Optimization of convectively cooled heat sinks

Lampio, Kaj; Karvinen, R.

doi:10.1016/j.microrel.2017.06.011

Cited by 22 publications

(9 citation statements)

References 7 publications

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“…The Reynolds number is a dimensionless parameter that is used to calculate the ratio of inertial forces versus viscous forces and describes the air flow type such as laminar, transition or turbulent. The Reynolds number can be calculated from the following Equation 10 [18]. =…”

Section: Identification Of Thermocouple Position On the Heat Sinkmentioning

confidence: 99%

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Kumar

Arunachalam

2020

Journal of Thermal Engineering

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Halogen bulbs are sources of light of headlamps of most of the vehicles running around the world. To get better night vision, vehicle owners want to replace the conventional halogen bulbs with HPLEDs without replacing the conventional headlamp assembly. Though High Power Light Emitting Diodes (HPLED) are efficient sources of light for replacing halogen bulbs, conventional headlamps are not designed for HPLEDs and so replaced HPLEDs will fail within a short duration due to poor cooling. The aim of this work is to develop a compact cooling system for a conventional headlamp assembly to accommodate HPLEDs. An air cooled system with a compact heat sink is proposed in this work. To decide the dimensions of the compact heat sink various heatsink sizes were modeled and simulated in ANSYS. For this study, a popular SUV's headlamp is chosen and complete tests were carried out in absence of external lights on a flat black surface for about 28 meters. The light intensity is measured in terms of lux for Halogen and HPLED's horizontal passing beam at various test points. For generating the same intensity of light, it was found from the experimental results that the HPLED consumes only one third of the energy supplied to halogen bulbs. With the proposed cooling system the junction temperature was reduced by about 25% when the cooling fan is operated at laminar flow conditions. On the other hand, the luminous intensity of the HPLED improved by about 30.9% due to the decrease in junction temperature. The HPLED headlamp reflector inner wall temperature is found to be 49 % lesser than Halogen bulb headlamp reflector inner wall temperature.

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Section: Identification Of Thermocouple Position On the Heat Sinkmentioning

confidence: 99%

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Kumar

Arunachalam

2020

Journal of Thermal Engineering

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“…Joo et al (2017) studied the topology optimization of heat sinks in natural convection considering the effect of shape dependent heat transfer coefficient. Lampio and Karvinen (2017) studied the optimization of convectively cooled heat sinks. Saglietti et al (2017) studied the adjoint optimization of natural convection problems in a differentially heated cavity.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

A Systematic Approach for Optimal Positioning of Heated Side Walls in a Side Vented Open Cavity Under Natural Convection and Surface Radiation

Gupta¹,

Prasad²,

Singh³

2018

Frontiers in Heat and Mass Transfer

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A systematic approach for the optimal positioning of multiple isothermal heat sources mounted on the walls of a side vented open cavity filled with natural air (Pr = 0.70) under natural convection and surface radiation is discussed. A numerical investigation is performed for the different possible cases with the two isothermal heat sources of equal dimensions mounted on the walls of the cavity. The geometrical parameters like the aspect ratio (A = 2), side vent ratio (W1 = 0.50) and side port ratio (W2 = 0.50) along with the most pertinent parameters like Rayleigh Number (10 4 ≤ Ra ≤ 10 7 ) and the surface emissivity of walls (0.05 ≤ ε ≤ 0.85) are the prime governing parameters in the different cases.

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“…Lv and Liu maximized the capacity of a heat sink to dissipate heat by using a topology optimization method in [13]. By using the particle swarm optimization (PSO) algorithm, Lampio and Karvinen [14] optimized cooled heat sinks. Bar-Cohen [15] studied the total coefficient to measure the cooling capacity of heat sinks and optimized their performance by the least-energy method.…”

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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Optimization of convectively cooled heat sinks

Cited by 22 publications

References 7 publications

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

A Systematic Approach for Optimal Positioning of Heated Side Walls in a Side Vented Open Cavity Under Natural Convection and Surface Radiation

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

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