冷媒R-245fa於不同石墨烯塗佈鰭管上凝結熱傳性能之實驗分析

NCUIR > Engineering College > Energy of Mechatronics > Electronic Thesis & Dissertation > Item 987654321/79527

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/79527

Title:	冷媒R-245fa於不同石墨烯塗佈鰭管上凝結熱傳性能之實驗分析
Authors:	潘軒毅;Pan, Hsuan-Yi
Contributors:	能源工程研究所
Keywords:	石墨烯;氟化石墨烯;鰭管;冷凝熱傳性能;R-245fa
Date:	2019-01-30
Issue Date:	2019-04-02 14:45:42 (UTC+8)
Publisher:	國立中央大學
Abstract:	石墨烯具有高化學穩定性及高耐久性的特點，所以可將石墨烯塗佈在熱傳表面上形成疏水性表面。然而對於低表面張力的液體，塗佈石墨烯無法形成滴狀冷凝以提升熱傳性能，但實際上塗佈石墨烯仍達到接觸角提升與表面能降低的效果。本研究使用化學氣相層積法 (CVD)，將石墨烯與氟化石墨烯塗佈至純銅鰭管表面上以提升冷凝熱傳性能，並將測試鰭管置於本實驗室設計之可視化冷凝實驗系統中，透過量測工作流體 R-245fa 之管外冷凝熱傳係數及觀察冷凝液滯留在鰭片間距的情形，比較一般鰭管表面、石墨烯表面與氟化石墨烯表面的差異。期望透過增加接觸角，在鰭片壁面上的未淹沒區域有更少的冷凝液滯留使熱傳面積增加以提升熱傳性能。;Graphene has the features of high chemical stability and high durability, so graphene can be coated on heat transfer surface to form hydrophobic surface. However, for liquid with low surface tension, graphene coating can’t form drop condensation to improve heat transfer performance. But in fact, graphene coating still can reach the contact angle increasing and surface energy reducing effect. This study adopts Chemical Vapor Deposition (CVD) to make graphene and fluorinated graphene be coated on pure copper integral fin tube surface to improve condensation heat transfer performance and also put the test integral fin tube in the visible condensation experiment system that is designed by this laboratory to compare differences between general integral fin tube surface, graphene surface and fluorinated graphene surface through measuring the outside condensation heat transfer coefficient of the working fluid R-245fa and observing the status of condensate between fins. It’s expected that the drainage area on fin flank has less condensate by increasing the contact angle so that heat transfer area can be increased to improve heat transfer performance.
Appears in Collections:	[Energy of Mechatronics] Electronic Thesis & Dissertation

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