Study on Generated Non-Condensable Gas of Flat Plate Heat Pipe and Improved Performance

• Main Authors: Tzu-wei Yang, 楊子蔚
• Other Authors: David T.W. Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/06155685540595398666

碩士 === 國立臺南大學 === 機電系統工程研究所碩士班 === 100 === The reliability of flat plate heat pipe (FPHP) made of aluminum with surface coated copper for filling acetone as working fluid has been investigated using experimental method. Performance such as temperature uniformity, thermal resistance and maximum heat transport were measured in various filling amounts of flat plate heat pipe at operating 80℃ for each 250 hours. This paper develops an effective method for exhausting non-condensable gas to improve performance of flat plate heat pipe at operating long term. The results show that increasing slope of temperature difference for 1.4g of filling amount is larger than that of 1.7g of filling amount. Moreover, the NCG generated amount is insignificantly affected by filling amount in FPHP. For operating long term the maximum heat transport rate of FPHP is higher than that of operating 0 hour. As FPHP operating 2000 hours, NCG was exhausted through flat plate heat pipe bottom heating of manufactured process, thereafter, the FPHP was operated at 80℃ to understand NCG re-generated. The generated NCG rate for flat plate heat pipe with NCG exhausted process was lower. However, thermal resistance does not improve due to the generated hydroxide Bayerite (Al(OH)3) for product of water/aluminum reaction on surface of inner and wick. The distributed NCG inside of flat plate heat pipe was sketched in detailed.