Abstract: With the wide application of rooftop in the North American market, the thermal failure of inverter controllers under high power consumption is becoming increasingly prominent, which seriously affects the stability and reliability of equipment operation. Based on the characteristics of the heat dissipation structure of rooftop, the theoretical analysis model of the heat distribution and thermal characteristics of the whole machine is established, the radiator and heat dissipation air duct of the whole machine are designed, and the temperature of the heating components is calculated by thermal simulation, and the test results verify the accuracy of the theoretical model and simulation analysis, which provides theoretical basis and engineering guidance for the design of rooftop heat dissipation system.

Key words: Rooftop air conditioner, Radiator design, Heat dissipation duct, Thermal simulation