Mathematical modeling and numerical simulation of heat dissipation in led bulbs

Abstract

We present a detailed study of heating and cooling processes in LED luminaires with passive heat sinks. Our analysis is supported by numerical simulations as well as experimental measurements, carried on commercial systems used for outdoor lighting. We have focused our analysis on the common case of a single LED source in thermal contact with an aluminum passive heat sink, obtaining an excellent agreement with experimental measurements and the numerical simulations performed. Our results can be easily expanded, without loss of generality, to similar systems.

Use of Receiver Operating Characteristic Curve to Evaluate a Street Lighting Control System

“…In street lighting, the maximum consumption occurs when all the electrical and electronic elements (sensors, processors, and actuators) are working. Different changes can reduce the maximum consumption: using lower consumption LED lights [19] or decreasing the number of street lights.…”

A Fractional Derivative Modeling of Heating and Cooling of LED Luminaires

“…Unsurprisingly, Figures 1 and 2 show that the maximum of the steady-state temperature distribution coincides with the position of the LED chip. The temperature decreases with the distance to the chip in an almost radially symmetric fashion [14], with a typical benchmark value of between a 1 and 2 • C drop per centimeter. In general, there is an excellent agreement between the experimental measurements performed with a thermal camera and the results of the numerical model.…”

“…Moreover, [10] described a simplified mathematical model and [11] emphasized the role of orientation. In [12][13][14], a low-cost solution consisting of a sink that can be directly attached to the bulb without changing the luminaire itself was put forward. In general, it is clear that, because of the enormous economic impact of public illumination, it is of great importance to have adequate mathematical tools to accurately describe the heating and cooling processes in this type of systems.…”