薄矽膠層吸附床之性能研究; Experimental investigation of an adsorber with thin silica gel layer

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Title:	薄矽膠層吸附床之性能研究;Experimental investigation of an adsorber with thin silica gel layer
Authors:	陳又維;Yu-wei Chen
Contributors:	能源工程研究所
Keywords:	吸附式製冷;塗佈式吸附床;薄膜鍍層;微熱交換器;thin-coating layer;micro-heat exchanger;silica gel-water;adsorption cooling;coated adsorber
Date:	2010-03-14
Issue Date:	2010-06-10 16:54:15 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究主要目的為設計一小型化、高性能之吸附床，以供未來固體吸附式製冷系統使用。吸附床設計應用微熱交換器概念，改變以往大管徑設計方式，而選用小管徑熱交換器設計；並在微熱交換器表面製作出薄矽膠層，以提高反應速率，期望可縮小系統體積以及降低整體製作成本目的，而完成一高性能低成本之空調製冷系統。由實驗結果可發現，吸附床在吸附初期具有最大之冷媒吸附速率；在30 °C 吸附溫度、吸附床腔體內冷媒蒸汽壓為8.55 torr 時，第一分鐘有最大吸附速率約0.567 g/s。當吸附床以80 °C 脫附溫度、吸附床腔體內冷媒蒸汽壓為39.53 torr 時，脫附四分鐘後有最大脫附速率約0.109 g/s。吸附溫度與脫附溫度對吸附床吸附與脫附性能有顯著影響。當吸附溫度由40 °C 改變為20 °C 時，吸附速率可提升約32%；脫附溫度由60 °C改變為80 °C 時，脫附速率可提升約142%。 The main purpose of this research is to design a compact adsorber with high performance, which will be applied to a solid adsorption cooling system. A test system is build up in order to measure the adsorption and desorption performance of the test section. Micro-heat exchanger concept is applied to design the adsorber heat exchanger. The smaller tube size is chosen to replace the bigger tube which is widely used in the former research. Meanwhile, a thin-layer coating technique is used to develop a adsorber—adsorbent is directly coated on the heat exchanger surface.This thin-layer coated adsorber will accelerate the response time including heat transfer and mass transfer. So this micro-heat exchanger design with a thin-layer coated adsorber is expected to reduce the whole system volume and enhance the performance to decrease the cost of adsorption cooling system. The test results show that adsorption/desorption temperature has significant effect on performance. When adsorption time is 1 minute, the adsorber has the maximum adsorption rate— 0.567 g/s. When desorption time is 4 minute, the adsorber has maximum desorption rate— 0.109 g/s.
Appears in Collections:	[Energy of Mechatronics] Electronic Thesis & Dissertation

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