Estimation of the Incident Solar Heat Flux and Extinction Coefficient

• Main Authors: Po-YuChen, 陳柏瑜
• Other Authors: Han-Taw Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/55882944604968541479

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 98 === In this thesis, we will discuss the heat transfer phenomenon of clear glass under transient condition. We utilize two dimension transient heat diffusion physical model in which the heat generation term is included to describe the heat transfer phenomenon of clear glass. First of all, we apply the numerical method inclusive of Laplace transform and inverse Laplace transform, finite difference method and Gauss elimination method to solve the temperature distribution of the clear glass under varies incident solar heat flux. This is so called direct heat conduction problem. Then, we use the simulated temperature as exact value and fill it into the inverse algorithm in this thesis. The inverse algorithm includes Laplace transform and inverse Laplace transform, finite difference method, Gauss elimination method and corresponds with the least square method to modify the temperature errors then gets the incident solar heat flux. Then, we compare the estimated values with the exact values we supposed to verify the reliability under practical experimental setup. Later, we designate a set of experimental system which heats the glass with radiant heat and measure the heated face and cooling face temperature of glass along with air temperature of both faces. We then fill the measured temperature into inverse algorithm to get the incident solar heat flux and extinction coefficient of clear glass. At last, we compare the estimated values with practical power of heated lamp and references; consequently, the outcome shows that these two values are quite close, therefore we verify the accuracy and reliability of the inverse method in our thesis.