低溫自動化倉儲系統之實驗量測與電腦模擬研究

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姓名

陳彥宏(Yan-Hong Cheng ) 查詢紙本館藏

畢業系所

機械工程研究所

論文名稱

低溫自動化倉儲系統之實驗量測與電腦模擬研究

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摘要(中)

台灣地處亞熱帶常年天候燠熱，容易降低農畜漁產食品的新鮮度，
因此不論原料或成品在製造、倉儲、運輸、銷售、消費均需保持在低溫
狀態下以維持生鮮度。而冷凍食品的品質優劣與冷凍倉儲內的氣流場及
溫度場有著密不可分的關係，因此如何描述和預測冷凍倉儲內的流場便
顯得相當重要。
本研究以實驗量測與電腦模擬兩種方法來探討大型冷凍倉儲（其倉儲大小為21m×2.45m×5.0m ）的流場特性，研究中由於本實驗倉儲較大，故在量測上將其分為三個截面來量測，實驗使用熱敏電阻式風速（Thermistor-based anemometer ）及熱電偶溫度計（Thermocouple ）來量測倉儲中的氣流風速與倉儲內溫度變化。結果發現大型冷凍倉儲風管系統出風口之高風速與高紊流現象，進而提升庫內氣流混合效應，達到較
佳之均溫性。再以PHOENICS 軟體建立倉儲內氣流模式，詳細探討冷凍倉儲內的氣流變化，其中針對倉儲內不同的貨物擺設位置，貨物的擺設大致分為空庫、一層貨物、兩層貨物、滿庫等不同情形來分析當貨物擺設位置不同時，其氣流場的分佈情形。數值模擬的結果顯示在大致上的流場趨勢是符合的。目前的研究結果對冷凍倉儲內氣流動態的了解上有很大的意義，更期望此一研究（低溫倉儲庫內的溫度場與流場的了解），能作為往後在低溫倉儲領域設計與使用上的參考。

關鍵字(中)

★ PHOENICS
★ 數值模擬
★ 流場分析
★ 風管系統

關鍵字(英)

★ cold store
★ PHOENICS
★ Simulation

論文目次

目錄
頁次
摘要----------------------------------------------------------i
目錄--------------------------------------------------------- ii
表目錄------------------------------------------------------- v
圖目錄------------------------------------------------------- vi
符號說明--------------------------------------------------------- xiii
第一章前言--------------------------------------------------- 1
1.1 研究動機------------------------------------------------- 1
1.2 研究目的------------------------------------------------- 2
第二章文獻回顧----------------------------------------------- 4
2.1 流場與溫度量測------------------------------------------- 4
2.2 CFD 電腦模擬--------------------------------------------- 7
第三章理論分析---------------------------------------------- 18
3.1 紊流流場--------------------------- ------------------- 18
3.2 紊流k-e 模式-------------------- ----------------------- 18
3.3 CFD 數值方法-------------------------------------------- 20
3.3.1 對流項與擴散項的差分－混合差分法---------------------- 21
3.3.2 SIMPLE 法則------------------------------------------- 22
3.4 模擬軟體------------------------------------------------ 23
3.4.1 PHOENICS 介紹----------------------------------------- 23
3.4.2 數值模擬之流場模型描述---------------------------------25
3.4.3 邊界條件之設立---------------------------------------- 25
第四章實驗方法法-------------------------------------------- 31
4.1 簡介---------------------------------------------------- 31
4.2 實驗量測設備-------------------------------------------- 33
4.2.1 熱電偶溫度計------------------------------------------ 33
4.2.2 熱敏電阻式風速計-------------------------------------- 33
4.2.3 資料擷取系統------------------------------------------ 34
4.3 實驗過程------------------------------------------------ 35
4.4 實驗步驟------------------------------------------------ 37
第五章結果與討論-------------------------------------------- 58
5.1 流場量測實驗結果---------------------------------------- 58
5.1.1 空庫量測（圖4.11 ）----------------------------------- 59
5.1.2 一層貨物堆疊量測（圖4.11 ）--------------------------- 60
5.1.3 一層貨物堆疊量測（圖4.12 ）--------------------------- 61
5.1.4 一層貨物堆疊量測（圖4.13 ）--------------------------- 61
5.1.5 二層貨物堆疊量測（圖4.14 ）--------------------------- 62
5.1.6 二層貨物堆疊量測（圖4.15 ）--------------------------- 62
5.1.7 滿庫情形（圖4.16 ）----------------------------------- 63
5.2 溫度分布結果-------------------------------------------- 64
5.3 模擬與實驗結果比較-------------------------------------- 65
第六章結論與建議------------------------------------------- 100
參考文獻--------------------------------------------------- 101

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指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2001-7-18

推文