Refrigeration – Processes – Employing diverse materials or particular material in...
Patent
1995-11-20
1998-01-13
Doerrler, William
Refrigeration
Processes
Employing diverse materials or particular material in...
62 461, 252 67, F17C 1100
Patent
active
057066639
ABSTRACT:
Mixed refrigerants provide refrigeration at cryogenic temperatures with throttling cycles operating with a one-stage compressor. The refrigerants include noncondensable gases such as helium, neon, or hydrogen to increase the overall cooling capacity of a refrigeration system at the same refrigeration temperature which is attainable without such noncondensable gases. More refrigeration can be produced with existing systems at temperatures above the normal boiling point of nitrogen or argon by adding, for example, helium, than for refrigerant blends without helium. By increasing the return pressure value of the refrigeration cycle in relation to the molar percent of helium present in the refrigerant, a constant refrigeration temperature may be maintained which exhibits greater stability than prior systems operating at the same temperature without helium enrichment.
REFERENCES:
patent: 5063747 (1991-11-01), Jones et al.
patent: 5337572 (1994-08-01), Longsworth
R. Longsworth, et al., "80 K Closed Cycle Throttle Refrigerator", International Cryocooler Conf., Jun. 1994.
Boiarski Mikhail
Khatri Ajay N.
Longsworth Ralph C.
Yudin Boris V.
APD Cryogenics Inc.
Doerrler William
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