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題名 | 輻射形擴散器溫度分層儲冰水系統之性能研究=Performance Study of Stratified Chilled Water Storage with Radial Diffuser |
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作者姓名(中文) | 柯明村; 蕭開元; | 書刊名 | 力學 |
卷期 | 17:1 2001.06[民90.06] |
頁次 | 頁63-70 |
分類號 | 440.137 |
關鍵詞 | 溫度分層; 儲冰水系統; 熱傾區; Stratified; Chilled water storage; Thermocline; |
語文 | 中文(Chinese) |
中文摘要 | 本文針對輻射形擴散器溫度分層儲冰水系統進行數值與實驗分析。為了驗證本研究建立之數值模式的可行性,採用實驗方式來作比對,結果兩者十分相符,證明本研究建立數值模式相當符合實際物理現象,因此,可更進一步利用本理論模式進行參數化之分析。藉由改變儲冰水槽入口的流速與混合區大小之方式,來探討流速和混合區大小對於熱傾區(thermocline)和儲冷╱釋冷效率之影響。由分析結果顯示,雷諾數之大小是影響性能之主要參數。當改變混合區的大小時,首先改變擴散器和槽底之間距離,對冰水儲能效率之影響程度甚小;其次再改變擴散器面積,於高流速下,擴散器面積較大者,可有效地限制溫度混合情況,但面積過大時,將造成擴散器和槽體四週之間隙截面積變小,通過此截面積的流速過大,使得儲冷效能降低。 |
英文摘要 | Stratified chilled water storage is investigated theoretically and experimentally in present study. A numerical model was developed and solved by commercial CFD code. Also a prototype of stratified chilled water tank of 2m high was constructed and experimented to verify the numerical model. The numerical results show good agreement with the experimental data under the same operating conditions. Therefore, this numerical model could be adapted to perform the parametric study on the performance of stratified chilled water storage. The main parameters affect the charging and discharging efficiency and thermocline thickness are found to be flowrate and mixing region. These two factors can be related to inlet Reynolds number (Rei) and Froude number (Fri). The numerical simulations were therefore performed under different possible Rei and Fri. It is concluded that Rei has stronger effect on the system performance than Fri. The diffuser has an optimum area to achieve good thermal stratification as well as prevent thermal mixing due to high velocity flow across the passage between diffuser and tank wall. The optimum design of a stratified chilled water storage tank can be obtained using present numerical model. |
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