淡江大學機構典藏:Item 987654321/74526
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 62797/95867 (66%)
造访人次 : 3733383      在线人数 : 294
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/74526


    题名: 迴流效應於絲網型太陽能空氣加熱器之研究
    其它题名: Performance improvement of wire-mesh double-pass solar air heaters with external recycle
    作者: 林群勝;Lin, Chun-Sheng
    贡献者: 淡江大學化學工程與材料工程學系碩士班
    何啟東;Ho, Chii-Dong
    关键词: 迴流;集熱器效率;太陽能空氣加熱器;絲網;Recycle;collector efficiency;Solar Air Heaters;Wire-mesh
    日期: 2011
    上传时间: 2011-12-28 18:49:33 (UTC+8)
    摘要: 太陽能空氣加熱器主要用於固體、農作物及海產之乾燥或室內溫度調節等等。研究太陽能空氣加熱器主要目的在提高其熱效率。目前已有許多不同型式之太陽能空氣加熱器被設計且提出;影響太陽能空氣加熱系統之集熱器效率的因素很多,其中不同吸收板型式與空氣加熱器通道之設計均能影響集熱器效率。
    本文針對雙流型平板式、絲網式迴流型太陽能空氣加熱器,於一定的吸收板面積及相同操作條件下;在太陽能空氣加熱器系統,主要探討五個部份:一是迴流對總集熱器效率之影響,二是吸收板形式對效率值的影響,三是質量流率對效率值的影響,四是迴流型式對太陽能空氣加熱器的效率之影響,五是進口溫度對效率的影響。
    研究結果顯示:太陽能空氣加熱器之總集熱器效率隨著迴流比及質量流率增加而增加。此外,在不同收集器中空氣加熱器效率提高百分率之高低依次為: 加絲網式,平板式。又在於不同質量流率下,質量流率越低則空氣加熱器效率提高百分率越高;而且四種迴流中,第三種迴流型式的經濟可行性是最好的。
    An analytical study on the heat-transfer efficiency improvement of downward-type wire-mesh solar air heaters with external recycle has discussed. The purposes of this study were to enlarge the heat transfer area by attaching wire-mesh, to enhance the convective heat transfer coefficient by recycling operations, and to find out the best recycle types based on the heat-transfer efficiency. The thermal performance of recycling downward-type wire-mesh solar air heaters were also compared to that of the single-pass device and the flat-plate double-pass device with recycle.
    The mathematical formulation and analytical analysis to such a recycling wire-mesh double-pass solar air heater were developed theoretically. Two conflict effects are made by the recycle operations: the desirable effect of increasing the convective heat-transfer coefficient by increasing the air mass velocity in conduit, and the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, due to remixing. The heat transfer efficiency can be improved while the desirable effect compensates the undesirable one. Conclusively, the recycling operations and the wire-mesh attached design can readily improve the heat-transfer performance of solar air heaters by comparing to the flat-plate double-pass and single-pass devices. An economic consideration in terms of the heat- transfer efficiency and power consumption increment for double-pass operation is also delineated.
    显示于类别:[化學工程與材料工程學系暨研究所] 學位論文

    文件中的档案:

    档案 大小格式浏览次数
    index.html0KbHTML216检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈