Cooling Technology Development For Inverter Controller In VRF Conditioner Based On Heat Pipe Heat Sink

VRF air conditioners rely on inverter controllers for intelligent refrigerant allocation and control.The inverter controllers generate heat during operation and the heat generated must be dissipated in time,otherwise the controller temperature will be too high and the AC machine will shut down.Due to the large amount of heat generated by the inverter controller,the scattered heat sources distribution,and the small space for heat dissipation,it is difficult for the inverter controller to dissipate heat.The current heat dissipation technology used for the heat dissipation of inverter controllers cannot solve the problem of heat dissipation of distributed heat sources of inverter controllers due to low heat dissipation efficiency or low stability.Considering that the heat pipe has high thermal conductivity and high stability,the idea of developing a heat pipe heat sink to solve the problem of distributed heat source heat dissipation of VRF AC inverter controller is proposed.Based on this idea,by analyzing the heat dissipation environment of the VRF AC external machine and the heat dissipation requirements of the inverter controller,a heat pipe heat sink design method for distributed heat sources of inverter controller is proposed.In addition,a simulation model of heat pipe heat sink for inverter controller in VRF AC is established,which consists of a heat dissipation environment model,a chip model,a heat pipe model,and a heat sink model.By comparing simulation results with experimental results,the average error of the simulation model is 4.5%,showing that the model is accurate and reliable,which can be used in the development and application research of heat pipe heat sink for VRF AC inverter controllers.For a specific VRF air conditioner inverter controller case,positive Utype heat pipe heat sink and oblique U-type heat pipe heat sink are designed.Through CFD simulation and experimental verification,it is verified that heat pipe heat sink can solve the heat dissipation problem of distributed heat sources of inverter controller.By comparing results of plate-fin heat sink,the heat dissipation capacity of the heat pipe radiator is 12.5% higher than the plate-fin heat sink,and the temperature uniformity of heat pipe heat sink is 47.5% higher than the plate-fin heat sink.