書報討論 2021/02/25:(1)與微生物不期而遇 (Serendipity in Microbiology)
                    (2)Effect of Superhydrophobicity on Condensate Retention in
                                              Air-Cooling Heat Exchangers Operating under Wet Conditions  

• 2021-02-23
• admin

主講人(1): 陳恕行博士
講題：與微生物不期而遇 (Serendipity in Microbiology)
時間：2021/2/25 (周四) 4:10 pm - 5:20 pm
地點：工程五館 B1 國際會議廳
摘 要:
在尋找解決文蛤大量死亡的問題時, 我與微生物不期而遇。 我們有數不盡的朋友, 為何不找它們解決更多的問題? 文蛤養殖不只生產營養豐富的食物，更是自然的固碳機制。共生是建構一個健康, 高生產力養殖系統的關鍵，期望物聯網協助我們鎖定共生關係是否建立， 我們在文蛤養殖場發現三個共生關係。第一是光合菌與土壤微生物共生，可減少有機物在池底累積， 第二為微藻-鈣化生物共生，可促進生物鈣化， 第三為菌藻共生， 可增加太陽能吸收提高生產力。 這些共生關係都是在不期而遇的情況下發現的，我將分享有趣的發現過程。透過對溶氧、 pH、 水色、水透視度等資料的分析， 我們希望找到一些規律讓物聯網系統判斷共生是否發揮效用。
主講人簡介: 崑山科技大學機械工程系副教授、大汕蘆海水養殖場共同經營人、美國佛羅里達大學機械工程博士

Seminar Speaker (2):  Muneeshwaran M, Ph.D. Candidate
Title: Effect of Superhydrophobicity on Condensate Retention in Air-Cooling Heat Exchangers Operating under Wet Conditions
Date：2021/2/25 (Thursday) 3:40 pm – 4:10pm
Location： Engineering 5 Building B1 International Conference Hall (工程五館 B1 國際會議廳)
Abstract: The condensate retention and bridging on the airside of the heat exchanger, such as the evaporator of the heat pump and air-conditioning system, can adversely increase the pressure drop penalty and energy consumption of the heat transfer systems. The objective of this study is to minimize the airside pressure drop of the rectangular plain heat exchangers using superhydrophobic coating which promotes continuous condensate shedding through coalescence induced droplet jumping. The experiments are carried out for different inlet air temperatures (23 ◦C and 27 ◦C), relative humidities (50%, 70%, and 90%) and the fin base temperature is fixed to be 7 ◦C. While the frontal air velocity is varied from 0.5 to 2.5 m/s, and the fin spacing ranges from 1 mm to 4 mm. The results showed that the heat transfer rate between untreated and superhydrophobic heat exchanger is almost similar; whereas a 30–55% increase in heat transfer is observed when inlet air temperature increased from 23 ◦C to 27 ◦C and an increase of 20–50% and 60–100% in heat transfer is noticed when relative humidity increased from 50% to 70% and 90%, respectively. Due to the effective condensate removal and the early arrival of steady state, the airside pressure drop for the superhydrophobic heat exchanger is almost two times lower than that of the untreated one. The reduction in airside pressure drop led to appreciable energy saving of the heat transfer system, and it is found that 30–60% saving can be achieved especially at higher relative humidities (70% or 90%) and frontal air velocities (more than 1 m/s).