Conveners
C3OrD - Regenerators and GM Coolers (Non-Aerospace)
- Milind Atrey (IIT Bombay, Powai)
- Weibo Chen (Creare LLC)
This paper introduces a Software Development Kit (SDK) that enables the creation of custom software applications that automate the control of a cryo-refrigerator (Quantum Design model GA) in third party instruments. The SDK was developed using C# in the .NET framework, utilizing a polymorphic design. It provides an easy to user interface for controlling compressor functions, without the need...
The regenerator is a critical component of all Stirling and Pulse Tube cryocoolers. It generally consists of a microporous metallic or rare-earth filler material contained within a cylindrical shell. The accurate modeling of the hydrodynamic and thermal behavior of different regenerator materials is crucial to the successful design of cryogenic systems. Previous investigations have used...
Large GM cryocoolers (>300W at 80K) have been used for many high temperature superconductors and various other cryogenic devices. This paper presents the improvement of a GM cryocooler, Cryomech model AL600, which has nominal cooling capacity of 600W at 80K. The cooling performance and vibrations of the AL600 cold head have been studied. The cold head seals, regenerator and heat exchanger as...
To improve the efficiency of a cryocooler, an effective way is to improve the efficiency of the regenerator. In general, the heat capacity of materials decreases as temperature decreases. Thus, when temperature is below 40 K, lead or bismuth spheres are often used as a regenerator material. However, the pressure drop in a sphere regenerator is much larger than that in a screen regenerator. To...
Pulse tube refrigerator (PTR) is a type of regenerative gas-cycle refrigerator which operates with oscillating pressure and mass flow gases such as helium, argon, and nitrogen. As the key part of PTR, regenerator works as a heat reservoir in which oscillating gas flow rejects or absorbs heat into or from the solid matrix. A proper description of the flow characteristics and heat transfer of in...
For a multi-stage pulse tube refrigerator, improving the regenerator efficiency is the most important thing. A solid phase-shifter can get higher operating pressure ratio compared with inertance tube. The pressure ratio influence on the performance of the regenerator is discussed. The result shows that for a given regenerator, there is an optimum pressure ratio to get best performance.
