為解決高功率LED晶片接面溫度過高的問題，本論文使用固態的三水合醋酸鈉相變材料相變時大量吸收潛熱的特性，延長高功率LED能夠使用的時間。本論文使用十水合碳酸鈉作為成核劑，證實能夠有效抑制三水合醋酸鈉嚴重過冷的問題。此外本論文基於總體熱含量法的概念建立了一套快速設計的方法，藉由數學式快速計算出相變式冷卻系統的有效使用時間以及設計上需要的系統參數。此外本論文中提出相變式散熱膠囊的概念，使相變式冷卻的方法能夠被更廣泛的應用。

The junction temperature of high power LED is an essential issue for practical applications. In this work, the high latent heat of NaCH3COO·3H2O (Sodium Acetate Trihydrate, SAT) is proposed and utilized to prolong the practical using time of a high power LED. With the addition of NaCO3·10H2O as the nucleation agent, supercool phenomena of SAT can be effective suppressed. A quick design algorithm based on lumped heat capacity method to evaluate the working time and system parameters of a cooling system using PCM (phase change material) is derived and proposed with detail mathematical formulation. In addition, a PCM capsule concept is proposed to provide a flexible extension of the usage of PCM cooling.

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