Cryostat refrigeration system using mixed refrigerants in a closed vapor compression cycle having a fixed flow restrictor
US5579654A · kind A · utility
28Cited by
4References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Jun 29, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/32
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A closed cycle cryogenic refrigerating system with a fixed restrictor operates with a compressor inlet pressure in a range of 0.1 Mpa to 0.4 Mpa and compressor discharge pressure in a range of 1.5 Mpa and 2.5 Mpa. A basic cryogenic refrigerant mixture is used to which is added approximately 3% to 25% of helium, hydrogen and/or neon. A ratio of refrigerant density at the inlet of the fixed restrictor between steady-state operation and operation at the beginning of cool-down is in an approximate range of 7 to 17. Relatively rapid cool-down is achieved and evaporator temperature is maintained in an approximate range of 70K to 120K.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.