Thermal Design of an Airtight Cabinet Based on Heat Exchanger

In order to improve the electromagnetic compatibility of the cabinet and provide a good operation environment for the equipment, an airtight cabinet with secondary heat exchange based on a heat exchanger is designed in this paper. First, the air volume for heat dissipation is calculated according to the heat consumption of the equipment in the cabinet and the environment requirements. Then, the wind tunnel is designed based on the structure of cabinet and case. The heat exchanger is placed at the bottom of the cabinet, with air supply at the front and air return at the rear. The rear of the case is equipped with a fan, air in from the front and air out at the rear. The cold air is supplied to each case from the heat exchanger, and the heat is recovered by the heat exchanger and exchanged with external liquid cooling equipment to form a wind tunnel for heat dissipation in the cabinet isolated from the external environment. Finally, the thermal simulation and thermal test are carried out for the cabinet by ANSYS Icepak software. The results show that when the temperature difference between the air inlet and outlet is about 10 ℃, the airtight cabinet has 2 kW heat dissipation capacity, which meets the design requirements, the design of internal wind tunnel of the cabinet is reasonable and there is no air return or short circuit. The comparison between the test results and the simulation results shows that the simulation error is within 5% and the simulation accuracy is high, which can provide a reference for subsequent design.