奈米流體之混合散熱系統實驗平台建立與性能評估

• Main Authors: Hung-Jhih Gu, 古浤志
• Other Authors: Yeou-Feng Lue
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/03605950529400628216

碩士 === 國立臺灣師範大學 === 工業教育學系 === 101 === This research mainly designs a hybrid heat dissipation system which uses a proportional valve to control coolant flow rates in two paths in order to cool dual power sources at the same time so that thermal efficiency of Carbon nanotubes/Water nanofluids (CNWNs) can be increased. First, an experimental platform is established for the assessment of the innovation. Mechanical elements (coolant, cooling system components) and electrical elements (actuators, sensors, data recorders, etc.) are included. This experimental employed two heating sources of total 1000W; the coolant flow rates are: 3, 5, and 7L/min.; the proportional-valve voltage is within 0.6-3V. Through steady state experimental results, we searched proper valve voltages and flow rates to keep two power sources at optimal operating temperatures. Then, we can further select best operations for the transient experiments. Second, we used two-step synthesis method for producing CNWNS. The experiments for thermal conductivity, density, viscosity, specific heat and heat dissapation performance at difference temperatures and concentrations were conducted for both bulk fluid (water) and CNWNS. Experimental results demonstrate that: (1)0.125wt.% CNWNS have optimal thermal efficiency; (2)for the steady-state experimental, different flow rates have difference heat exchange values and 10% efficiency was increased for CNWNS compared to water; (3)for the transient experiments, CNWNS have better thermal efficiency than water. The heat dissapation of CNWNS compared with water is increase for 5~17%. This research shows that using CNWNS can reduce the occupied volume of heat exchanger and pump of this green thermal management system.The contributions for space arrangement, traveling distance and energy reduction will be verified for Evs in the near future.