文化大學機構典藏 CCUR:Item 987654321/2699
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 46867/50733 (92%)
造訪人次 : 11889999      線上人數 : 698
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧：
  • 您可在西文檢索詞彙前後加上"雙引號"，以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋，建議至進階搜尋限定作者欄位，可獲得較完整資料
    •  進階搜尋
    主頁 ‧ 登入 ‧ 上傳 ‧ 說明 ‧ 關於CCUR ‧ 管理 到手機版


    請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/2699


    題名: External flow effects on the discharge coefficients of two types of ventilation opening
    作者: Chiu, Y-H.
    Etheridge, D. W.
    貢獻者: 建築系
    關鍵詞: natural ventilation
    日期: 2007
    上傳時間: 2009-11-13 15:49:09 (UTC+8)
    摘要: Envelope flow models are commonly used in the design of naturally ventilated buildings. Such models rely on specification of the discharge coefficient, C-z of ventilation openings, such as air vents and chimneys (stacks). Current practice is to make use of values obtained from laboratory tests under still-air conditions. These values may not be appropriate when the ventilation is due to wind, due to the external flow around the opening which is characterized by unsteadiness of both the velocity and pressure fields. Experimental tests have been carried out in a wind tunnel on two types of openings, namely a sharp-edged orifice (flush to the wall) and a long opening (chimney). Using an analytic result for the still-air case and simple dimensional analysis it is argued that the local crossflow velocity ratio, V/u, is an important parameter for the orifice and the experimental results support this (as do some simple CFD calculations). The experimental results for the sharp-edged opening are similar to earlier work on generally larger openings. For the long opening the effects of external flow are smaller. In particular, the effects are negligible when the outlet of the opening lies in the external flow. Estimates are made of the consequential uncertainties arising in envelope flow calculations for natural ventilation design. (c) 2006 Elsevier Ltd. All rights reserved.
    關聯: JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS Volume: 95 Issue: 4 Pages: 225-252
    discharge coefficient
    wind tunnel modelling
    chimney
    顯示於類別:[建築及都市設計學系所] 期刊論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbText1081檢視/開啟


    在CCUR中所有的資料項目都受到原著作權保護.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋