Simulation and evaluation of the peak temperature in LED light bulb heatsink

Sun, Lixia; Zhu, Jianxin; Wong, Hei

doi:10.1016/j.microrel.2015.12.023

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…In addition to used power, the design of lighting system can also take into consideration the factors of heating (the quantity of heat produced through lighting), since it can have a significant influence on energy needs for cooling during the summer period [33]. With the recent increment of market penetration of light-emitting diode (LED) lightning technology, one of the interesting measures for increasing the efficiency of lighting systems in public buildings is the replacement of the existent systems with LED technology.…”

Section: Introductionmentioning

confidence: 99%

A method to estimate savings of led lighting instalation in public buildings: The case study of secondary schools in Serbia

et al. 2017

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This paper examines the potentials of saving electric energy in school lighting by replacing the existent systems of lighting with more adequate ones which are based on light-emitting diode technology. Our primary goal is to present the methodology used in this analysis since it can be used to determine potential savings in lighting systems of any public building. We have performed the detailed analysis of nine high schools located in Kragujevac, Serbia. The first step was to collect the data about the numbers and types of systems utilized, as well as about the habits of their users. This has revealed the share of electricity consumption for lighting in total electricity consumption. The replacements for each existent light source have been proposed taking into consideration the projected value of light flux depending on the purpose of each room. The calculations of potential savings through the replacement of lighting systems have been conducted taking into consideration not only the savings in electric energy but also the savings made through the maintenance cost reduction. Based on the results, the potential savings range from 53-62% while the payback period for the analysed schools is about four years in average.

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Section: Introductionmentioning

confidence: 99%

A method to estimate savings of led lighting instalation in public buildings: The case study of secondary schools in Serbia

et al. 2017

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“…All electronic devices and circuits generate excess heat and require greater attention to avoid premature failures. LEDs convert 45% of the energy applied to light and the remaining 55% into heat, which must be dissipated using a design and suitable materials so that the durability and properties of the LEDs are not affected by the increase in temperature [ 17 ].…”

Section: Discussionmentioning

confidence: 99%

“…The LEDs disperse 45% of the energy applied in light and the remaining 55% in heat. High-power chips increasingly emit more heat, which leads to performance degradation [ 17 ] and, ultimately, results in a shorter life expectancy of LED products. Therefore, the industry is investigating product design structures to control the heat generated by high power LED chips [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Thermal Dissipation on the Lighting Performance and Useful Life of LED Luminaires Applied to Urban Lighting: A Case Study

Unión-Sánchez

Hermoso-Orzáez

Hervás-Pulido

et al. 2022

IJERPH

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Currently, LED technology is an established form of lighting in our cities and homes. Its lighting performance, durability, energy efficiency and light, together with the economic savings that its use implies, are displacing other classic forms of lighting. However, some problems associated with the durability of the equipment related to the problems of thermal dissipation and high temperature have begun to be detected, which end up affecting their luminous intensity and the useful life. There are many studies that show a direct relationship between the low quality of LED lighting and the aging of the equipment or its overheating, observing the depreciation of the intensity of the light and the visual chromaticity performance that can affect the health of users by altering circadian rhythms. On the other hand, the shortened useful life of the luminaires due to thermal stress has a direct impact on the LCA (Life Cycle Analysis) and its environmental impact, which indirectly affects human health. The purpose of this article is to compare the results previously obtained, at different contour temperatures, by theoretical thermal simulation of the 3D model of LED street lighting luminaires through the ANSYS Fluent simulation software. Contrasting these results with the practical results obtained with a thermal imaging camera, the study shows how the phenomenon of thermal dissipation plays a fundamental role in the lighting performance of LED technology. The parameter studied in this work is junction temperature (Tj), and how it can be used to predict the luminous properties in the design phase of luminaires in order to increase their useful life.

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“…Mathematical models to analyze thermal characteristics of heat sinks are developed by various scholars in recent years, such as Sun [4], who established a model to predict the peak temperature of a LED bulb by analyzing the performance of its heat sink with effective heat conductivity, and according to simulations and experimental results in [4], Sun [5] extended the simplified mathematical model to estimate the heat flow of a LED bulb in the spherical coordinate system further and verified the validity of the model by numerical simulation with the explicit finite-difference method (EFDM), considering the actual working conditions. Jang et al [6] developed a correlation model to predict the Nusselt number, which was validated experimentally, thus evaluating the influence of orientation effect on the heat dissipation capacity of an inclined cylindrical heat sink.…”

Section: Introductionmentioning

confidence: 99%

Graph Theory-Based Mathematical Calculation Modeling for Temperature Distribution of LED Lights’ Convective Cooled Heat Sinks under Moisture Environment

Lyu

Chen

2020

Mathematical Problems in Engineering

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In this paper, a mathematical model based on graph theory is proposed to calculate the heat distribution of LED lights’ convective cooled heat sink. First, the heat and mass transfer process of a single fin under moisture environment is analyzed. Then, the heat transfer process is characterized by a digraph, defining fins and joints of a heat sink as edges and vertices in graph theory. Finally, the whole heat transfer process is described by two criteria achieved based on graph theory. Therefore, the temperature-heat calculation equations of the whole heat sink are deduced. The accuracy of this model is verified by testing the junction temperature of different LED chips mounted on the same heat sink under moisture environment, and the relative errors between the calculated value and the experimental data are all within 5%, and it is also concluded from the model that heat sinks with an identical heat digraph but different types have close cooling performance and are verified by two typical heat sinks, cylindrical heat sink and rectangular plate-fin heat sink, under the same conditions. The mathematical model based on group theory developed in this paper combined with computer technology is convenient for the performance analysis among a large number of heat sink fin arrangement schemes.

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Simulation and evaluation of the peak temperature in LED light bulb heatsink

Cited by 15 publications

References 17 publications

A method to estimate savings of led lighting instalation in public buildings: The case study of secondary schools in Serbia

A method to estimate savings of led lighting instalation in public buildings: The case study of secondary schools in Serbia

Impact of Thermal Dissipation on the Lighting Performance and Useful Life of LED Luminaires Applied to Urban Lighting: A Case Study

Graph Theory-Based Mathematical Calculation Modeling for Temperature Distribution of LED Lights’ Convective Cooled Heat Sinks under Moisture Environment

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