Experimental and numerical thermal performance in solar receiver heat exchanger with trapezoidal louvered winglet and wavy groove
| dc.contributor.author | Promvonge, Pongjet | |
| dc.contributor.author | Promthaisong, Pitak | |
| dc.contributor.author | Skullong, Sompol | |
| dc.date.accessioned | 2026-08-06T10:36:48Z | |
| dc.date.available | 2026-08-06T10:36:48Z | |
| dc.date.issued | 2022-04-01 | |
| dc.description.abstract | A numerical and experimental study on the thermal–hydraulic performance of a solar receiver heat exchanger (SRH) equipped with a newly designed longitudinal-vortex generator, namely, trapezoidal louvered winglet and wavy groove placed on the absorber has been carried out. The relevant parameters included three pitch ratios of winglets/grooves (P/H = P<inf>R</inf> = 1, 1.5 and 2), four winglet blockage ratios (b/H = B<inf>R</inf> = 0.3–0.45) at a single attack angle of winglet/groove, α = 45°. The experimental outcome showed that the trapezoidal winglet (TW) together with the wavy groove at P<inf>R</inf> = 1, B<inf>R</inf> = 0.45 gives the greatest friction factor and the heat transfer around 108.1 and 9.35 times over the smooth SRH channel, respectively while that at P<inf>R</inf> = 1.5, B<inf>R</inf> = 0.4 provides the optimal thermal performance at about 2.6. To increase further the performance, the TW at optimal conditions was modified by punching the TW at its centroid to be a square-hole and then covering the back-end hole partially like a louver, called the trapezoidal louvered winglet (TLW). The TLW elements were mounted on the grooved absorber plate with eight louver angles (θ = 0°–90°). The investigation indicated that among the louver angles, the θ = 20° yields the greatest heat transfer up to 9.18 times above the smooth SRH whilst its friction loss is lower than the θ = 0°(solid-winglet). Hence, the TLW and wavy groove at θ = 20° provided the maximum thermal–hydraulic performance around 2.76. To understand the flow and thermal patterns, a 3D flow computation was also carried out and their results were validated with available measurements. | |
| dc.identifier.citation | Solar Energy, 236, 153-174, 2022 | |
| dc.identifier.doi | 10.1016/j.solener.2022.02.052 | |
| dc.identifier.issn | 0038092X | |
| dc.identifier.other | 2-s2.0-85125788371 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/13165 | |
| dc.source | Solar Energy | |
| dc.subject | Absorber plate | |
| dc.subject | Louvered winglet | |
| dc.subject | Solar receiver | |
| dc.subject | Thermal performance | |
| dc.subject | Vortex generator | |
| dc.title | Experimental and numerical thermal performance in solar receiver heat exchanger with trapezoidal louvered winglet and wavy groove | |
| dc.type | Article |