Stirling cryocooler has been a critical device in cryogenic applications This thesis is aimed at development of 100-K class Stirling cryocooler by numerical and experimental methods Stirling cryocooler can be divided into linear and rotary types according to their drive mechanism BLDC (Brushless DC) motor can be readily integrated to rotary Stirling cryocooler This study is focused on the rotary cryocooler with both split and integral configurations that may be developed to various applications A theoretical model is firstly built is this thesis to analyze the Stirling cryocoolers with the two configurations Variations of mass pressure and temperature of working gas are evaluated based on the thermodynamic analysis Cold head temperature is the primary object for Stirling cryocooler As a result process of temperature fall of the cold head is prescribed with an energy equation Effects of pressure and temperature on transport properties are considered in present model Influence of cryogenic temperature on solid material is introduce as well The ratio of the actual COP to the Carnot COP is defined to represent the relative performance of Stirling cryocooler On the other hand prototyping of split and integral Stirling cryocooler is accomplished in this thesis Experimental system is constructed for measuring the performance of the cryocoolers For the split configuration prototypes with planar spring and gas spring are demonstrated with 100 K and 103 K no-load temperature A surface permanent magnetic synchronous motor is designed to be integrated with integral Stirling cryocooler No-load temperature of 88 K is achieved at 35-bar charged pressure and 3000-rpm rotation speed Capacity of 0 2 W is acquired from the proposed integral Stirling cryocooler at a temperature of 113 K
Development of 100-K Class Stirling Cryocooler by Numerical and Experimental Methods
振軒, 黃. (Author). 2021
Student thesis: Doctoral Thesis