摘要
本研究建立內溶冰型圓型槽體水平盤繞式「儲冰槽擬穩態模擬程式」，並以此作為分析工具，探討儲冰槽溶冰熱傳與「儲冰槽溶冰熱交換有效性(ε)」關係、「溶冰盤管總熱傳係數(UAC)」之組成參數分析、儲冰槽參數的變化，其中包含「儲冰槽滷水流量(Vb)」、「儲冰槽盤管層數(N)」、「盤管材料熱傳導係數(Km)」對儲冰槽溶冰熱傳性能影響。 本研究進一步藉模擬工具分析目前常用儲冰槽規範瑕疵，並提出以「儲冰槽溶冰熱交換有效性(ε)」概念制定一新的儲冰槽規範；此儲冰槽規範最大優點為改善了以往儲冰系統測試可行性問題；另以此規範檢驗總負荷相同之「負荷固定」、「負荷遞增」、「負荷遞減」3種類型負荷，模擬結果顯示儲冰槽槽體需分別加大1.18倍、1.32倍和不需加大；本研究希望藉由對儲冰槽熱傳性能之分析，及改善目前儲冰系統規範之盲點，期能使相關領域人員更加了解儲冰槽特性，以利於儲冰系統推廣使用。
並列摘要
The study builds a numerical model of a round- type horizontal- twined total-freeze-up Ice Storage Tank (IST). This model tool can be use to analysis the relationship of the IST‘s discharge heat transfer characteristic and heat exchange effectiveness (ε), the combined parameter of total discharge heat coefficient (UAC), the discharge heat transfer characteristic effective of changing IST‘s parameters which include IST‘s brine flow rate (Vb), total number of coils inside the tank (N) and thermal conductivity of coil‘s material (Km). The numerical model can be further analysis of the imperfect of present IST‘s standard and proposing a conception of using the discharge heat exchange effectiveness (ε) to build a new IST‘s approach. The major contribution of this IST‘s approach could solve the existing problem of testing feasibility. Further more, the study use the new IST‘s approach to examine 「the fixed load」, 「the progressively increasing load」and 「the progressively decreasing load」. These three type of load have the same total load. The numerical result shows that IST‘s capacity have to increase 1.18 times, 1.32 times and unchanged separately. The study can use as a design information to help personnel in the air conditioning field to understand the IST‘s characteristic for HVAC system.
參考文獻
2. Drees, K.H. and Braun, J.E. ”Modeling of Area-Constrained Ice Storage Tanks ”, ASHRAE, HVAC&R Reserch, Vol.1, No.2, pp.143-159, 1995
Ph.D. thesis, University of Colorado at Boulder, 1996
9. Seban, R.A. and McLaughlin, E.F. ”Heat transfer in tube with laminar and turbulent flow”, Int. Journal of Heat Mass Transfer, Vol.6, pp.387-395, 1962
15. Zhu, Y. and Zhang, Y. “Modeling of thermal processes for internal melt ice-on-coil tank including ice-water density difference”, Energy and Buildings 33 , pp.363-370, 2001
1. Jekel, T.B., Mitchell, J.W. and Klein, S.A. “Modeling of Ice Storage Tanks ”, ASHRAE Transactions, Vol.99, No.1, pp.1016-1024, 1993
延伸閱讀
- 楊海庭（1997）。儲冰式空調系統之研究。中國冷凍空調雜誌，(31)，138-147。https://doi.org/10.7088/CJRACT.199704.0138
- 游凱欣、蔡尤溪、林金童（2012）。直接接觸冰晶式儲冰系統熱質傳研究。冷凍空調與能源科技雜誌，(76)，56-62。https://doi.org/10.7087/JEHVACE.201208.0056
- 柯明村、翁慶岳（2002）。內溶冰儲冰系統之控制策略分析。冷凍與空調，(16)，86-94。https://doi.org/10.7087/JRACT.200208.0086
- 方貴銀、張維（2001）。平板式冰蓄冷器融冰放冷過程動態特性研究。冷凍與空調，(8)，165-171。https://doi.org/10.7087/JRACT.200104.0165
- 蔡尤溪、李魁鵬、李文興、Chih-Kai Hsu、Chiao-Hung Cheng、Hui-Ching Chen、Hsu-Yao Huang（2003）。Economic Analysis of Ice Storage Air Conditioning System。冷凍與空調，(24)，94-104。https://doi.org/10.7087/JRACT.200312.0094