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姓名 林岳宏(Yueh-Hung Lin) 查詢紙本館藏 畢業系所 機械工程學系 論文名稱 流動方向對兩相冷媒在板式熱交換器內
(Effect of Flow Direction for the Heat Transfer Performance of Refrigerant R-410A Evaporation in Plate Heat Exchanger)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 隨著冰水機及熱泵等設備之法定COP日漸提昇且設備體積小型化的需求，板式熱交換器被廣泛應用於冷凍空調系統中。但板式熱交換器蒸發熱傳性能的公開測試資料仍非常缺乏，導致設計者要準確預估板式熱交換器蒸發熱傳性能的難度極高。
為解決此一問題，本研究以實驗方法進行R410A冷媒對水在板式熱交換器內之蒸發熱傳實驗，探討逆向流與同向流蒸發熱傳性能的差異及不同的冷媒出口過熱度對蒸發熱傳性能的影響，並建立蒸發熱傳性能的預估方法。實驗同時利用紅外線熱像儀觀察板片表面溫度場，分析冷媒的飽和區與過熱區是否與預估的相同，以驗證蒸發熱傳性能預估方式的準確性，作為未來板式熱交換器設計者設計之依據。
實驗時測試段冷媒入口乾度為0.24，冷媒蒸發溫度為1.1 oC，冷媒出口過熱度為2 oC及5 oC。依實驗結果分別探討蒸發段熱傳性能及整體熱傳性能，同向流之蒸發段熱傳係數比逆向流高，但總體熱傳性能除了受流動方向影響外，也與出口過熱度有關。當冷媒出口過熱度較低時，同向流動之整體熱傳性能與逆向流動沒有差異。當冷媒出口過熱度較高時，同向流動之整體熱傳性能低於逆向流動。
摘要(英) Plate heat exchangers have been popularly used in industrial applications and air-conditioning systems for several decades due to their high effectiveness and compactness. However, owing to its flow complexity, very few test results have been published in the literature for evaporation heat transfer of refrigerant in plate heat exchangers. This article provides an experimental investigation and Infrared Thermal Image observation on the evaporation heat transfer of refrigerant R-410A in plate heat exchanger with various flow arrangement and exit superheat conditions. Parallel flow and counter flow arrangements with 2 oC, 5 oC and 10 oC exit superheat conditions were tested. The refrigerant entered the test section at as vapor quality of 0.24 and evaporated at a saturation temperature of 1.1 oC. The experimental results were analyzed by the evaporation heat transfer coefficient and overall average heat transfer coefficient separately. The evaporation heat transfer coefficient in parallel-flow arrangement is higher than that in the case of counterflow arrangement. However, the average heat transfer coefficients are affected not only by the flow direction, but also by the exit superheat condition. The interaction of these two effects causes there to be almost no difference of the average heat transfer performance between these two flow arrangements for low exit superheat condition. While the refrigerant exit superheat is high, the overall heat transfer performance of the parallel-flow case is lower than that of the counterflow case. 關鍵字(中) ★ 板式熱交換器
★ 逆向流
★ 同向流
★ 蒸發熱傳性能
★ 紅外線熱像關鍵字(英) ★ Plate heat exchanger
★ Counter flow
★ Parallel flow
★ R410A evaporation heat transfer performance
★ Infrared Thermal Image論文目次 目 錄
摘要 i
Abstract ii
目錄 iv
表目錄 vii
圖目錄 viii
符號說明 xiv
第一章、前言 1
第二章、文獻回顧 8
2.1前言 8
2.2板片幾何參數對熱傳性能的影響 10
2.3冷媒在板式熱交換器內之熱傳性能與壓降 12
2.4流動方向對冷媒蒸發熱傳性能的影響 15
第三章、實驗方法 30
3.1測試段 31
3.2實驗系統 31
3.3實驗量測設備 34
3.3.1 資料擷取系統 34
3.3.2水流量計校正 34
3.3.3壓力計校正 35
3.3.4壓差校正 35
3.3.5溫度校正 36
3.3.6紅外線熱像儀溫度校正 36
3.3 實驗步驟 38
3.4 數據換算 39
3.4.1水側數據換算 39
3.4.2汽態冷媒實驗數據換算 40
3.4.3兩相冷媒實驗數據換算 42
第四章、實驗結果與討論 63
4.1蒸發熱傳實驗結果 63
4.2山形紋板片表面溫度觀察實驗結果 71
第五章、結論 100
參考文獻 103
參考文獻 Djordjevic, E., and Kabelac, S., 2008, “Flow Boiling of R134a and Ammonia in a Plate Heat Exchanger,” International Journal of Heat and Mass Transfer, Vol. 51, 6235–6242.
Fernando, P., Palm, B., Lundqvist, P., and Granryd, E., 2004, “Propane Heat Pump with Low Refrigerant Charge: design and laboratory tests,” International Journal of Refrigerant, Vol. 27, pp. 761 - 773.
Focke, W. W., and Knibble, P. G., 1984, “Flow Visualization in Parallel Plate Ducts with Corrugated Walls,”CSIR Report CENC M-519, CSIR, Pretoria, South Africa.
Focke, W. W., Zachariades, J., and Oliver, I., 1985, “The Effect of Corrugation Onclination Angle on the Thermohydraulic Performance of Plate Heat Exchangers,” International Journal of Heat and Mass transfer, Vol. 28, pp. 1469 - 1479.
Han, D. H., Lee, K. J., and Kim, Y. H., 2003 “Experiments on the Characteristics of Evaporation of R410A in Brazed Plate Heat Exchangers with Different Geometric Configurations,” Applied Thermal Engineering, Vol. 23, pp.1209 - 1220.
Hsieh, Y. Y., and Lin, T. F., 2003 “Evaporation Heat Transfer and Pressure Drop of Refrigerant R-410A Flow in a Vertical Plate Heat Exchanger,” ASME Journal of Heat Transfer, Vol. 125, pp. 852 - 857.
Kedzierski, M. A., 1997, “Effect of Inclination on the Performance of a Compact Brazed Plate Condenser and Evaporator,” Heat Transfer Engineering, Vol. 18, No. 3, pp. 25 - 38.
London, L., and Kays, W. M., 1998, Compact Heat Exchanger, Krieger Publishing, Malabar, Florida, U.S.A.
Longo, G. A., and Gaspare, A., 2007, “Heat Transfer and Pressure Drop During HFC Refrigerant Vaporization Inside a Brazed Plate Heat Exchanger,” International Journal of Heat and Mass transfer, Vol. 50, pp. 5194 - 5203.
Marriot, J., 1971, “Where and How to use Plate Heat Exchangers,” Chemical Engineering Progress, Vol. 78, No. 8, pp. 127 - 133.
Yan, Y. Y., and Lin, T. F., 1999 “Evaporation Heat Transfer and Pressure Drop of Refrigerant R-134a in a Plate Heat Exchanger,” ASME Journal of Heat Transfer, Vol. 121 PP. 118 - 127.
Yang, C. Y., Lin, Y. H., and Lin, F. Ch., 2013, “Effect of Flow Direction for the Heat Transfer Performance of Refrigerant R-410A Evaporation in a Plate Heat Exchanger,” Heat Transfer Engineering, Vol. 34, pp. 1133 – 1139.
Živković, E., Kabelac, S., and Šerbanović, S., 2009, “Local Heat Transfer Coefficients During the Evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a Plate Heat Exchanger,” Journal of Serbian Chemical Society, Vol. 74, No. 4, 427-440.
王啟川，2007，熱交換器設計，五南圖書出版有限公司，臺北市。
林佩芝，1995，幾何參數對板式熱交換器性能之影響，國立交通大學機械工程研究所碩士論文。
翁嘉鴻，2002，水對水板式熱交換器性能測試分析，國立中央大學機械工程研究所碩士論文，中壢。
指導教授 楊建裕(Chien-Yuh Yang) 審核日期 2015-8-31 推文 plurk
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