The boundary condition boundary condition is set as follows: given the ambient temperature around the heat sink, the heat flux density at the center of the bottom of the plate is fixed. The numerical simulation results and the analysis of the bottom plate of the heat sink bottom plate have the same temperature trends, which are gradually reduced from the center to the sides. However, the maximum temperature of the bottom plate and the fins is 118.3 ° C, which is 15.1 ° C lower than the temperature of the aluminum radiator bottom plate of the same structure of 133.4 ° C, which fully demonstrates that the heat sink heat sink has a good heat dissipation capability. Optimization of External Structure of Radiator The design requirements for the flat heat pipe radiator in this paper are: when the heat dissipation is 150W, the temperature of the bottom plate is lower than 75 °C. In order to meet the design requirements and to improve the heat dissipation efficiency of the heat sink as much as possible, the following will optimize the design of the heat sink. The arrangement of the heat source of the bottom plate adopts a numerical simulation method, and the arrangement of the heat source of the bottom plate is changed according to actual conditions.
A new flat heat pipe radiator for outdoor LEDs. In order to prove the advantages of flat-plate heat pipe radiator in high-power LED heat dissipation, the commercial software Star-CD was used to numerically simulate the heat dissipation, and it was carried out with the same structure of aluminum radiator and hot plate-aluminum fin radiator. Comparison. By adjusting the heat source arrangement and external structure of the initial model, a flat heat pipe radiator with structural optimization and LED heat dissipation requirements is obtained. When the compressor is in normal operation, if the amount of airflow enters the interior of the impeller is smaller than the minimum airflow specified under that condition, then a part of the gas in the system pipe network will flow back into the compressor. It is called surge flow. Once the outlet pressure of the compressor is higher than the pressure in the system pipe network, the compressor will appear exhaust again, and the gas in the compressor system will periodically oscillate. The main oscillation shows The location is the unit and the connected pipes. These devices will have a large amplitude and have periodic oscillations. This engineering phenomenon is called surge. When the compressor is running, if the amount of suction gas of the compressor is reduced to a certain value, the compression ratio is lowered, causing the pressure inside the exhaust line to be much higher than the pressure at the outlet of the compressor, and the compressed gas will flow back to the compression. Machine, when the internal pressure of the pipeline is reduced, the flow direction of the gas changes.
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