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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/9812


    Title: The inaccuracy of heat transfer characteristics of insulated and non-insulated circular duct while neglecting the influence of heat radiation
    Authors: 黃景良
    Tsung-Lieh Hsien
    King-Leung Wong
    Shiue-Jie Yu
    Contributor: 機械工程系
    Keywords: Insulation
    Non-insulation
    Circular duct
    Heat radiation
    Heat convection
    Emissivity
    Date: 2010-01-07
    Issue Date: 2010-04-22 17:04:36 (UTC+8)
    Abstract: The non-insulated and insulated ducts are commonly applied in the industries and various buildings,
    because the heat radiation equation contains the 4th order exponential of temperature which is very
    complicate in calculations. Most heat transfer experts recognized from their own experiences that the
    heat radiation effect can be ignored due to the small temperature difference between insulated and
    non-insulated surface and surroundings. This paper studies in detail to check the inaccuracies of heat
    transfer characteristics non-insulated and insulated duct by comparing the results between considering
    and neglecting heat radiation effect. It is found that neglecting the heat radiation effect is likely to produce
    large errors of non-insulated and thin-insulated ducts in situations of ambient air with low external
    convection heat coefficients and larger surface emissivity, especially while the ambient air temperature is
    different from that of surroundings and greater internal fluid convection coefficients. It is also found in
    this paper that using greater duct surface emissivity can greatly improve the heat exchanger effect and
    using smaller insulated surface emissivity can obtain better insulation.
    Relation: Energy Conversion and Management 50 (2009) 2856–2863
    Appears in Collections:[機械工程系所] 期刊論文

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