Inevitably causing an increase in pressure drop, resulting in a corresponding increase in fan power consumption

In the asymmetric arrangement, most of the air flow is selected from the fins with less resistance, the diversion and disturbance of the blinds are smaller, the air takes less heat, and at the same time, most of the air passes between the fins, the blinds The hindrance effect on air is small, indicating that when the louver fins are asymmetrically arranged, the heat transfer performance is poor, and the flow resistance performance is good. When symmetrical arrangement, the numerical calculation results show that the air flow mainly flows along the direction of the louver, and the louver plays a good role of diversion and disturbance, which is more conducive to heat transfer, but the flow resistance is poor. The numerical simulation results of the heat transfer analysis fins show that the heat transfer factor and heat transfer amount of symmetrically arranged louver fins are higher than that of the asymmetrically arranged louver fins under the same mass flow rate and air inlet temperature, and the heat transfer performance is better. Asymmetrically arranged louver fins. As can be seen from the simulation results, as the air inlet velocity increases, the heat transfer amount of the louver fins gradually increases. The heat transfer rate when the air inlet speed is divided is 14.7% and 14.5% higher than that of the asymmetric arrangement.

The pressure drop analyzes the air side pressure drop corresponding to different air inlet speeds when the louver fins are symmetrically arranged and asymmetrically arranged. The simulation results show that when the louver fins are symmetrically arranged and asymmetrically arranged, the air side pressure drop increases with the increase of the air inlet velocity and is parabolic. However, at the same air inlet speed, due to the symmetrical arrangement, the guiding and turbulence of the louver to the air is stronger than that of the asymmetric arrangement, and the collision between the air molecules is more severe, resulting in the air side pressure drop ratio asymmetric when the louver is symmetrically arranged. High when placed. And as the air inlet speed increases, the kinetic energy of the air increases, and the air side pressure drop difference of the two arrangements is also more obvious. At different air inlet velocities, the pressure drop during symmetric arrangement is 29.3%, 28.8%, 28.7% higher than that of the asymmetric arrangement. Comprehensive performance analysis The performance of the louvered finned radiator is determined by the heat transfer and flow resistance characteristics. It can be seen from the numerical simulation results that the heat transfer performance of the louver is better than that of the asymmetric arrangement, but inevitably causes an increase in pressure drop. Therefore, the power consumption of the fan is also increased accordingly.

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