Simulation and Test Comparison of Motherboard Refrigerant Cooling Radiator of Inverter Air Conditioner and Its Heat Dissipation Reliability Prediction
The main board chip of the inverter air conditioner outdoor unit adopts the traditional rib radiator and the re-frigerant 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:① the 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 refrigera-tion(48℃on the outdoor side),because there is no refrigerant flow in the refrigerant cooling radiator tube,the tempera-ture 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.
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