Application of Piezoelectric Fan in Pico Projectors and its Thermal Investigation
| Autor: | Ho-Min Tsai, 蔡和旻 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 This study embedding two different shaped piezoelectric fans into the micro projector as cooling devices to investigate the cooling effect of micro projector with various placed orientations, fins, blades material and operating frequency. The micro projector is experimented in a horizontally or vertically oriented and the two piezoelectric fans are placed in two heights, where those are placed 19mm and 26mm. Furthermore, the operating frequency ranges are depending on blades shape and material. The operating frequency ranges of narrow mylar, wide mylar and wide aluminum respectively are from 129.5 Hz to 135.5 Hz, 71.5 Hz to 86.5 Hz and 121.5 Hz to 145.5 Hz. The result showed that when piezoelectric fans are unactuated, vertically oriented cooling effect is better than horizontal placement. Moreover, the thermal resistance of the tested micro projector in vertical placement was descended where it was placed in heights 19 mm and 26 mm, the drop values are between 0.27 ℃/W and 1.61 ℃/W, and 0.15 ℃/W and 1.62 ℃/W respectively. Piezoelectric fans is acutely influenced by heat, especially when the micro projector was in horizontal placement, wherefore the piezoelectric fan amplitude change with different heat source power from 2 W to 7 W will be discussed. The result indicate that narrow mylar piezoelectric fans with array pin fins can achieve the lowest thermal resistant of the tested micro projector, where it is in vertical placement and furthermore the working frequency of piezoelectric fans is at 133.5 Hz. In the above case, the drop values of thermal resistant is from 3.52 ℃/W to 6.34 ℃/W, when heat source power from 2 W to 7 W. At a particular frequency, the maximum range of the thermal resistant shift is from 0.52 ℃/W to 3.92 ℃/W, when piezoelectric fan is affected by heat. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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