Abstract
A solid state relay mounted at a cabinet wall dissipating 30 W heat is considered in this analysis. A parallel plate mid-finned heat sink is designed for the relay to accommodate within 100 × 60 × 100 mm3 volume. A heatsink of 100 mm × 56 mm base size, 6 mm trunk thickness, 3 mm fin thickness, 6 mm fin spacing, and 102 mm length is attained by optimization. Further, it is optimized by trimming off the inefficient portion of the fin height, thereby attaining a taper heat sink without compromising the thermal performance. The appraisement of this trimming is characterized by the taper angle formed between the base of the heat sink and the line connecting all fin tips. The temperature profiles for heatsinks with 90°, 85° and 80° taper angle are presented in this paper for various power levels. The heat sink with 85° taper angle is optimum and the same is fabricated and tested experimentally. Thus, the parallel plate heat sink is optimized to improve the overall fin effectiveness and a 13% reduction in weight is achieved at 85° taper angle with a notional increment in temperature.
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