臺灣博碩士論文加值系統

摘 要
本實驗以噴霧的方式來增強扁平管平行流冷凝器的熱傳性能。於一開放式風洞中進行冷凝器在不同噴霧量、風量及相對濕度下，其熱傳與壓降性能的變化。噴霧的方式為利用伯努力定律，配合文氏管噴霧器將水分噴於入口空氣中，因水份蒸發帶走熱量，來降低空氣入口溫度，達到熱傳增強的效果。
實驗結果發現，噴霧方式確實能提升熱傳性能，但應注意噴霧量不可超出空氣的飽合量，否則多餘的水分將會積於鰭片之間，造成壓降增加，熱傳效果也得不到提升。

Experiments were conducted in this research to investigate the influence of enhancing the heat transfer performance of condencer by condensing water.
Different spray rate,flow velocity and relative humidity was tested in an open style wind tunnel to understand the chang of heat transfer and pressure drop performance.

目 錄
頁次
摘要------------------------------------------------------------------------------------------i
目錄-----------------------------------------------------------------------------------------ii
表目錄--------------------------------------------------------------------------------------iv
圖目錄--------------------------------------------------------------------------------------vi
符號說明----------------------------------------------------------------------------------ix
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-------------------------------------------------------------------------7
2.1百葉窗型鰭片熱交換器熱傳及摩擦分析----------------------------------------7
2.2質傳分析-------------------------------------------------------------------------------8
2.3噴霧相關的實驗---------------------------------------------------------------------11
2.4結論與研究方向----------------------------------------------15
第三章 測試系統與實驗方法---------------------------------------------------------21
3.1測試系統-------------------------------------------------------------------------21
3.1.1開放式風洞------------------------------------------------------------------21
3.1.2熱水循環系統---------------------------------------------------------------22
3.1.3噴霧系統---------------------------------------------------------------------22
3.1..4實驗量測設備---------------------------------------------------------------22
3.2測試件---------------------------------------------------------------------------------24
3.3實驗方法------------------------------------------------------------------------------24
3.4熱交換器熱傳增強之資料分析--------------------------------------------------25
3.4.1熱傳分析-----------------------------------------------------------------------25
3.4.2壓降分析-----------------------------------------------------------------------30
3.4.3空氣流量量測-----------------------------------------------------------------31
第四章 結果分析與討論---------------------------------------------------------------42
4.1冷凝器未噴霧與噴霧的性能比較-----------------------------------------------42
4.2.質傳理論分析比較-----------------------------------------------------------------45
第五章 結論------------------------------------------------------------------------------71
參考文獻----------------------------------------------------------------------------------72
實驗誤差分析----------------------------------------------------------------------------74

參考文獻
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Davenport, C. J., 1983,”Correlation for Heat Transfer and Flow Friction Characteristics of Louver Fin ,” Heat Transfer-Seattle 1983, N. M. Farukhi, editor, AIChE Symposia Series, V-79, No. 225.
Kays, W. M., and London, A. L., 1984, “Compact Heat Exchangers,” 3th ed, McGraw-Hill, New York.
Kettleborough ,C. F., Hsieh ,C.S.,1983, “The Thermal Performance of the Wet Surface Plastic Plastic Plate Heat Exchanger Used as an Indirect Evaporative Cooler,” Transactions of the ASME,Vol. 105,pp.366-373
Nakayama, W., Kuwahara, H., and Hirasawa, S., 1988. “Heat Transfer from Tube Banks to Air/Water Mist Flow,” International Journal of Heat Mass Transfer, Vol. 31, No.2,.pp.449-460.
Hamlin, S., Hunt ,R., and Tassou, S.A.,1998, “Enhancing the performance of evaporative spray cooling in air cycle refrigeration and air conditioning technology,” Applied Thermal Engineering,Vol18 pp.
1139-1148.
Schmidt, T. E., 1945-1946, “La Production Calorifique des Surfaces Munies D’ailettes,” Annexe DuBulletin De L’Institut International Du Froid ,Annexe G-5, quoted in McQuiston, F. C., and Parker, J. D., 1994.
Webb, R.L.,1994, “Principles of Enhanced Heat Transfer ,” Wiley, New York, pp.520-531.
Yang, W-J. , and Clark, D. W.,1975.,“ Spray Cooling of Air-Cooled Compact Heat Exchangers,” International Journal of Heat and Mass Transfer, pp. 311-317.
胡毓堂，2002，“噴霧熱傳增強冷凝器及空調機性能測分析,”碩士論文，中央大學機械系。