Temperature Regulation for LED Lamps Using Fans

2013 ◽  
Vol 753-755 ◽  
pp. 1931-1938
Author(s):  
Hyeung Sik Choi ◽  
Hee Young Shin ◽  
Ji Youn Oh ◽  
Tae Woo Lim ◽  
Yun Hae Kim
Keyword(s):  
Temperature Control ◽  
Temperature Regulation ◽  
Light Emitting Diode ◽  
Operation Time ◽  
Heat Sinks ◽  
Optimal Size ◽  
Light Emitting ◽  
Regulation Scheme ◽  
Cooling Fan ◽  
Relationship Of

A temperature regulation control for LED(Light Emitting Diode) lamp using a cooling fan was studied. An efficient temperature regulation scheme using fan wind at the lowest sound noise was studied. For the study, after measurement of the minimum sound noise of the fan and related temperature of the LED lamp through tests, experiments on temperature control of the LED lamp using the fan with various size of heat sinks was performed. Also, characteristics and relationship of heat sinks and fans are studied through experiments. To reduce the fan sound noise, a method of reducing the operation time with optimal size of the heat sink was studied.

Low Cost Cooling Device for High Power LED Lamps

2020 ◽  
Author(s):  
Pamela Martinez-Vega ◽  
Araceli Lopez-Badillo ◽  
J. Luis Luviano-Ortiz ◽  
Abel Hernandez-Guerrero ◽  
Jaime G. Cervantes
Keyword(s):  
Reference Model ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Cost Effective ◽  
Heat Sinks ◽  
Modern World ◽  
Type Model ◽  
Light Emitting

Abstract The modern world progressively demands more energy; according to forecasts energy consumption will grow at an average annual rate of 3 percent. Therefore, it is necessary to purchase products or devices that are efficient and environmentally friendly. Technology in LED (Light Emitting Diode) lighting is presented as an alternative to energy saving, since LEDs have proven to be extremely efficient, have a long service life and their cost-effective ratio is very good. However, the heat emitted by the LED chip must be dissipated effectively, since the overheating of the chip reduces the efficiency and lifetime of the lamp. Therefore, heat sinks that are reliable, efficient and inexpensive should be designed and built. The present work proposes new designs for heat sinks in LED lamps, some of the models in the design of the fins refer to the Fibonacci series. The models proposed in the present work that have a significant advantage are the Type 1E Model (5.2% mass savings and better thermal efficiency of 8.33%), GR Type 1 Model (3.12% lighter and 3.33% more efficient) and the GRL Type Model (4. 51% mass savings and 5.55% thermally more efficient) compared to the Type 2 Reference Model proposed by Jang et al. [12].

scholarly journals Usage of Light-Emitting Diode Lighting and Visible Light Communication Technology for Temperature Control

2021 ◽  
Vol 18 (4) ◽  
pp. 7-24
Author(s):  
Svetlana Grigoryeva ◽  
Alexander Baklanov ◽  
Aslima Alimkhanova ◽  
Alexander Dmitriev ◽  
György Györök
Keyword(s):  
Visible Light ◽  
Communication Technology ◽  
Temperature Control ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Light Emitting

Efficient perovskite light-emitting diodes by film annealing temperature control

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 71070-71075 ◽  
Author(s):  
Junqing Liang ◽  
Yongqiang Zhang ◽  
Xiaoyang Guo ◽  
Zhihong Gan ◽  
Jie Lin ◽  
...  
Keyword(s):  
Temperature Control ◽  
Annealing Temperature ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Film Annealing

A bright perovskite light-emitting diode has been fabricated through film annealing temperature control.

Thermal Analyses of LED Light Bars and Backlight Modules

2016 ◽  
Vol 33 (3) ◽  
pp. 331-339 ◽  
Author(s):  
M.-Y. Tsai ◽  
C.-Y. Tang ◽  
C.-E. Zheng ◽  
Y.-Y. Tsai ◽  
C.-H. Chen
Keyword(s):  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Thermal Analyses ◽  
Heat Sinks ◽  
Junction Temperature ◽  
Thermal Interface Materials ◽  
Light Emitting ◽  
Led Light ◽  
The One ◽  
Interface Materials

AbstractThe effects of various parameters, such as thermal properties of substrates, thermal interface materials (TIMs) and heat sinks on the thermal performance of the light emitting diode (LED) light bars and backlight module are investigated experimentally and numerically in terms of junction temperature (Tj) and thermal resistances from junction to air (Rj-a). The results show that the measured Rj-a of the light bars by powering-on five LEDs in the test is different from one by powering-on only one LED, resulting from the extra heat coming from the adjacent LED packages affecting the Tj for the case of powering-on five LEDs. For the modules, Rj-a is significantly reduced by using the heat sinks for all backlight modules, and aluminum and iron heat sinks do not show any obvious difference in heat dissipation along with any substrates and TIMs. Furthermore, both experimental and simulation results show that the thermal conductivity of the substrates are more important and dominant than TIM and heat sink for the Rj-a of the backlight modules concerned, and also demonstrate that the thermal field for the local model can represent the one in full-scale backlight module.

scholarly journals Modelling and Numerical Simulations of Heat Distribution for LED Heat Sink

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jianxin Zhu ◽  
Lixia Sun
Keyword(s):  
Heat Sink ◽  
Optimization Design ◽  
Evaluation Method ◽  
Light Emitting Diode ◽  
Vertical Direction ◽  
Heat Sinks ◽  
Heat Distribution ◽  
Spherical Coordinate ◽  
Light Emitting ◽  
Implicit Finite Difference

Light-emitting diode (LED) has higher efficiency and longer lifetime when compared with the conventional lighting. However, the efficiency and lifetime will be degraded greatly when it is operated at a high temperature. Now, both previous simulation and experimental results have already indicated that the heat transfer in vertical direction of the LED lamp by conduction is the most critical component. In this paper, a simplified numerical simulation model is built to estimate the heat distribution of the LED heat sink in the spherical coordinate system, which would be useful for its shape optimization design. With this model, some mathematical treatments are provided to a heat conduction equation, in order to rapidly compute the static heat distribution and the temperature of different designs of LED heat sinks. The built rapid heat sink evaluation method, implicit finite difference method (IFDM), is unconditionally stable. Several heat distribution simulations could demonstrate that our built mathematical model conforms well to the reality and our method is full of feasibility and effectiveness.

scholarly journals A Novel Heat Sink Design and Prototyping for LED Desk Lamps

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Li-Ming Chu ◽  
Wei-Chin Chang ◽  
Ting Hsuan Huang
Keyword(s):  
Heat Sink ◽  
Light Emitting Diode ◽  
Base Plate ◽  
Life Time ◽  
Heat Sinks ◽  
Light Emitting ◽  
Lighting Device ◽  
Different Types ◽  
Heat Sink Design ◽  
Chimney Effect

Light-emitting diode (LED) is a modern lighting device. If the heat dissipating mechanism of LED desk lamp is not well designed, the induced high temperature will cause the reduction of illumination and life time of lamp. Therefore, the heat sink design becomes a key technology for LED lighting device. This study developed a methodology to design and analyze a heat sink for LED cooling. Four different types of heat sinks with fins in longitudinal or transverse directions and with or without vents on the base plate were compared. By using the CFD software FLUENT, heat flux and temperature around the heat sink were analyzed, and the surface temperature distribution was also investigated. The simulation outcomes were compared with experiments results to verify analysis accuracy. The comparisons show only slight differences, and the deviations were less than 4.0%. For cooling LED desk lamp, the design of using 12 vents on both sides of heat sink through natural convection to create the chimney effect was adopted; consequently, the temperature dropped 5°C in average. This design can also reduce the material of heat sink, LED lamp weight, and production cost.

Improved Radial Plane Fins Heat Sink for Light-Emitting Diode Lamps Cooling

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
António M. G. Lopes ◽  
Vítor A. F. Costa
Keyword(s):  
Heat Sink ◽  
Numerical Study ◽  
Light Emitting Diode ◽  
Heat Sinks ◽  
Electronic Components ◽  
Turning Operation ◽  
Light Emitting ◽  
Radial Plane ◽  
Convection Cooling ◽  
Main Ideas

Abstract A numerical study is conducted concerning the improvement of radial plane fins heat sinks for natural convection cooling of light-emitting diode (LED) lamps. The main objective is to maintain the temperature of the heat sink base below a prescribed threshold for a given released heat flux at the heat sink, minimizing its mass and maintaining at a reasonably simple level the manufacturing processes and operations required for its production. Starting from a previously optimized heat sink for the same purpose, constituted by complete rectangular radial plane fins, the present study aims at further improvements by considering incomplete rectangular radial plane fins. The main objective of this study is to find the best profile for the turning operation to obtain the radial plane fins lighter configuration. It is found that this can be achieved by removing part of the upper internal corners of the rectangular fins, more specifically shaping a curved cut, leading to heat sink mass reduction up to 32.4%. The geometry of the improved heat sink is of cylindrical nature, obtained from cutting an aluminum extruded bar comprising a cylindrical central core and a number of uniformly distributed rectangular radial plane fins, followed by a simple turning operation to remove their upper internal corners. Even if results concern a particular LED lamp, the main ideas and approach prevail to improve other types of heat sinks for general light and/or electronic components cooling.

scholarly journals TANDA DINAMIS SEDAAP DAN DIMENSI BUDAYA MEDIA LED DALAM RESPON BERSISI DUA REMAJA

2018 ◽  
Vol 7 (2) ◽  
pp. 154
Author(s):  
Vera Yulia Harmayanthi
Keyword(s):  
Light Emitting Diode ◽  
Cultural Dimension ◽  
Persuasive Messages ◽  
Advance Technology ◽  
Light Emitting ◽  
The Media ◽  
Relationship Of ◽  
The Relationship ◽  
Two Sides ◽  
Age And Sex

The media today is characterized scene and space evolution of advertising. LED Media (Light-Emitting Diode as advertising displays) is one of popular outdoor media spaces to advertise kinds of products’ scenes, such as: drink and foods. Cultural dimension of LED media is attractive conventional media with advance technology and creative works. There are the creations of words which included visual pictures in moving appearance are applied and appropriated into LED media landscape. Its deliver the persuasive messages to individuals. Messages are pointed and adapted to individuals in age levels as the target. That is the most important to know their responses on those messages to be effectiveness. Perspective semiotics, Peirce theory, was used in this qualitative study as the way to know the level of individuals’ responses to products’ messages on LED media’s cultural dimension. The data were collected from teenagers who have experiences to the product. It is included external indicators like as age and sex in two-sided responses to some dynamical signs. They are both words and visual pictures offering a product messages <em>Mie Sedaap</em> on LED media, January 2017 at South Jakarta area. The results show, 1) dynamical signs of <em>Sedaap </em>in the relationship between representamen, object, and interpretant; 2) the relationship of dynamical signs <em>Sedaap</em> to cultural dimension on LED media; and 3) The levels of teenagers’ responses in two-sides <em>like and dislike</em> until their decisions to buy products. All of them give values to show the effectiveness messages of cultural dimension on LED media, especially for teenagers.

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