| Abstract [eng] |
Heat transfer enhancement in solar technologies have been carried put in some applications all around the world. A possibility for increasing heat transfer with fluid without external energy supply is an endeavor in solar collector with battles. When fluid flows in a channel, baffles break the laminar sub-layer and create wall turbulence flow separation and resistance and augment the heat transfer. A numerical modelling was carried out to study the thermal performance of a back-pass air collector with rectangular baffles. Construction of the model was improved by baffles which were set out in 0,08, 0,16 and 0,24 m distance. Attachment of baffles create a technique witch increase heat transfer between the fluid and the absorber in the solar collector. To solved this, was used the finite volumes method and low Reynolds number k-ε model in ANSYS FLUENT program. In this paper, the results indicate that this collector design increased the enhancement of heat transfer process and solar collector’s efficiency. Also, this study revealed that the flow and heat transfer characteristics are strongly dependent on mass flow rate of air. |
