Efficiency and Heat Dissipation of Professional Dimming System


Even with a very efficient dimming system, the performance and design of the cooling system is still very important. Even at 98% efficiency, for example, the power consumption itself is still as high as 7.2kW. In order to effectively discharge such a large power consumption out of the system and keep the internal components of the system working in a reasonable temperature environment, the reasonable design of the heat dissipation system cannot be ignored.

At present, there are three popular vertical cabinet heat dissipation systems in the world: forced air supply, forced exhaust and intelligent exhaust.
(1) Forced Air Supply
This heat dissipation system is to install the air supply fan at the bottom of the vertical cabinet, so that fresh air enters from the bottom of the vertical cabinet and blows up at an accelerated rate, thus taking away the heat generated by the SCR.
The advantage of this approach is high efficiency, with a small fan can take a lot of tropical away. Its disadvantage is that the cold air drawn from below is continuously heated by the power consumption of the thyristor on the way up, so the temperature of the thyristor at the top is much higher than that at the bottom, thus causing the reliability and life of the thyristor at the top to decrease.
(2) forced exhaust
This system is designed to install the exhaust fan on the top of the vertical cabinet. Through proper process design, fresh air enters from the front of each SCR, and then the hot air is exhausted to the outside of the vertical cabinet through exhaust.
This method through precision design (fluid dynamics) and rigorous process control, can be done from the top to the bottom of each SCR air intake are roughly the same, so that each SCR are in an acceptable temperature range of operation, to ensure the reliability of each SCR. However, this design also has disadvantages, that is, the wind resistance is large, and the power of the exhaust fan needs to be increased, so the noise is also large.
(3) Intelligent exhaust
Because the dimming system is rarely fully loaded under normal operation conditions, the required exhaust air volume can be relatively reduced. Intelligent exhaust is based on this theory, by detecting the temperature rise in the vertical cabinet, and then determine the amount of exhaust air, in the general operating environment, the fan only needs to run at low speed, the noise is relatively reduced, but when the load increases, the fan will accelerate accordingly. In this way, the advantages of forced ventilation are retained, and the disadvantages of high noise are solved at the same time.
Finally, it is worth mentioning that although there is a high dimming efficiency and a good heat dissipation system, the dimming system is always a very powerful electrical system. High temperature and arcing and other phenomena can not be completely avoided. Only on the basis of high efficiency and good heat dissipation, supplemented by the necessary high temperature and fire prevention measures (such as the use of high temperature flame retardant line), can ensure the safe use of the entire dimming system.

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