关键词: 散热, 对流换热, 空调器, 变频驱动

Abstract: With the intensification of global warming, the cooling demand for air conditioning systems continues to rise. Meanwhile, the miniaturization and integration trends in electronic components have led to a significant increase in thermal loading on power devices mounted on variable frequency drive (VFD) boards. To address the thermal management challenges of VFD boards in low-power air conditioner outdoor units, first established a computational fluid dynamics (CFD) model of the existing design to evaluate its thermal performance. Based on thermal flow analysis, an optimization strategy was proposed, involving adjustments to the layout of air inlets and outlets as well as the direction of heat sinks, aiming to improve overall heat dissipation. The optimized design achieved a temperature reduction of 36.1 °C in critical components, with all devices meeting the required reliability criteria. As a result, the air conditioning system can operate stably at full frequency without performance degradation caused by overheating. Experimental results demonstrate that effective airflow management can significantly enhance the thermal performance of compact power electronic systems, thereby improving the overall efficiency and stability of air conditioning equipment.

Key words: Heat dissipation, Convective heat transfer, Air conditioner, Inverter circuit board