Akademik Veri Yönetim Sistemi
4th International Graduate Studies Congress, Uşak, Türkiye, 5 - 08 Haziran 2024, ss.50-58
In today's world, where energy dependence is increasing, and energy plays an
unquestionably important role in even the most basic needs of people, obtaining maximum
benefit from resources and developing technology accordingly is essential. Renewable energy
sources are foreseen as one of the most critical factors in the present and the future in terms of
ensuring sustainability and contributing to today's world of consumption. In this context, the
sun is one of the most critical resources, the limits of which we cannot even predict. Today,
many technologies have been developed to benefit from this resource. For this reason, the
collectors used to collect solar energy and the thermal performance of these collectors under
various conditions have shaped the main subject of this study.
When the literature was reviewed, it was seen that the thermal performance of panels was
initially directly associated with wind velocity. Still, new studies have gradually been shown to
depend on other factors. In this numerical study, a house with reduced dimensions was scaled,
and a working environment was created by placing a solar collector on a particular area of the
roof of this house. With the ANSYS Fluent numerical analysis program, this panel was analyzed
under different wind velocities, roof slope angles, angles of attack, and scale conditions. With
the results, the effects of velocity and variables other than velocity on thermal performance
were reported. First of all, existing studies in the literature were modeled and analyzed, and the
validation of the study was ensured. Then, a 1:200 scale model house was created, and a square
collector was placed on a particular roof area to create a working environment. Then, the heat
transfer by convection from this collector surface was examined for different wind attack
angles. In the 1:200 scale model, the square-type collector placed on a particular area of the
roof is numerically calculated for the wind attack to the collector from 8 different angles (β =
0o, 30o, 45o, 90o, 120o, 135o, 150o, 180o) when the roof slope angle is α = 25o has been analyzed.
These analyses were conducted at ten different Reynolds numbers, provided the Reynolds
number was between 17,000 and 80,000.
As a result, in the analysis performed, the average heat flux value on the panel was calculated
from the program, and using this value, the heat transfer coefficient (h), Nusselt number (Nu),
and Colburn-j factor were calculated. According to the equations and graphs obtained, it has
been determined that thermal performance depends not only on velocity but also on collector
properties, characteristic length, slope, direction of incidence, angle of attack, physical
properties of the fluid, flow type, etc.