The domestic refrigerator is one of the most home appli-ance used and the enhancement in its performance will have a sig-nificant effect on energy saving and the environment. Preserving food at low and uniform temperatures is especially important to avoid Food spoilage and decreases the microorganisms. The aim of this study is to investigate numerically different duct shapes to achieve an efficient cooling in the refrigerator and keep the temper-ature at the required range, using software called SIMULIA. The numerical model was developed to simulate the refrigeration sys-tem accurately, porous media and heat balance techniques were combined to the conservation equation to simulate the exact bound-ary conditions for the refrigerator system with evaporator and multi duct system. The model is validated by experimental results (top-freezer refrigerator) with an accepted agreement between them. In sequence, the effect of three different duct shapes were studied numerically: R2 1/3 W × 2/3 H, R3 1/3 W × 1/3 H and R4 1W×1H. The model combines surface areas for R1 keep same orig-inal design. The result shows that the best temperature uniformity is found in case 3.