Temperature Predictions for Automotive Headlamps Using a Coupled Specular Radiation and Natural Convection Model

Moore, W. I.; Powers, Christopher R.

doi:10.4271/1999-01-0698

Cited by 12 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These problems have not been studied deeply enough in the case of headlamps, but there is various research where windshield fogging has been studied [6,7]. There have also been studies solving the combination of natural convection and radiation inside car headlamps [8]. The study done in [9] dealt with the same complexities of the problem, but only simulated a simple box that stood in for the headlamp.…”

Section: Problem Descriptionmentioning

confidence: 99%

CFD Simulation of Defogging Effectivity in Automotive Headlamp

Guzej

Zachar

2019

Energies

View full text Add to dashboard Cite

In the past decade, the condensation of internal air humidity in automotive headlamps has become more prevalent than ever due to the increased usage of a new light source—LEDs. LEDs emit far less heat than previously-used halogen lamps, which makes them far more susceptible to fogging. This fogging occurs when the internal parts of the headlamp fall to a temperature below the dew point. The front glass is most vulnerable to condensation due to its direct exposure to ambient conditions. Headlamp fogging leads to a decrease in performance and the possibility of malfunctions, which has an impact not only on the functional aspect of the product’s use but also on traffic safety. There are currently several technical solutions available which can determine the effectivity of ventilation systems applied for headlamp defogging. Another approach to this problem may be to use a numerical simulation. This paper proposes a CFD (computational fluid dynamics) simulation with a slightly simplified 3D model of an actual headlamp, which allows simulation of all the phenomena closely connected with fluid flow and phase change. The results were validated by real experiments on a special fogging–defogging test rig. This paper compares three different simulations and their compliance with real experiments.

show abstract

Section: Problem Descriptionmentioning

confidence: 99%