Title:
【発明の名称】極低温生成方法
Document Type and Number:
Japanese Patent JPH08512398
Kind Code:
A
Abstract:
PCT No. PCT/FR94/00818 Sec. 371 Date Apr. 17, 1996 Sec. 102(e) Date Apr. 17, 1996 PCT Filed Jul. 4, 1994 PCT Pub. No. WO95/02158 PCT Pub. Date Jan. 19, 1995Temperatures of 0.2 DEG K or lower are achieved by feeding 3He and 4He separately into a mixing chamber (5) in an enclosure (3) in which the temperature is held at around 2 DEG K. The endothermal dilution of 3He into 4He provides the required cold. The resulting mixture (M) passes out of the mixing chamber and the enclosure while cooling the incoming fluids by means of exchangers (1, 12, 4). To compensate for thermal losses, the mixture (M) also undergoes Joule-Thompson expansion (12) optionally followed by evaporation (13), preferably between about 1.5 DEG and 2.5 DEG K, and the resulting cold is used to lower the temperature of the incoming fluids from well above 4 DEG K to between 1.5 DEG and 2.5 DEG K, which is close to the temperature prevailing inside the enclosure (13) containing the coldest point (6) in the circuit.
Inventors:
Benoit, Alan Daniel
Puyol, Serge
Puyol, Serge
Application Number:
JP50385195A
Publication Date:
December 24, 1996
Filing Date:
July 04, 1994
Export Citation:
Assignee:
Center National Despair Spasial
International Classes:
F25B9/12; (IPC1-7): F25B9/12
Attorney, Agent or Firm:
Soga Doteru (6 people outside)