Design and Manufacturing of a Free-Piston Stirling Cooler

• Main Authors: Zhe-YuLu, 呂哲宇
• Other Authors: Chin-Hsiang Cheng
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/bhvrmt

碩士 === 國立成功大學 === 航空太空工程學系 === 104 === This study is aimed at developing a beta type free-piston Stirling cooler and using a voice coil motor as driving source. A theoretical model has been established to predict the dynamic behavior and coefficient of performance of the cooler.The free-piston Stirling cooler is different from traditional Stirling cooler in mechanism. A displacer of the beta type free-piston Stirling cooler is restricted by a planer spring. In order to achieve a low no-load temperature, the theoretical model is developed to assist a design of prototype and experiments. The displacement and velocity of piston and displacer can be obtained by a dynamic model in the theoretical model. Thermodynamic properties in three different chambers are the transient varying positions of a piston and a displacer is obtained by means of the dynamic model. The no-load temperature of the cold head can be obtained by energy equation. The coefficient of performance can be decided as heat load is applied on the cold head. In this study, a prototype cooler using helium as working fluid is developed, which is able to reach the no-load temperature of 153 K at charging pressure of 3 atm and operating frequency of 50 Hz.