Abstract
Trombe wall can be applied for solar energy saving for ventilation purpose and to boost the performance of classic unit, it was combined with paraffin layer and fins in this study. The nanoparticles of alumina have been loaded into pure paraffin (RT18HC). To involve the existence of solar irradiation, two heat generation terms were added in governing equations of glass and absorber layers. Also, radiative and convective heat losses have been involved in boundary condition. Unsteady turbulent air flow within the domain has been simulated and for modeling of various layers, temperature equations with incorporating heat sources have been applied. Two shapes of fins (I and Y) with various numbers have been applied. The impacts of thickness and length of the fins as well as position of paraffin layers have been scrutinized. With assuming equal volume of paraffin, comparison of two configurations showed that system with Y-shaped fins leads to higher liquid fraction. Also, temperature of domain in existence of Y-shaped fins has lower value which leads to lower heat loss. With implement of best configuration, the amount of heat capacity augments about 28.41% at 17:00.
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