The heating of electrical equipment is a phenomenon that people often come into contact with in life and work. If the internal temperature of the equipment is not effectively controlled, equipment failure or even circuit short circuit may occur due to excessive temperature. So what is the heating of electrical equipment?
Electrical equipment is a kind of mechanical equipment that converts electrical energy into other energies. During operation, electrical energy will flow through the equipment, but when electrical energy is converted into other energies, complete conversion cannot be achieved, and some energy will be lost, and a large part of this energy will be lost. It is lost in the form of heat, which is one of the reasons why the electrical equipment will heat up when it is running.
Thermally conductive material is one of the materials specially designed to solve the problem of heat dissipation in the field of thermal management. In the past, people would install heat sinks on the surface of power-consuming electronic components, but the heat dissipation effect was very low and the temperature could not be effectively controlled. In the gap, no matter how smooth the surfaces of the two are, there is still a gap at the interface, and there is hot bad conductor air in the gap, so the heat conduction effect is very poor. At this time, it is necessary to fill the gap with a thermally conductive material, so that the two can be in close contact and eliminate the interface. Air to improve heat transfer, thereby improving heat dissipation.
There is a saying in the thermal conductivity material industry: purchasing depends on thermal conductivity, while engineering depends on thermal resistance. It is well known that thermal conductivity is the main point among the many parameters of thermally conductive materials. It is the standard for measuring the thermal conductivity of thermally conductive materials. However, for engineers, they often pay attention to thermal resistance. Does thermal resistance affect thermally conductive materials? The answer is yes.
In professional academic analysis, thermal resistance is the temperature difference formed at both ends of the object when the heat flow passes through the object. The thermal resistance reaction in the thermal conductive material is to guide the ability of the thermal material to hinder heat conduction. The greater the thermal resistance of the thermal conductive material, the stronger the ability to hinder the thermal conduction. The two sides of the surface are the starting point and the ending point. When the heat enters the thermal conductive material through the surface, it begins to conduct to the other side. The thermal resistance is the railing on the track, which hinders the transfer of heat. The greater the thermal resistance, the harder it is for heat to pass. Pass it to the other side, which is also the essence of thermal resistance.
Some people think that the higher the thermal conductivity of a thermally conductive material, the lower the thermal resistance. In fact, this is not true. The thermal resistance does not necessarily depend on the high or low thermal conductivity, but one thing can be said. For a thermally conductive material with the same other parameters except the resistance value, the thermally conductive material with a small thermal resistance value has a better thermal conductivity effect, whereas a thermally conductive material with a large thermal resistance value has a poor thermal conductivity effect.
When people buy or purchase thermally conductive materials, in addition to knowing their thermal conductivity, size and thickness, compressibility, and hardness, thermal resistance should also be paid attention to. After all, it is one of the key factors affecting the thermal conductivity of thermally conductive materials.