Contact the normal operation of the thermal resistance device. To a large extent depends on the quality of the assembly between the device and the heat sink. The mounting surface of the heat sink must have good contact with the device. To form a good conductive surface and thermal conductive surface. Due to the different capacities of power electronic devices, different use conditions, different appearance structures and varieties, their installation forms are also different. The relationship between the contact thermal resistance and the device packaging form is different, and the contact thermal resistance is also different.
Requirements for electronic radiator selection:
Good thermal performance. The greater the heat transfer coefficient of the radiator, the greater the heat dissipation capacity, indicating that its thermal performance is better. Therefore, the heat transfer coefficient of the radiator is an important parameter to measure the thermal performance of the radiator. We hope that the heat transfer coefficient of the radiator should be larger.
The main ways to dissipate heat from the outer surface of the electronic radiator to the room are radiation and convection. We hope that the radiator can transfer heat to the room in the best way. Practice has proved that the way of heat radiation is the best. Due to the direct effect of radiation, the temperature of indoor objects and the inner surface of the enclosure structure can be increased, so that the temperature of the living and working areas is uniform and suitable. When heat is dissipated by convection, the natural convection speed of air is slow, which will cause excessive temperature difference between upper and lower, uneven room temperature, and convection of dust with air.
When the difference between the average temperature of the heat medium in the radiator and the indoor air temperature is 1℃, the heat dissipation per unit time of the radiator metal with a mass of 1kg is called the metal thermal strength [W/(kg * K)]. Metal thermal strength is an important indicator to measure the amount of metal consumed by the radiator and the cost. The larger the value, the less metal consumed and the lower the cost for the same amount of heat dissipation; the smaller the value, the more metal consumed and the higher the cost. We hope to choose electronic radiators with high value, relatively cheap price, and durability.