Conveners
C1Or3A: Aerospace Coolers II: JT
- Ian McKinley (JPL, California Institute of Technology)
- Peter Bradley (NIST)
A 4K hybrid JT cooler is developed as an alternative to precool the adiabatic demagnetization refrigerator (ADR) of Hot Universe Baryon Surveyor (HUBS) mission which is proposed to study “missing” baryons in the universe. The 4K hybrid JT cooler is composed a 4He JT cooler precooled by a two-stage thermally coupled pulse tube cooler. Recently, the two-stage pulse tube cooler is optimized to...
NASA is considering a “probe” class mission with a far-infrared imaging and spectroscopy space telescope. A critical technology for this mission is an efficient, high capacity, low-temperature cryocooler with low exported vibrations to enable its cryogenic instruments to achieve exquisite sensitivity and low internal noise to observe far distant faint cosmic sources. This paper compares the...
Miniature Joule-Thomson (JT) cryocoolers are attractive for many applications due to their small size and resulting fast cool-down time. Finned-tube heat exchangers are the most widely used heat exchanger for miniature JT cryocoolers. The basic configuration, known as a Giauque-Hampson (GH) or coiled tube heat exchanger, involves the high-pressure stream flowing through a finned-tube that is...
Open cycle Joule-Thomson (J-T) cryocoolers that operate with pure nitrogen and provide about 1 W of refrigeration effect at 80 K are used extensively in missiles. There is a worldwide interest in developing single-stage miniature J-T cryocoolers that operate with mixtures of refrigerants for cooling detector elements in space applications. Detector cooling enables noise reduction and thereby...
The cell of the sorption compressor developed in this paper has a thin-plate shape to accelerate the pressure swing by reducing the heating and cooling periods. Its width, height and thickness are 100 mm, 100 mm and 4.6 mm, respectively. Two identical cells filled with 22.8 g of charcoal mass are operated alternately to generate and maintain significant pressure difference for the 5 K J-T...
This paper presents initial experimental results of a Modified Collins cycle cryocooler designed for space cooling applications. It describes a high efficiency and lightweight single stage cryocooler design that will provide about 100 W of cooling at temperatures on the order of 90 K. With multi-staging, cooling to 4 K should be possible with this architecture. A single stage machine with a...
