Because of the increasing panel size, the difficulty on delivering the glass substrate has been enhanced dramatically and become a critical problem in the LCD manufacturing industry. Nowadays, most of panel fabrication factory utilize the fully-automated delivering technology instead of the traditional labor delivery for diminishing the possibility of polluted particles on the LCD board. Thus, this study investigates the flow patterns on maintaining the air quality inside the delivering facility with a moving elevator. Also, influence on the moving pattern of the elevator via numerical technique is the focus of this investigation. Firstly, CFD code Fluent is used to execute the CFD simulation and evaluate the flow patterns inside this delivery equipment. It is found that the inferior air is generated mainly by the increasing vortex inside the delivery equipment for an upward-moving elevator. On the contrary, the flow field becomes very smooth without obvious vortex phenomenon, and thus induces a better air quality when the elevator moves downward. However, a better uniform flow field occurred when the elevator is moving upward. In addition, the airflow uniformity is not effectively improved by reducing the elevator velocity and increasing the FFU airflow velocity. It is not evident for improving the pollute exclusion by reducing elevator moving velocity which slows down the transporting efficiency, so it is suggested that the moving speed of elevator should maintain at 0.16m/s. On another way, it is useful to enhance the capability of pollute exclusion by increasing the FFU’s air velocity, thus it is proposed to raise FFU velocity to 0.71m/s. Consequently, it is concluded that the moving pattern of elevator has an essential impact and can be utilized to improve the air quality inside the LCD delivery facility.
The daytime running light (DRL) is a special lamp; they can be automatically switched on when the engine is started, and hence substantially increase the visibility of motor vehicles. Comparing to traditional light sources in DRL, LED offers many advantages such as its high lighting efficacy, low power consumption, quick response time, and long lifetime, However, the application of high brightness LED on DRL still faces severe thermal challenge in removing the unavoidable dissipation heat, which directly influences the radiation efficiency, emitted light quality, and lifetime of LED. Therefore, this investigation focuses on the thermal management for LED Daytime Running Lamp through an integrated effort of CFD simulation, CNC mockup fabrication, and experimental verification. At first, a comprehensive CFD simulation is executed to check the heat-removing performance of several thermal modules for identifying the efficient thermal design. Thereafter, this LED module integrated with a Zinc-Al alloy casing is fabricated via the die-casting and carried out the thermal performance measurements for experimentally validating the numerical outcomes. As a result, after taking the contact resistance and radiation into account, the comparison between numerical and experimental results indicates an acceptable deviation percentage within 5%. Also, experimental result shows that the LED junction temperature is located within the range of 50∼51°C for the case of a 2.34-Watt power input and a 35°C environmental temperature. Moreover, for a 10-Watt power input, the numerical calculation predicts that LED junction temperature is 88.6°C, which is still well below the safety limit (120°C). In conclusion, the accomplishment of this research offers a rigorous and systematic design scheme for the thermal management of the LED DRL. This design scheme has successfully produced an efficient thermal module to control the LED chip temperature below safety limit.
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