- to duct-height ratios (e/H = B<inf>R</inf> = 0.108, 0.162 and 0.217) and three rib-pitch to duct-height ratio (P/H = P<inf>R</inf> = 1.0, 1.5 and 2.0). The experimental results have shown that the duct with the V-ribbed absorber at B<inf>R</inf> = 0.217, P<inf>R</inf> = 1 in conjunction with the delta-grooved back plate has the greatest heat transfer and pressure loss. However, the use of the combined devices with P<inf>R</inf> = 1, B<inf>R</inf> = 0.108 leads to the highest thermal performance and also provides greater heat transfer and thermal performance than employing the V-rib or the delta-groove alone. | |
| dc.identifier.citation | Chemical Engineering Research and Design, 168, 84-95, 2021 | |
| dc.identifier.doi | 10.1016/j.cherd.2021.01.028 | |
| dc.identifier.issn | 02638762 | |
| dc.identifier.other | 2-s2.0-85101316070 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/11974 | |
| dc.source | Chemical Engineering Research and Design | |
| dc.subject | Delta-groove | |
| dc.subject | Heat transfer | |
| dc.subject | Thermal performance | |
| dc.subject | Turbulent flow | |
| dc.subject | V-rib | |
| dc.title | Heat transfer in solar air duct with multi-V-ribbed absorber and grooved back-plate | |
| dc.type | Article |