Heat-Transfer in Reflector-type Self-Ballasted Compact Fluorescent Lamps

概要

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Self-ballasted compact fluorescent lamps (SBCFL) are widely used to replace incandescent lamps (IL) to save energy. We studied the heat-transfer phenomena of SBCFLs with outer envelopes by measuring the temperatures of the lamp parts, the power consumption, and the luminous output, and by calculating the energy balance. The methods applied were heat-transfer network analysis and computational fluid dynamics (CFD) using FLUENT software. The heat loss increased in reflector-type SBCFLs as compared to SBCFLs with non-reflective outer envelopes, and was estimated at about 3W when the total lamp power was 22W. This results in a temperature rise of 20K in the plastic holder, and a maximum rise of 10K at the electronic components on the circuit board. Accordingly, we have developed a 12W reflector-type SBCFL, which replaces a 60W incandescent, not a 22W SBCFL replacing a 100W incandescent R-lamp, due to the importance of thermal reliability.