Helium three (He-3) refrigerators capable of reaching 0.3 K in space with liquid helium cryogen cooling stages at approximately 1.8 K were already developed to the point of being tested on sounding rockets. A new design of He-3 refrigerator incorporating an additional closed cycle He-4 stage, which operates with the precooler at 4 K, is described and evaluated for its potential with respect to space applications. The use of such a He-3 refrigerator coupled to a 4 K cryocooler is discussed, with the suggested possibility of long life (several years) microwatt cooling at 0.3 K, for a spacecraft system level cost which is expected to be less than 50 kilograms and 200 Watts of power input.
|Title of host publication||host publication|
|Publication status||Published - Dec 1991|
|Event||4th European Symposium on Space Environmental Control Systems Volume 1 p 403-405 (SEE N92-25828 16-18) - |
Duration: 1 Jan 1824 → …
|Conference||4th European Symposium on Space Environmental Control Systems Volume 1 p 403-405 (SEE N92-25828 16-18)|
|Period||1/01/24 → …|
- CLOSED CYCLES, COOLING SYSTEMS, CRYOGENIC COOLING, HELIUM ISOTOPES, REFRIGERATORS, CRYOGENICS, LIQUID HELIUM, SOUNDING ROCKETS