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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蘇金佳 | |
dc.contributor.author | Chao-Jen Li | en |
dc.contributor.author | 李昭仁 | zh_TW |
dc.date.accessioned | 2021-06-13T17:29:09Z | - |
dc.date.issued | 2004 | |
dc.date.submitted | 2004-09-13 | |
dc.identifier.citation | 參 考 文 獻
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/39464 | - |
dc.description.abstract | 本研究針對目前生活上最常使用的空調與食品冷凍系統,設計並建立一套串聯式雙蒸發器冷凍系統,並以丙烷作為冷媒,填充於串聯式雙蒸發器的冷凍系統,以進行實驗測試及數值模擬,並分析各種變因對系統性能的效應,其主要目的為符合環保需求與提高系統效率。
系統中的主要元件包括往復式壓縮機、氣冷式冷凝器、高溫毛細管、高溫蒸發器、低溫毛細管、低溫蒸發器等。本實驗的操縱變因包括系統的冷凝壓力、高溫毛細管的長度、低溫毛細管的長度、壓縮機頻率等。實驗所探討的系統性能則包括冷媒流率、高溫和低溫蒸發器內的冷媒熱傳係數、高溫和低溫蒸發器的冷凍能力、系統性能係數(COP)等。 實驗結果顯示,冷媒質量流率隨著冷凝壓力與過冷度的提高而變大,隨著高溫和低溫毛細管長度的增長而減小,而隨著壓縮機頻率的提高而稍微地變大。冷媒在高溫蒸發器內的熱傳係數會隨著冷凝壓力的提升而變小,隨著高溫毛細管長度的增長而稍微變大,隨著低溫毛細管長度的增長而變小,隨著壓縮機頻率的變大而變化不大。冷媒在低溫蒸發器的熱傳係數隨著冷凝壓力的提升而稍微變小,隨高溫毛細管長度的增長而變小,隨低溫毛細管長度的增長而變動不大,隨著壓縮機頻率的變大而變大。高溫蒸發器的冷凍能力隨著冷凝壓力的提升而下降,隨高溫毛細管長度的增長而變大,隨低溫毛細管長度的增長而變小,隨壓縮機頻率的變大而變化不大。低溫蒸發器的冷凍能力隨著冷凝壓力的提升而下降,隨著高溫毛細管長度的增長而變大,隨低溫毛細管長度的增長而變動不大,隨著壓縮機頻率的變大而變大。系統性能係數隨著冷凝壓力的提升而下降,隨著高溫毛細管長度的增長而變大,隨著低溫毛細管長度的增長而下降,隨著壓縮機頻率的變大而變大。 本研究利用Buckingham 理論來模擬串聯式雙蒸發器冷凍系統其性能的無因次方程式,所得的無因次方程式可用來模擬系統的冷媒質量流率、高溫蒸發器內的冷媒熱傳係數、低溫蒸發器內的冷媒熱傳係數、高溫蒸發器其冷凍能力的分配率、系統的性能係數。利用無因次方程式預測以上五個性統性能的結果分別與實驗值的相對誤差值範圍為-4∼+5%、-16∼+16%、-12∼+16%、-10∼+10%、-19∼+17%。 將文獻中所提出有關模擬冷媒質量流率與冷媒兩相熱傳係數的經驗方程式與本研究所得的結果作比較,結果發現,本研究的結果與文獻的結果有相近的趨勢,且本研究所提出模擬系統性能的無因次方程式在使用上較方便且準確度也不錯。 | zh_TW |
dc.description.abstract | The performance of a refrigerating system with an environment-friendly refrigerant, propane(R-290)as the refrigerant, was experimentally studied. There were two evaporators connected in series within the system. The objective of the present study is to conform to the environmental protection and to increase the efficiency of the system.
The system is mainly composed of a reciprocating compressor, a condenser, high- and low-temperature capillary tubes, and high- and low-temperature evaporators. The experimental results show that the mass flow rate of the refrigerant increases with the condensing pressure and the subcooling degree of the refrigerant, decreases with the lengths of the high- and low-temperature capillary tube, and increases slightly with the frequency of the compressor. The heat transfer coefficient of the refrigerant in the high-temperature evaporator decreases with the condensing pressure, increases slightly with the length of the high-temperature capillary tube, decreases with the length of the low-temperature capillary tube, and changes not apparently with the frequency of the compressor. The heat transfer coefficient of refrigerant in the low-temperature evaporator decreases slightly with the condensing pressure, decreases with the length of the high-temperature capillary tube, changes not apparently with the length of the low-temperature capillary tube, and increases with the frequency of the compressor. The cooling capacity of the high-temperature evaporator decreases with the condensing pressure, increases with the length of the high-temperature capillary tube, decreases with the low-temperature capillary tube, changes not apparently with the frequency of the compressor. The cooling capacity of the low-temperature evaporator decreases with the condensing pressure, increases with the length of the high-temperature capillary tube, changes not apparently with the length of the low-temperature capillary tube, and increases with the frequency of the compressor. The coefficient of performance(COP)of the system decreases with the condensing pressure, increases with the length of the high-temperature capillary tube, decreases with the length of the low-temperature capillary tube, increases with the frequency of the compressor. Based on Buckingham Pi theorem, this dissertation derives the dimensionless correlations for the characteristics of a series-connected two-evaporator refrigerating system with propane (R-290) as the refrigerant. Experimental data are substituted into the correlations to show the most relevant factors. Simplified correlations are then obtained. The results show that the mass flow rate of refrigerant ( ) is mainly affected by the condensing pressure, the length of the high-temperature capillary tube, and the subcooling of refrigerant, while the heat transfer coefficients of refrigerant in the evaporators (hr,He and hr,Le) are affected by the condensing pressure and the logarithmic-mean temperature difference of the specific evaporator. However, hr,He and hr,Le are also affected by the lengths of the low- and high-temperature capillary tube, respectively. Additionally, the ratio of the cooling capacity of the high-temperature evaporator to the total capacity ( ) is mainly affected by the condensing pressure and the logarithmic-mean temperature difference of both evaporators. The COP of the system is mainly affected by the condensing pressure, the frequency of the compressor, and the logarithmic-mean temperature difference of both evaporators. Compared with the results of the study, the predicted results by some correlations from literatures about the mass flow rate and the two-phase heat transfer coefficient of the refrigerant have the same consistency. However, the required variables of the correlations in this study are much fewer than those of the correlations from literatures. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T17:29:09Z (GMT). No. of bitstreams: 1 ntu-93-D87522013-1.pdf: 7674690 bytes, checksum: cc85060c2dfec890102812519ad3f0df (MD5) Previous issue date: 2004 | en |
dc.description.tableofcontents | 目錄
誌謝……………………………………………………………..I 摘要………………………………………………...…………..II Abstract………………………………………..………………IV 目錄……………………………………………...………...….VI 表目錄…………………………………………………...…...XII 圖目錄…………………………………………………..…..XIII 符號說明…………………………………………………..XVIII 第一章 緒論……...……………………………………………………….1 1-1 研究背景……..…………………………………………………1 1-2 研究方向………………………………………………………..5 第二章 文獻回顧與研究目的……………………………………….6 2-1 相關文獻回顧………………………………………………….6 2-1-1 碳氫化合物為替代冷媒應用於冷凍空調系統……..…..6 2-1-2 冷凍空調系統的迴路設計…………………………..…..8 2-1-3 冷凍系統性能的模擬…………………………………..10 2-2 研究目的………………………………………………………12 第三章 實驗方法………………………………………………………16 3-1 理論介紹……………………………………………………...16 3-1-1 串聯式雙蒸發器冷凍循環…………………………..16 3-1-2 冷凍系統之參數……………………………………..18 3-1-3 丙烷為冷媒之評估…………………………………..19 3-1-4 二次冷媒乙二醇簡介………………………………..21 3-2 實驗設備介紹…………………………………………………22 3-2-1 串聯式雙蒸發器冷凍系統主體……………………….22 3-2-2 蒸發器的熱交換流體迴路系統……………………….26 3-2-3 量測系統與安全保護設備…………………………….27 3-2-4 電路控制裝置………………………………………….29 3-3 實驗的操縱變因………………………………………………29 3-4 實驗步驟……………………………………………………….29 3-4-1 實驗前的準備步驟………………………………….29 3-4-2 實驗的進行步驟…………………………………….30 3-5 實驗數據分析………………………………………………...31 3-6 實驗注意事項………………………………………………...38 第四章 模擬方法………………………………………………………40 4-1 模擬方法的理論……………………………………………..40 4-1-1 Buckingham 理論的介紹…………………………40 4-1-2 無因次方程式的推導………………………………41 4-2 串聯式雙蒸發器冷凍系統的性能模擬…………………...42 4-2-1 串聯式雙蒸發器冷凍系統的無因次參數群組…….42 4-2-2 串聯式雙蒸發器冷凍系統的無因次方程式……….43 第五章 結果與討論………………………………………………...…50 5-1 壓力-焓關係圖……………………………………………..50 5-2 冷凝壓力對系統性能的影響………………………………52 5-2-1 冷凝壓力對低溫蒸發器壓力 和系統總壓力差的影響……………………………52 5-2-2 冷凝壓力對系統高低壓力比的影響………………52 5-2-3 冷凝壓力對冷媒質量流率的影響…………………53 5-2-4 冷凝壓力對高溫毛細管壓降佔系統總壓降其比例的影響…………………………………………………54 5-2-5 冷凝壓力對過冷度的影響…………………………54 5-2-6 冷凝壓力對高溫蒸發器其對數平均溫度差的影響……………………………………………………55 5-2-7 冷凝壓力對低溫蒸發器其對數平均溫度差的影響……………………………………………………55 5-2-8 冷凝壓力對高溫蒸發器冷凍能力的影響…………55 5-2-9 冷凝壓力對低溫蒸發器冷凍能力的影響…………56 5-2-10 冷凝壓力對系統總冷凍能力的影響………………57 5-2-11 冷凝壓力對高溫蒸發器其冷凍能力的分配率的影響……………………………………………………57 5-2-12 冷凝壓力對壓縮機功率的影響……………………58 5-2-13 冷凝壓力對系統性能係數的影響…………………58 5-3 高溫毛細管長度對系統性能的影響…………….………..59 5-3-1 高溫毛細管長度對低溫蒸發器壓力和系統總壓力差的影響………………………………………………59 5-3-2 高溫毛細管長度對系統的高低壓力比之影響……59 5-3-3 高溫毛細管長度對冷媒質量流率的影響…………59 5-3-4 高溫毛細管長度對高溫毛細管壓降佔系統總壓降其比例的影響…………………………………………60 5-3-5 高溫毛細管長度對高溫蒸發器其對數平均溫度差的影響…………………………………………………61 5-3-6 高溫毛細管長度對低溫蒸發器其對數平均溫度差的影響…………………………………………………61 5-3-7 高溫毛細管長度對高溫蒸發器冷凍能力的影響…62 5-3-8 高溫毛細管長度對低溫蒸發器冷凍能力的影響…62 5-3-9 高溫毛細管長度對系統總冷凍能力的影響………63 5-3-10 高溫毛細管長度對高溫蒸發器其冷凍能力的分配率的影響………………………………………………64 5-3-11 高溫毛細管長度對壓縮機功率的影響……………64 5-3-12 高溫毛細管長度對系統性能係數的影響…………64 5-4 低溫毛細管長度對系統性能的影響……………………...65 5-4-1 低溫毛細管長度對冷媒質量流率的影響…………65 5-4-2 低溫毛細管長度對高溫蒸發器冷凍能力的影響…65 5-4-3 低溫毛細管長度對低溫蒸發器冷凍能力的影響…66 5-4-4 低溫毛細管長度對系統總冷凍能力的影響………67 5-4-5 低溫毛細管長度對壓縮機功率的影響……………67 5-4-6 低溫毛細管長度對系統性能係數的影響…………68 5-5 壓縮機頻率對系統性能的影響……………………………68 5-5-1 壓縮機頻率對低溫蒸發器壓力和系統總壓力差的影響…………………………………………………….68 5-5-2 壓縮機頻率對冷媒質量流率的影響……………….69 5-5-3 壓縮機頻率對高溫蒸發器冷凍能力的影響……….69 5-5-4 壓縮機頻率對低溫蒸發器冷凍能力的影響……….70 5-5-5 壓縮機頻率對壓縮機功率的影響………………….71 5-5-6 壓縮機頻率對系統性能係數的影響……………….71 5-6 改變獨立參數(冷凝壓力、高溫毛細管長度、低溫毛細管長度、壓縮機功率)對系統P-H圖的影響………….......71 5-7 無因次方程式的模擬結果………………………………….72 5-7-1 模擬冷媒質量流率的無因次方程式………………72 5-7-2 模擬高溫蒸發器內的冷媒熱傳係數之 無因次方程式………………………………………75 5-7-3 模擬低溫蒸發器內的冷媒熱傳係數之 無因次方程式………………………………………79 5-7-4 模擬高溫蒸發器冷凍能力其分配率之 無因次方程式………………………………………82 5-7-5 模擬系統性能係數之無因次方程式………………85 5-8 文獻與本研究結果的比較………………………………….88 5-8-1 利用Wolf等人提出的無因次方程式與本實驗數據( )比較………………………………………….89 5-8-2 利用Gungor-Winterton、Kandlikar、Steiner-Taborek、Wattelet等人提出的經驗式與本實驗數據(hr,He、hr,Le)的比較………………………………………………90 第六章 結論與建議…………………………………………………...96 6-1 結論…………………………………………………………...96 6-2 建議………………………………………………………….103 參考文獻…………………………………………………………………..105 附錄A 冷媒R-290與乙二醇水溶液的性質……………….….224 A-1 冷媒R-290性質方程式……………………………………..224 A-1-1 飽和狀態冷媒R-290的溫度與壓力的關係式……...224 A-1-2 飽和液態冷媒R-290的比熱方程式………………...224 A-1-3 飽和氣態冷媒R-290的比熱方程式………………...224 A-1-4 過冷液態冷媒R-290的比熱方程式………….……..225 A-1-5 過熱氣態冷媒R-290的比熱方程式………………...225 A-1-6 飽和液態冷媒R-290的導熱度方程式……………...225 A-1-7 飽和氣態冷媒R-290的導熱度方程式………...……226 A-1-8 過冷液態冷媒R-290的導熱度方程式………….…..226 A-1-9 過熱氣態冷媒R-290的導熱度方程式……………...226 A-1-10 飽和液態冷媒R-290的黏度方程式……………..….226 A-1-11 飽和氣態冷媒R-290的黏度方程式………………...227 A-1-12 過冷液態冷媒R-290的黏度方程式…………….…..227 A-1-13 過熱氣態冷媒R-290的黏度方程式……………..….227 A-1-14 飽和液態冷媒R-290的密度方程式…………...……228 A-1-15 飽和氣態冷媒R-290的密度方程式…………….…..228 A-1-16 過冷液態冷媒R-290的密度方程式…………….…..228 A-1-17 過熱氣態冷媒R-290的密度方程式………...………229 A-1-18 飽和液態冷媒R-290的焓值方程式…………..…….229 A-1-19 飽和氣態冷媒R-290的焓值方程式…………….…..229 A-1-20 過冷液態冷媒R-290的焓值方程式……………..….230 A-1-21 過熱氣態冷媒R-290的焓值方程式……………..….230 A-2 乙二醇水溶液性質方程式………………………….………230 A-2-1 乙二醇水溶液的比重方程式……………..…………230 A-2-2 乙二醇水溶液的比熱方程式……………….……….231 A-2-3 乙二醇水溶液的導熱度方程式…………….……….231 A-2-4 乙二醇水溶液的黏度方程式………………………..231 附錄B 無因次參數其型式的推導過程…………………...……233 附錄C Forster and Zuber [22] 提出兩相熱係數 的經驗公式……………………………………….…………239 附錄D 誤差分析………………………………………….…………..240 附錄E 其它附圖……………………………………………………...244 作者簡介………………………………………….……………………….259 | |
dc.language.iso | zh-TW | |
dc.title | 使用環保冷媒R-290的串聯式雙蒸發器冷凍系統之研究 | zh_TW |
dc.title | Experimental study and performance simulation of a series-connected two-evaporator refrigerating system charged with R-290 | en |
dc.type | Thesis | |
dc.date.schoolyear | 93-1 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 謝曉星,陳龍正,陳希立,李奕昇 | |
dc.subject.keyword | 雙蒸發器,環保冷媒,丙烷,串聯式, | zh_TW |
dc.subject.keyword | two evaporator,series connected,R-290,propane, | en |
dc.relation.page | 260 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2004-09-14 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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