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A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array

Author

Listed:
  • Jin-Cherng Shyu

    (Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan)

  • Tsuni Chang

    (Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan)

  • Shun-Ching Lee

    (Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan)

Abstract

This study numerically investigates the effects of the number of bottom openings and the fin spacing on both the natural convection heat transfer and airflow field of the handheld projector with various orientations. The horizontally-oriented 120 mm × 53 mm × 19 mm handheld projector, which had 11 bottom openings and was installed with either 7 plate fins or 13 rows of square pin, was considered as the primary case. The fin number varied from 6 plates to 13 plates or from 7 pin rows to 16 pin rows, while the bottom openings varied from 11 to 15 in this study with handheld projector held at a specified inclination ranging from −90° to 90°. The results showed that the heat transfer coefficient of a specific surface of the plate-fin array installed in the primary handheld projector increased from 6 to 7 W/m 2 ·K as the heating power increased from 2 W to 7 W. The optimal fin spacing in the handheld projector possessing 11 bottom openings was 2.875 mm and 3.375 mm for the plate-fin and pin-fin, respectively, at a heating power of 7 W. Although the velocity magnitude of the airflow between fins increased as the bottom opening increased, it was not able to offset the reduction of the airflow velocity resulting from the fin spacing reduction.

Suggested Citation

  • Jin-Cherng Shyu & Tsuni Chang & Shun-Ching Lee, 2017. "A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array," Energies, MDPI, vol. 10(3), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:266-:d:91270
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    References listed on IDEAS

    as
    1. Leung, C.W. & Probert, S.D. & Shilston, M.J., 1985. "Heat exchanger: Optimal separation for vertical rectangular fins protruding from a vertical rectangular base," Applied Energy, Elsevier, vol. 19(2), pages 77-85.
    2. Radziemska, E. & Lewandowski, W. M., 2001. "Heat transfer by natural convection from an isothermal downward-facing round plate in unlimited space," Applied Energy, Elsevier, vol. 68(4), pages 347-366, April.
    3. Jong Bum Lee & Hyun Jung Kim & Dong-Kwon Kim, 2016. "Experimental Study of Natural Convection Cooling of Vertical Cylinders with Inclined Plate Fins," Energies, MDPI, vol. 9(6), pages 1-15, May.
    4. Leung, C.W. & Probert, S.D. & Shilston, M.J., 1985. "Heat exchanger design: Optimal uniform separation between rectangular fins protruding from a vertical rectangular base," Applied Energy, Elsevier, vol. 19(4), pages 287-299.
    5. Lewandowski, Witold M. & Radziemska, Ewa, 2001. "Heat transfer by free convection from an isothermal vertical round plate in unlimited space," Applied Energy, Elsevier, vol. 68(2), pages 187-201, February.
    6. Byung-Lip Ahn & Ji-Woo Park & Seunghwan Yoo & Jonghun Kim & Seung-Bok Leigh & Cheol-Yong Jang, 2015. "Savings in Cooling Energy with a Thermal Management System for LED Lighting in Office Buildings," Energies, MDPI, vol. 8(7), pages 1-14, June.
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    Cited by:

    1. Shahzada Zaman Shuja & Bekir Sami Yilbas & Hussain Al-Qahtani, 2020. "Influence of Hydrophobic Fin Configuration in Thermal System in Relation to Electronic Device Cooling Applications," Energies, MDPI, vol. 13(7), pages 1-19, April.

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