Effect of the vacuum pressure and the working fluid inventory to the maximum heat loading (Qmax) of the heat pipe

• Main Authors: Hsu, Kuo-Hwai, 徐國懷
• Other Authors: Lin, Wei-Keng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/89829694360813389222

碩士 === 國立清華大學 === 工程與系統科學系 === 99 === Over the last decade, the computer clock speed drastically increases as the chip manufacturing technique improves. Heat pipe generally is already applied to the heat&removed system, the notebook and other equipments. Due to the reason of the operation temperature of the CPU need to less than 100℃, a high vacuum status of the heat pipe must design for achieved to high heat transport ability. Therefore, the heat pipe performance ability not only depends on the geometric parameters such as heat pipe wall thickness、tube material etc., but also depends on the working fluid thermo properties such as latent heat、 vapor pressure、viscosity、inventory and vacuum pressure etc.. The purpose of this study was to evaluate the effect of the inventory and the vacuum pressure to the maximum heat transport ability of the heat pipe. The experiment was operated under the vacuum pressure of the heat pipe at the range of 0.1torr to 10torr, while the inventory was controlled with the range of 0.5ml to 1ml. The results shown the errors between the experimental data and the theoretical value were within 10%. The experiment was also shown when the higher of the vacuum pressure, the lower of the non&condensable gas (NCG), the higher of the maximum heat transport ability (Qmax). The curve for the Qmax with respect to the vacuum pressure turns out to be an exponential function. Keywords: Heat Pipe, Vacuum Pressure, Maximum Heat Transfer, Non&condensation Gas (NCG), inventory