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A Prediction Of The Temperature Of a Recessed LED Panel Ceiling Light

The recessed ceiling light emitting diodes (LED) lights or downlights are installed in a hole (cavity) in the ceiling of a building. The air surrounding LED circulates due to natural convection and carries heat from the LED light to the concrete. LED lights use electronic chips operated by a controlled direct current that is obtained from converting the alternating current to direct current by an electronic circuit. Thus, the heat is generated and the temperature of LED increases which affects LED performance and life adversely. In this paper, the momentum and energy equations are solved using Ansys FLUENT. The procedure for an axisymmetric analysis has been developed. Two cases - the air inside the cavity and an extended air envelop below the LED light in addition to the air in the cavity have been compared. The interaction between air in the cavity and in the room shows significant advantage and maximum temperature reduces to 403 K as compared to the isolated air in the cavity at 438 K. The study shows that the natural convection currents can influence the heavier air away from the heating zone also resulting in increased heat transfer.