查詢結果分析
來源資料
相關文獻
- 機能紙全熱交換器之測試研究
- 機能紙全熱交換器之性能測試實驗
- The Comparison of Trade Secrets Protection between Taiwan and the U.S.
- 以ROTT測試求得製程密封墊片設計參數與數據資料應用
- Leaky Mode Perspective on Printed Antenna
- 國外壓力管道洩漏檢測技術現狀
- Surface-Wave-Leakage-Related Propagation Characteristics of Coplanar Strips with and without a Back Conductor Plane
- 煤氣櫃帶壓粘接補漏技術
- 高鐵用洩漏同軸電纜系統--「在隧道內及其他環境條件下高速火車所用的洩漏同軸電纜系統: 理論與實際經驗」
- 閥製品微量洩漏標準檢測技術
頁籤選單縮合
題名 | 機能紙全熱交換器之測試研究=A Heat and Mass Transfer Analysis of Cross-Flow Air-to-Air Total Heat Exchangers |
---|---|
作者姓名(中文) | 李延青; 彭及青; 黃蒨芸; 鄭名山; | 書刊名 | 力學 |
卷期 | 17:2 2001.12[民90.12] |
頁次 | 頁81-92 |
分類號 | 460.027 |
關鍵詞 | 靜置式全熱交換器; 洩漏; 省能分析; Stationary total heat exchanger; IAQ; Leak analysis; |
語文 | 中文(Chinese) |
中文摘要 | 以機能紙(functional paper)所堆疊而成之全熱交換器(total heat exchanger),其使用目的在於IAQ(indoor air quality)換氣下可達到換氣與降低因換氣所須增加之空調負荷。但其紙基材(subtract)纖維孔隙特性所造成之氣流洩漏使省能分析變得雜,有進一步探討之必要。本文嘗試將原先日本空調協會JRA所規範之全熱交換器性能測試項日 [1] 予以重新組合進行實驗,並定義新的省能指標與佔算機能紙基材的熱質傳遞效益。測試結果顯示,JRA所定義全熱效率會比本文所定義空調負荷省能比高,且隨洩漏率之增加其差異會更明顯,使原本換氣省能意含在洩漏率大的情況下會有嚴重被放大之解讀。機能紙之熱質傳遞是省能之主因,在洩漏率小於12%之前提下,洩漏可使空調負荷省能比例上升,但超過12%後其機能紙熱質傳會呈不穩定之上下波動變化,因此在應用上應使洩漏率控制在12%以內。 |
英文摘要 | A series of high performance total heat exchangers has been developed at ERL/ITRI recently. Operation of these cross-flow type air-to-air heat exchangers is based on thin fibrous paper, permeable to moisture but highly impermeable to air, capable of recovering both sensible and latent heat from air. They show great energy saving potential when fresh air is required for IAQ purposes in a conditioned space. Efficiencies of these exchangers re heavily influenced by air leakage from the return to the supply side, resulting from manufacturing defects and/or the pressure difference between the two sides. Mixing of fresh air with return air renders traditional efficiency definitions of heat exchangers ambiguous. A concept of effective fresh air efficiency defined on the basis of per-unit-effective-fresh-air is proposed and the leakage effect on the efficiency is examined with experiments as well as a theoretical model describing the heat and mass transfer mechanisms within the heat exchangers. The new definition gives the same results as those from the traditional efficiency definition when the leakage rate is small (<2%) but the difference becomes significant as the leakage rate becomes larger. Experimental results also indicate that there might exist a best leakage rate (~12%) in so far as the efficiency is concerned, beyond which the performance of the total heat exchanger is highly unstable due to a possible change of surface boundary layer characteristics on the hydrophilic paper. Below the threshold leakage rate, the total heat exchange efficiency increases with the leakage rate. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。