变频空调主板冷媒冷却散热器仿真与测试对比及其散热可靠性预测  

Simulation and Test Comparison of Motherboard Refrigerant Cooling Radiator of Inverter Air Conditioner and Its Heat Dissipation Reliability Prediction

作　　者：肖庆 陈振明 

机构地区：[1]珠海格力电器股份有限公司,珠海519070

出　　处：《日用电器》2024年第7期27-35,共9页ELECTRICAL APPLIANCES

摘　　要：对变频空调室外机主板芯片散热分析,分别采用传统肋片式散热器和冷媒冷却散热器进行数值模拟,同步开展实验验证。在不同工况下,仿真计算和实验测试结果初步表明:①制热工况时,冷媒冷却散热器满足可靠性要求。从仿真结果来看,相同功耗下,冷媒冷却散热器较肋片散热器温度升高明显,满足元器件温度不高于95℃的要求。但由于冷媒冷却散热器整体体积小,平均温度较高。②制冷工况时,冷媒冷却散热器整体优于肋片式散热器,特别是高温制冷、最大运行制冷等工况,冷媒冷却散热相对更优,控制器各元器件温度相比较低,对于整机性能和可靠性而言,更具优势。③模拟制冷工况无氟高温制冷时(室外侧48℃),因冷媒冷却散热器管内无制冷剂流动,此时冷媒冷却散热器温度可能高达107℃,温度高于95℃,但未达到功率元件结温的温度极限(一般高于125℃)。预测不满足可靠性要求,可以通过提高散热板的体积,表面积等散热设计,或者温控器等设定对应的保护逻辑,并加以实验验证,以期满足可靠性要求。The main board chip of the inverter air conditioner outdoor unit adopts the traditional rib radiator and the refrigerant cooling radiator for numerical simulation,and the experimental verification is carried out simultaneously.Under different working conditions,the simulation calculation and experimental test results show that:①the refrigerant cooling radiator meets the reliability requirements under heating conditions.From the simulation results,under the same power consumption,the temperature of the refrigerant cooling radiator is significantly higher than that of the finned radiator,which meets the requirement that the temperature of the components is not higher than 95℃.However,due to the small overall volume of the refrigerant cooling radiator,the average temperature is higher.②In refrigeration conditions,the refrigerant cooling radiator as a whole is better than the ribbed radiator,especially in high-temperature refrigeration,maximum operating refrigeration and other conditions.The refrigerant cooling and heat dissipation are relatively better,and the temperature of each component of the controller is relatively low.It has more advantages in terms of machine performance and reliability.③Simulate the refrigeration condition when there is no fluorine high temperature refrigeration(48℃on the outdoor side),because there is no refrigerant flow in the refrigerant cooling radiator tube,the temperature of the refrigerant cooling radiator may be as high as 107℃,and the temperature is higher than 95℃,but it does not reach the temperature limit of the junction temperature of the power element(generally higher than 125℃).The prediction may not meet the reliability requirements,and the corresponding protection logic can be set by improving the volume,surface area and other heat dissipation design of the heat dissipation plate,or the temperature controller,etc.,and the experimental verification,in order to meet the reliability requirements.

关 键 词：CFD 数值模拟 空调主板 散热片 冷媒冷却 可靠性 

分 类 号：TM925.12[电气工程—电力电子与电力传动]