Solar Air Heater with Multiple V-Ribs
Solar Air Heater with Multiple V-Ribs
The thermal performance of a solar air heater is limited by the low heat transfer coefficient between the absorber plate and flowing air. To enhance heat transfer, turbulence is induced in the airflow; however, excessive turbulence increases pumping power and friction losses. V-shaped ribs create enhanced heat transfer by generating secondary flow cells, and increasing the number of ribs increases these flows. Introducing gaps in the ribs allows secondary flows to release and accelerate the main flow, further improving heat transfer. The current study investigates a multiple V-shaped rib roughness geometry with gaps, introducing the number of gaps (Ng) as a key parameter to optimize heat transfer performance.
The thermal performance of a solar air heater is limited by the low heat transfer coefficient between the absorber plate and flowing air. To enhance heat transfer, turbulence is induced in the airflow; however, excessive turbulence increases pumping power and friction losses. V-shaped ribs create enhanced heat transfer by generating secondary flow cells, and increasing the number of ribs increases these flows. Introducing gaps in the ribs allows secondary flows to release and accelerate the main flow, further improving heat transfer. The current study investigates a multiple V-shaped rib roughness geometry with gaps, introducing the number of gaps (Ng) as a key parameter to optimize heat transfer performance.
This reflects the balance between improving turbulence and minimizing friction losses, focusing on the influence of rib geometry and gaps in enhancing heat transfer in solar air heaters.
This reflects the balance between improving turbulence and minimizing friction losses, focusing on the influence of rib geometry and gaps in enhancing heat transfer in solar air heaters.
